bluuebunny/crossref_metadata_2025 huggingface dataset:
Capacity Control of Phosphate in Caofeidian Sea Area
Authors: Du Dong , Kuang Cui Ping , Huo Rui , Sun Xiao Ming
Published: June 2011

Caofeidian is a large harbor being constructed in north of China. It is greatly meaningful to investigate the pollution situation of this area. In this paper, firstly, a tidal flow and pollutant transport numerical model based on Delft 3D-FLOW was established and verified by measured data to simulate and analyze phosphate distribution in Caofeidian sea area. Then, phosphate concentration under six hydrological conditions (spring, middle and neap tides of flood season; and spring, middle and neap tides of dry season) was computed by this numerical model, and the comparisons were made between the computed phosphate concentration at the boundary of the mixing zones and corresponding water quality standards. At last, the allowances discharge amount and cut rate of phosphate of each outfall was calculated. The results show that the high phosphate concentration appears the sea area around the river outlets of Douhe and Shahe, and the phosphate concentration of Douhe and Shuanglonghe rivers’ mixing zones exceed their allowed standard values, the total phosphate discharge from these rivers must be cut down.
A Study on the Characteristics of Zeolite-Enhanced Activated Sludge in the A/O Biological Nitrogen Removal Process
Authors: Cheng Guan Wen , Shan Xu , Wu Zhi Chao , Huang Xiang Feng , Zhang Fei Juan
Published: June 2011

This paper mainly studies the use of the activated sludge process with zeolite to upgrade the traditional secondary water treatment plants. With the addition of an appropriate amount of zeolite, the living environment of several micro-organisms in the activated sludge can be improved, thus raising the activity and number of micro-organisms and increasing the level of nitrification. Simultaneously, it also can improve size distribution and structure of sludge particles, the settling property, thus reducing the specific resistance of sludge. However, excess doses of zeolite will increase the viscosity of the sludge, which will reduce the compression performance in sludge thickening. This is not favorable to the operation of the secondary sedimentation tank and the pipeline transport of sludge. Therefore, we suggest the further study of the lower doses of zeolite, to find the optimum effect and eliminate the negative ones.
Gender Differences in Information System Usage: A Case Study
Authors: Lin Su Sui , Fang Kwo Ting
Published: June 2011

To understand information system (IS) or information technology (IT), gender differences are the potentially critical issues. Getting more insights into the differences of gender, case study was applied to explore them in information system usage and then compare the difference between man and woman’s System Influence Diagram (SID). Some findings were explored in this study. First, woman put more emphasis on function of information system, yet man focus on management function in organizations. Second, man thought that user habit and perception interacted with information system design. But user habit was just influenced by system design directly in woman’s SID. Third, there was a feedback loop in woman’s SID associated with management function but no feedback loop in man’s SID.
Tensile Capacity of Post-Installed Rebars in Concrete Structure
Authors: Wang Chi Ping , Wu Sheng Min , Wang Chih Kang , Pan Hong Yu
Published: June 2011

This paper describes an experimental study on the tensile capacity of post-installed rebars setting with adhesive. Eighty-one specimens containing single or double rebars were tested by an extraction tester to investigate the influence of embedment depth, edge distance and spacing of rebars on the tensile behavior of rebar system. The experimental results show that embedment depth is the most significant factor for rebar capacity and failure mode. The edge distance and the spacing effects are more significant only for the rebars with insufficient embedment depth. This study also attempts to evaluate two available design procedures provided by manufacturers. The comparison between the experimental data and predicted values calculated according to the two design procedures shows that both of the design approaches lay on the conservative side.
Integrated Technology Based on Resource and Environment Attributes for Workshop Planning and Production Operation
Authors: Zhang Hua , Zhao Gang , Jiang Zhi Gang , Wang Yan Hong , Xiao Ming
Published: June 2011

In this paper, the integrated technology based on resource and environment attributes is presented for the workshop planning and production operation. Applying this integrated technology, a demonstration workshop of thermoelectrical valve manufacturer has been constructed to meet the demands of enterprise development. On a principle of green planning, the workshop structure and partition function, the devices layout and the scheduling mode aiming at the minimum energy consumption and noise yield are rebuilt on the base of the present manufacturing process and devices in a representative manufacturer. In this research work, the actual production data of the manufacturer is gathered, arranged, formatted and quantified to build a resource and environment attribute database for the conventional manufacturing process. The key of the integrated technology is to model the full life cycle production for the typical products in the workshop. Via the attribute analysis of the resource consumptions and environment impacts, some adaptive processes of green manufacturing and several prototypes of process device are offered for the respective process of the real production in the workshop. The integrated technology for the workshop planning and production operation is entirely realized and an environmental benefit is gained remarkably.
Effects of Mineral Fertilizers and Organic Manure Long-Term Application on Carbon Dioxide Emissions from Black Soils in Harbin, China
Authors: Wang Lian Feng , Qiao Yan Jiao , Zhang Xi Linx
Published: June 2011

Carbon dioxide (CO2) is an important greenhouse gas. CO2emission from different long-term fertilized black soils was investigated by incubation experiment at soil water content of 70% water holding capacity. Maximal CO2flux was observed at the beginning of 24-h and 48-h incubation after the rewetting of dry soil. Combined fertilizer nitrogen (N), phosphorus (P) with manure (M) emitted the highest CO2-C, was up to 175 mg kg-1. Compared to zero fertilization (CK), fertilizers application increased CO2emission (P<0.05). Single fertilization N, P and potassium (K) increased CO2emission 19%, 43% and 22%, respectively. Combined two-way or three-way fertilizer N, P and K also increased CO2emission. Based on mineral fertilization, additional organic manure application furthered CO2emission. Two-way fertilizers (NP, NK and PK) application with organic manure increased CO2emission at the percentage of 398, 13.8 and 29.1, respectively (P<0.05). Although organic manure application ameliorated soil chemical, physical and biological conditions, organic manure fertilization increasing CO2emission should be considered in agricultural practice.
Test of Perforated and Reinforced Steel Skeleton Joints under Low-Cycle Load
Authors: Zhang Hai Yan , Duan Jing , Yu Min
Published: June 2011

Three perforated steel skeleton joints reinforced by a new method were tested under low cyclic load. The results indicated that the perforated steel skeleton and reinforced plate could work together well and the connection by weld all around of the reinforced plate with the perforated steel skeleton was effective. The test results proved the feasibility of the proposed method for the perforation and reinforcement of section steel, which provided a basis to the further study.
Electrochemical Pretreatment of Wastewater from DDNP Production Using BDD Thin Film Electrode
Authors: Fan Rong Gui , Li Chun E , Bai Yong Xin , Huang Da Qing , Fang Liao Wei , Liang Hong Xing , Wang Quan Cheng
Published: June 2011

The electrochemical oxidation of wastewater from DDNP production was investigated using a boron-doped diamond (BDD) thin film electrode. The effects of operating factors such as cell voltage, interelectrode distance and additive NaCl have been studied. This study showed that the chemical oxygen demand (COD) reduction is most influenced by the applied cell voltage. Higher current densities resulting from higher cell voltages increase the formation of oxidative reagents resulting in an increased COD removal rate. The maximum COD removal was 57% after 210 min, with an energy consumption of 14.90 KWh·kg-1COD when cell voltage was 12V, interelectrode distance was 3cm and additive NaCl concentration was 1g·L-1. The use of BDD thin film electrode for the treatment of DDNP production wastewater appears commercially feasible.
Distribution of Heavy Metals in Urban Gully and their Pollution Assessment
Authors: Song Yu Jia , Liu Hui Qing
Published: June 2011

Set 5 sample sections in a certain gully area in the tributary of Iton River from upstream to downstream of Changchun city, which locates in the northern part of China, then respectively collect sediments and soils which are proximal and distal away from the river bank, test the heavy metal content of Zn, Cu, Cd, Pb and conduct pollution assessment. The result shows that: the content of Zn in sediment is in the state of light pollution, Cu has an obvious accumulated tendency, Pb，Cd are basically in a state of local background value. Therefore, the pollution index of sediment is in a state of slightly pollution, the proximal bank-side is in the safe state, while the distal bank-side is in a state of alert. The main reasons that cause heavy metals pollution and accumulation are traffic and agricultural pollutions.
Kinetics on Oxidation of Odor Contaminant-Dimethyl Trisulfide by Potassium Ferrate in Drinking Water
Authors: Hu Shi Fei , Ma Xiao Yan , Wang Hong Yu , Li Jun , Huang Jing , Zhang Yun
Published: June 2011

Metabolites of alga that will induce disgusting odor into drinking water such as geosmin, 2-methylisoborneol and dimethyl trisulfide, etc. attracted more and more scholar’s attention recently. Dimethyl trisulfide was newly noticed to be criminal of some water supply accidents of unpleasant odor in our country and was found removed effectively by oxidation agents. Batch tests were carried out in this research to investigate reaction kinetics of dimethyl trisulfide oxidized by potassium ferrate in water. Results showed that dimethyl trisulfide can be removed by potassium ferrate and the rate of decomposition followed third-order kinetics, the third-order reaction rate constant k= 6.57×10L/ (s·mg).
Adaptive Power Function Based on Data Fitting Method
Authors: Wang Li Ying , Huang Meng , Zhang Wen Yu
Published: June 2011

For the hydropower station in the turbine spiral case pressure measurement of the actual traffic volume issue, a data fitting method with an adaptive power function is proposed, a large number of practical examples of the calculations show that the proposed method can be quitely closer to the actual data and its fitting error has been less than other fitting function. So the method is promising in practice.
Dynamic Energy of Building under Earthquake Excitation Based on FEM
Authors: Li Peng Yun , Huang An Guo , Xia Chun
Published: June 2011

Evaluation on dynamic energy characteristics of building under earthquake excitation with passive friction damper-protected devices based on finite element method (FEM) is actively carried out in this study. The mechanical model of the dampers is first introduced and the dynamic model of building-damper system is proposed. The evaluation criteria of energy responses are developed and applied to the earthquake response mitigation of a real multi-story building incorporated with friction dampers. The results indicate that the earthquake-induced vibration of the building can be substantially suppressed and the proposed energy evaluation criteria can be effectively utilized in the examination on seismic mitigation performance.
Design and Realization of 60kW Fuel Cell Engine
Authors: Ming Hong , Quan Rui
Published: June 2011

Fuel cell is a promising power source for vehicles because of its advantages such as high efficiency, no pollutant of emissions and so on, according to the requirements of fuel cell middle bus powertrain system studied, 60kW automotive fuel cell engine is designed by our group in this paper. Firstly,the structure of the fuel cell engine is analysed, then according to the reliability design requirement, several design measures of the control system are given, then the hardware and software of both the main controller and single cells monitoring system are put forward, to enhance its output dynamic performance in practical operation, the adaptive optimized control strategies based on our experience and simulation results before are also given. Finally, according to the driving cycles, the testing results are presented to proves the good effects of the method adopted, which can provide a guidance to the further study on automotive fuel cell engine of other research organizations.
Atmospheric Quality Assessment Model Based on Immune Clonal Selection Algorithm
Authors: Wang Li Min , Han Xu Ming , Li Ming , Zhang Chi Jun , Zhang Yan Ting
Published: June 2011

The immune clonal selection algorithm is used to optimize the parameters in the formula of S growth curve index in the paper, thus we can obtain an assessment model for atmospheric comprehensive pollution that is suitable to the cases of multi-pollutants. Moreover the proposed assessment model is applied in the field of atmosphere assessment. Experimental results show that the assessment method proposed for atmosphere quality has many advantages such as pellucid principle, physical explication and correct assessment results etc. It is a new effective approach for intelligence theory and technology applied in the field of environment. Therefore it has great potential in the field of assessment the atmospheric quality.
The Negotiation Support System for High-Tech Virtual Enterprise
Authors: Zhai Li Li , Yang Ze Yi , Sun Qin Ying
Published: June 2011

To solve the cooperation-conflict negotiation problems among the members of High-tech Virtual Enterprise (HTVE), High-tech Virtual Enterprise Negotiation Support System (HTVE-NSS) based on RIA architecture is put forward. According to the operation characteristics of High-tech Virtual Enterprise, in this system, the structure of High-tech Virtual Enterprise Negotiation Support System is designed, which consists of the problem processing system, the model base system and remote conference system. And HTVE-NSS adopts artificial intelligence technology to design problem processing system (PPS), and uses UML-Petri net to describe the process of model. The architecture of Negotiation Conference System based on Flex and RIA is designed and Red5 Streaming media server is introduced to support conference interaction, which effectively supports the way to solve the conflict between High-Tech Virtual Enterprises by negotiating.
Sorption Behaviors of Methylene Blue onto γ-Cyclodextrin Polymer
Authors: Li Ning , Xiong Xiao Li , Lin Bing
Published: June 2011

The objective of this study was to convert γ-cyclodextrin to a polymer and further to investigate the potential of using the polymer for the removal of methylene blue (MB) from aqueous solution. The sorption properties of γ-cyclodextrin polymer (γ-CDP) toward MB were investigated. The effects of contact time, sorption temperature and initial MB concentration were discussed. Batch sorption studies and kinetic studies have also been performed to understand the MB extraction ability of the γ-CDP. Results of experiments showed that γ-CDP exhibited some sorption capacities toward MB. It was found that kinetics followed Ho and McKay equation and isotherm fitted Langmuir model. The negative values of free energy change indicted the spontaneous nature of sorption.
Nonlinear Analysis for the Rectangle Axially Loaded Column with CFRP Considering Secondary Load
Authors: Tao Yan , Sun Jun , Liu Zheng , Ma Li Wei
Published: June 2011

This study proposed a method to reinforce existed structures. Nonlinear analysis for the rectangle axially loaded column with CFRP considering secondary load was done by the finite element analysis software ANSYS. The ultimate limit strengthen for seven rectangle axially columns with CFRP which compared with normal axial column respectively (one of them is comparative column no secondary) was estimated under different level secondary loads. This paper mainly investigated the influence of CFRP under secondary load. Coefficient of CFRP was given.
Flexural Strengthening of Reinforced Concrete Beams with Prestressed CFRP Plates
Authors: Deng Lang Ni , Chen Hua , Kang Kan
Published: June 2011

Four medium -scale reinforced concrete beams were constructed and tested to investigate the effectiveness of external poststrengthening with prestressed carbon fiber reinforced polymer (CFRP) plates. The various variables included the strengthening method and the amount of prestressing. The experiments consisted of one control beam, one nonprestressed CFRP-bonded beam, and two prestressed CFRP-bonded beams, all the beams were subjected to four-point bending tests. In comparison to the control beam and the nonprestressed CFRP-bonded beam, the cracking load, yield load, ultimate load and stiffness of the beams with bonded prestressed CFRP plates were increased. The failure mode of the prestressed CFRP-plated beams was not debonding, but concrete crushing. After the debonding of the CFRP plates, the behaviour of the bonded CFRP-plated beams changed to that of unbonded CFRP-plated beams due to the effect of the anchorage system. The ductility of the beams strengthened with CFRP plates having the anchorage system was considered high if the ductility index was above 3.
Research on the Stressed Performance of Polypropylene Fibrous Concrete Ditch
Authors: Zhang Hao Hua , Zhang Ji Ru , Xiong Jie
Published: June 2011

Polypropylene fibrous concrete is a new kind of composite material. Polypropylene fiber leads to an increase in the resisting strength, cracking resistance performance, resistance to impact performance and permeability reducing performance of the concrete, thus reduces the shrinking and deformation of the concrete. This paper uses the method of numerical analysis, assisted by the software of finite element analysis, makes both static and dynamic analysis on the polypropylene fibrous concrete ditch with different volume mixing. It results in the stress and strain table of the head and base plates of the polypropylene fibrous concrete ditch in the case of 0.1%, 0.5%, and 1% volume mixing of polypropylene fibers. The paper provides technological basis for formation design of the polypropylene fibrous concrete materials, and laids technological foundation for the further developments of polypropylene fibrous concrete in hydraulic engineering.
Research on the Mechanical Properties of Concrete Members under Holding Load
Authors: Lu Li Hua , Sun Hai Xia , Chen Si Li , Pan Gui Sheng , Yang Min Ji
Published: June 2011

In order to study the bearing capacity conditions of the reinforced concrete structure in service in the phase of using,test the mechanical properties of the bending members of reinforced concrete structures under loading and not loading conditions,and compare and analyze the relationship of load and deflection, crack, steel strain,concrete face strain under the two conditions,has got the conclusion that the bearing capacity decreased almost 12% under holding load, and analyze the effect of the bearing capacity and deformation under holding load; use ABAQUS finite element to simulate bending members of reinforced concrete structures under holding loading,and the simulation values are very close to the experimental results; indicate that finite element simulation can be carried out in prediction the service life of reinforced concrete structure in practical engineering.
Numerical Analysis of the Bond Performance between CFRP and Steel
Authors: Yang Yong Xin , Huang Yu Ting
Published: June 2011

Adhesively bonded carbon fiber reinforced polymer (CFRP) laminates to the steel structure is a new technology of structure reinforced, which has broad application prospects. Based on the experiment this paper adopt “3D Solid-Spring-Shell element” FE model to analyze how the facts such as the type of FRP ,steel plate and binder, CFRP’s width, steel plate’s thickness effect on the performances like the characteristics of stress distribution, the process of adhesive shear failure and damage characteristics.
Load Bearing Capacity Analysis of Squeezed Branch and Plate Pile under Vertical and Lateral Loads
Authors: Gao Xiao Juan , Sun Yan
Published: June 2011

Considering the initial stress field and concrete damage, no-linearity caused by crack of concrete, non-linear of reinforcement, elastic-plastic of soil around pile, couple interaction between concrete and steel, non-linearity contact of interface between pile and soil, the lateral load bearing capacity of squeezed branch and plate pile under vertical and lateral load is studied with infinite element and finite element couple method. The results indicate that the vertical load decreases the lateral displacement of pile top and increase the pile lateral load bearing capacity at the same time.
Long-Term Performance Prediction of GFRP Bar in Moist Concrete under Sustained Loads
Authors: Huang Jian Wei
Published: June 2011

In this paper, the tensile strength retention of GFRP bars embedded in moist concrete under sustained loads is discussed on the basis of reported data. Long-term performance of GFRP bar is predicted by a newly developed model through time-temperature shift and time extrapolation approaches. Results indicated that higher temperature and longer exposure time result in more tensile strength loss of the sustained GFRP bar in moist concrete. Above certain temperature, GFRP bar in moist concrete with about 20% sustained load fails in rupture of GFRP bar for 75-year design lifetime. The temperature effect shall be taken into account in the design codes/guidelines.
Envelope Response of Corroded RC Circular Columns Strengthened with Hybrid Fiber Reinforced Polymers
Authors: Li Jian Hui , Li Ying , Deng Zong Cai
Published: June 2011

Corroded RC columns do not possess necessary ductility to dissipate seismic energy during a major earthquake, the study investigates the use of hybrid fiber reinforced polymer (FRP) wrapping as a method of retrofitting non-ductile corroded RC columns, and a model to determine the envelope response of RC corroded columns strengthened with hybrid FRP are presented based on cross-section analysis for undamaged RC element. The results show that the technique of strengthening corroded RC column with hybrid FRP is quite effective, the envelope curve estimated using the linear plane assumption with modification by reinforcement slip model, may still be used as the envelope curve of RC corroded columns strengthened with hybrid FRP, a good agreement between analytical and experimental results is observed.
Evaluation of Environmental Vibration Effect in Cement Concrete Pavement Rubblizing by Multiple Head Breaker
Authors: Yan Zong Ling , Li Hai Ping
Published: June 2011

Multiple Head Breaker (MHB) is an innovative cement concrete pavement breaking machine with high impact energy. The impact energy of multiple head propagates in vertical and horizontal direction simultaneously which results the environmental vibration effect consequently. The slope and structures beside the highway are influenced by vibration in rubblizing of cement concrete pavement. But there is a lack of research on environmental vibration effect, such as the influence range, whether there exists destructive effect or not. The characteristics and influence range of ground vibration are analyzed on the base of vibration data acquired by seismograph. The vibration attenuates fast and takes on some traits of concussion and instantaneous vibration. The safe influence range of MHB is associated with characteristic of slope soil. Relationship between vibrancy distance and vertical & horizontal vibration acceleration is established. And the influence range and safe distance are put forward which can provide reasonable parameters for design and construction in rehabilitation of cement concrete pavement.
Remaining Life Prediction of Asphalt Concrete Pavement under Dynamic Load
Authors: Qin Min , Lu Zhao Feng
Published: June 2011

With the theory of M.W.Sayers, the pavement surface roughness was simulated by the sine curve. Through the Mat lab and VC + + program, the dynamic vehicle load caused by pavement surface roughness was analyzed and calculated. Given the dynamic road and environment factors and combined the test results of highway surface roughness, the deterioration law of pavement roughness were studied by amendment Shell permanent deformation theory. A new prediction method was put forward to predict the remaining life of asphalt concrete pavement, which was proved to be reasonable and reliable and can provide a valuable basis for the scientific decision-making of asphalt pavement management.
Characteristics of Different Warm Mix Asphalt Compacted at Low Temperature
Authors: Wang Li Ming , Tan Yi Qiu , Shi Zhen Wu
Published: June 2011

Additives on low temperature compaction and performances of compacted mixtures, the author devised low temperature environment compaction test, and then, comparison tests of volume parameters, high temperature stability, low temperature crack resistance and water sensitivity were conducted. Tests results showed that the wax additives and the surface-active additive can significantly contribute to mixtures low-temperature compactibility. The wax additive helps to improve high temperature stability obviously, and has no significant contribution to low temperature crack resistance and water sensitivity. The surface-active additive directly reduces water sensitivity, the wax additive indirectly plays the role of reducing water sensitivity by increasing the density of mixture, and the foam additive has no obvious effect on the water sensitivity.
Application Study of the Geotextile - Graded Gravel - Geomembrane Composite Drainage Layer in Subgrade Construction
Authors: Liu Yan Yan , Hu Li Qun , Huang Zhong Wen
Published: June 2011

The moisture content of subgrade soil increase will lead to soil strength and modulus decrease, the thesis proposes geotextile - graded gravel - geomembrane composite drainage layer solution, for raw materials in different areas, proposes different composite drainage layer layout scheme, and the technical specifications requirements of raw materials. Test section is constructed, analyses the composite drainage layer construction technology carefully, and humidity sensors are planted in the drainage layer, in which the test data show that: after setting the composite drainage layer, subgrade moisture is less affected by seasonal rainfall, humidity change is always in a lesser extent, water stability of the subgrade is increased significantly.
Effects of Compaction Method and Temperature on Warm Mix Asphalt
Authors: Li Bo , Liu Jian Xun , Su Xiu Li
Published: June 2011

A laboratory investigation was carried out on the volumetric properties of WMA fabricated using the Superpave gyratory compactor (SGC) and the Marshall compactor as a function of compaction temperature. The volumetric properties were obtained and analyzed at the six compaction temperatures 170°C,150°C,130°C,110°C,100°C,90°C. The results show that: Evotherm® can improved the compatibility of the mixtures; Warm Mix Asphalt is sensitivity to the temperature when the compaction method is Marshall; the method of SGC is conducive to dense asphalt pavement for WMA; the best compaction temperature of WMA is not lower than 125°C; the compaction temperature can decreased more than 20°C for WMA comparison with the HMA.
Experimental Study on the Weathered Red Sandstone Soil Road Performance Stabilized with EN-1 Soil Stabilizer
Authors: Huo Jun Shuai , Geng Yi Jun , Yu Zhi Qiang
Published: June 2011

Weathered red sandstone soil has weak water stability, unsatisfactory mechanical and poor engineering properties, which limits its utilization. When the proposing expressway through the soil, a large number of abandoned would be generated, which would burden construction costs and bring about many adverse effects to the local environment. To turn waste into treasure, the improving experiment with EN-1 soil stabilizer was conducted. Through the unconfined compressive strength test, the optimal mixing ratio of EN-1 soil stabilizer was identified as 0.014%. Series of tests on the road performance indexes were carried out under the condition of the optimal ratio of EN-1. The test results showed that 28d strength of the improved soil achieved 2.98MPa, 7d water stability coefficient achieved 0.75, the improved soil possessed good engineering properties, which can meet the requirements of expressway pavement materials.
Numerical Analysis of Joint Opening Displacement for Cement Concrete Pavement under Temperature Gradient
Authors: Li Jing Jing , Wang Zhan Feng , Zhang Qing
Published: June 2011

In order to analyze the changes of joint opening displacement(JOD) for cement concrete pavement under different road structures and material parameters, the joint model is derived and presented. The model takes into account conservation of various factors, the results have shown that JOD is significantly effected by temperature gradient, base modulus, slab length and slab thickness, and then the formula of joint changes have been set up with the consideration of four main factors. According to theoretical results, three different base types about lean concrete, cement stabilized macadam and graded broken stone have on-site observation of JOD for one year in Guangxi, and the above formula is verified, which provides the potential for the joint design and selecting the joint filler.
Study on the Technology of Exposed-Aggregate Roller Compacted Concrete Pavement Used in Tunnels
Authors: Tang Ming , Mu Xiao Bo , Tian Yong
Published: June 2011

According to preparation of noise-reducing concrete with the technology of exposed-aggregate, this paper exploits high performance roller compacted concrete used in tunnels. Based on optimizing proportion, exploiting special exposed-aggregate agent and corollary technology, it is necessary that the high strengthening and the stability in the Course of Using of the exposed-aggregate roller compacted concrete should be further studied. During the study on the properties of strength change of common strength grade exposed-aggregate roller compacted concrete pavement, it found that its strength varied from 38.6MPa to 19.2MPa when the depth of exposed-aggregate reached 3mm.This is the main reason that serious damage occurred in one tunnel pavement which is used less than one year. Consequently, this paper carried out experimental study of high strengthening. Furthermore, this paper have been optimized the parameters of exposed-aggregate roller compacted concrete. And the effect is relatively remarkable.
The Effect of Compaction Temperature on Volume Parameters of Warm Asphalt Mix with Sosabit
Authors: Dou Hui , Li Bo , Ren Wen Hong , Wang Qiang
Published: June 2011

The volume parameters of asphalt mixtures is sensitive to compaction temperature. Warm-mix Asphalt (WMA) was green paving technology, which can allow paving at lower temperature. In this study, a laboratory investigation of the volumetric properties of WMA with Sosabit was carried out by the method of Marshall. And the effect of different asphalt such as modified asphalt such as Kalamay, Shell, SK and Kalamay 90# asphalt on volumetric properties of WMA at different temperature was analyzed. Based on this, the minimum compaction temperatures of WMA with Sosabit was proposed. The result showed that bulk density and VFA are decreasing and air voids and VMA increasing with the decreasing temperature; the volume indicators to meet the regulatory requirements when the temperature is 170°C~143°C for three WMA-SBS temperature and 150°C~115°C for WMA-90#; compaction temperatures of modified asphalt and asphalt mixture after adding Sosabit can lower up to 133°C and 118°C respectively.
Load Stress Analysis of the Impact of Parameters Variation on Super-Thick Cement Concrete Pavement
Authors: Yang Bin , Suo Li Jun , Zhou Chun Ren , Dong Kai Liang
Published: June 2011

With the goal of exploring the impact of pavement structure parameters on load stress of super-thick cement concrete pavement, this paper, based on the Quanxing freeway in Guangxi, analyzes the load stress in the situation of the separated type and combined type contact between the cement concrete slab and the lean concrete base by using three-dimensional finite element model. Computational results show that the variation of different pavement structure parameters have various impacts on the load stress of super-thick cement concrete pavement. The load stress σc1 of super-thick cement concrete pavement slab declines with the increase of slab thickness h1 and base thickness h2 and decreases with the reduction of slab length L and the increases of base modulus E2 and subbase modulus Et. Among them, the variation of slab thickness h1 has the greatest impact on the pavement load stress. Thus, there is a quite obvious effect in reducing the pavement load stress by increasing the slab thickness.
Lattice Slope Foundation-Cantilever Structure Complex Road for the Roadway Widening in Steep-Sloped Mountainous Areas
Authors: Fan Liang , Zhou Zhi Xiang
Published: June 2011

In view of good geological condition non-cliff side slope road widening or new road construction, after contrasting and analyzing the characteristics of widening pattern of roads that have been built, lattice slope foundation cantilever structure complex road is proposed. Using slope foundation column which is casted depending on hillside, its top connect with deck of bridge supporting on the cantilever beam ,thus forms the flank roadway structure. This complex road can avoid deep-digging and high filling, lower construction cost.The construction method is simple, slope is also stable. Moreover, in the course of road widening, vehicle traffic will basically not be affected. In this paper, the method of construction technology, working principles, engineering application and economic, technical efficiency and environmental effectiveness have been analyzed, it shows that in road widening under appropriate condition, this method is safe and reliable, can significantly simplify the process, lower cost, and also maximize the protection of natural ecological environment.
Settlement Control Research of Soft Soil Subgrade Based on Long Qi Bay Project
Authors: Zhang Xiang Dong , Wang Meng , Zhang Xue Lei
Published: June 2011

Jin Zhou Long Qi Bay distributes in different areas of shallow marine sediments, it is necessary to predict and control the settlement of soft soil subgrade. The authors have observed the settlement using the level acquiring horizontal basin maps of vertical settlement and transformed them to ideal horizontal basin maps equivalently and then made a comparision. We have calculated the coefficients of earthwork calculation of settlement reversely. The results have shown that the shapes of the settlement curves of numerical simulation are very similar to those measured, the maximum settlements are very close, which further has shown that stone filled treatment subgrade has received significantly control of settlement and the structure has been significantly strengthened. The reverse calculation of the coefficients has enhanced the applicability of the models which can be adjusted according to the soil of different regions.
Gray Relational Analysis of Graded Gravel Base Asphalt Pavement Structure
Authors: Wang Xiu Shan , Wang Li , Ding Xiao Jun
Published: June 2011

The method to analysis the strength of planetary trains’ carriers of EPB(earth pressure balance) shield machine is presented in this paper. The structure of the shield machine trains is analyzed and the 3-D solid model of the carrier is built with Pro/E. After the load on the carrier has been dealt with, the strength of carrier is calculated by means of finite element method. The results via ANSYS show that the max stress and strain on the carriers are increasing as the increasing load on it. The max stress is lying on the joint point of the carrier and planetary gear shaft because of the bending deformation of the shaft.
Pavement Performance of Cold Recycling Sulphur Asphalt Mixture with Emulsified Asphalt
Authors: Yu Hai Chen , Sun Li Jun , Liu Li Ping , Jia Lu
Published: June 2011

In order to investigate the pavement performance of cold recycling sulphur asphalt mixture with emulsified asphalt, freezing and thawing test, rutting test,shear test,bending test, fatigue test and compression test were carried out.Results showed emulsified asphalt cold recycling sulfur asphalt mixture possessed an excellent high temperature stability, as RAP content increased,the splitting and compressive strength,shear strength,compressive modulus of resilience,low temperature crack resistance,fatigue performance all gradually reduced.When sulphur content of asphalt mixture RAP is less than 70%, cold recycling sulfur asphalt mixture can meet the demand of road base; when the sulphur content of asphalt mixture RAP is less than 50%, the mixture can meet the demand of the bottom layer of asphalt pavement.
The Application of Geogrid in Highway Widening Project of Zhangzhou Coastal Main Artery
Authors: Meng Yun Wei , Chai He Jun
Published: June 2011

Associating with highway widening project of Zhangzhou coastal main artery, the numerical analysis is carried out to analyze the lateral displacement, settlement and soil stress distribution of high fill embankment using geogrid. The results show that using geogrid can reduce the settlement and uneven displacement of high fill embankment. The maximum displacement occurs at the intersection position between old and new embankments, especially the geogrid embedding position. After the geogrid is used, vertical settlement significantly reduced while lateral displacement is in the highest flight. The lateral displacement is nearly 6cm and the total displacement is nearly 7cm, and both values are acceptable in filling construction. Meanwhile, the numerical analysis result manifests that the stress distribution of high fill embankment tends to uniform and then the whole stability of embankment increases. These conclusions may be useful to the design and analysis of reinforced-embankment of high fill and interface between new and old embankments in widened embankment.
Evaluation and Improvement of Asphalt Mixture’s Performance at Low Temperature
Authors: Zhong Yong Qiang , Huang Xiao Ming , Liao Gong Yun
Published: June 2011

In order to evaluate and improve the performance of asphalt mixture at low temperature, low-temperature bending test of asphalt mixture was done at first. It was shown that flexural-tensile strength and flexural-tensile strain of different oil-stone ratios reduced under freeze-thaw condition compared to no freeze-thaw condition. The maximum decay rate of flexural-tensile strength is about 18.97% and the maximum decay rate of flexural-tensile strain is about 6.59%. Then six types of polyester fiber were added to asphalt mixture and bending test at low temperature was done. Through the experiment results comparison of fiber asphalt mixtures, it is found that ultimate flexural strain of Good Road II fiber asphalt mixture increases the largest which is up to 12.95%. Ultimate flexural strain of Dolanit AS fiber asphalt mixture increases 8.67% and other fiber asphalt mixtures increase from 3% to 6%. Fiber bridging and fiber micro-reinforced role in the mixture improves the performance of asphalt mixture at low temperature.
Research Situation of the Unilateral Contact Buckling of Thin Wall Steel-Concrete Composite Panels
Authors: Xia Bing Qing , Dong Jun , Zong Lan
Published: June 2011

Thin wall steel-concrete composite wall panels can be used as bearing member and also as maintenance structural plates, which can satisfy functional requirements of building including bearing capacity, heat insulation and preservation. The problem relating unilateral contact buckling of thin wall steel composite panels has received attention from many construction engineers. The investigation progress is analyzed in general and the investigation questions are illustrated. The research approach and technical routes of delaminated critical load are also presented.
Approach to Set Stresses Field of Flexible Pavements
Authors: Wang Bao Liang , Li Hong Tao
Published: June 2011

Flexible pavements, as one of engineering subject, its stresses field is foundation and take play an important role to its mechanics analysis, life prediction, damage evaluation, and performance estimation. Simple expression of stresses filed in flexible pavement at special conditions (configurations of pavement, material properties, and traffic loading) is given in this research. The work is done by use of numerical analytical methods what 3D finite-element method and function fitting technology. The applicability of the proposed approach is verified using Boussinesq’s solution of semi-infinite elastic solid.
The Analysis and Application Progress of Construction Formwork
Authors: Wang Bao Min , Song Kai
Published: June 2011

Construction formwork is a new type of building material, bringing innovation to building technology aspects such as design theory and construction technology. A summary has been made by combining the research results of the author, the analysis and utilization progress of construction formwork in the aspects of product types, mechanisms of action, construction technology, combined with designing, insulation properties, mechanics and durability, analyzing the key problems that exist during research and application. The comparison of construction formwork walls and traditional walls has shown the application prospects of construction formwork.
Conformal Mapping-Based Approach for Transformation of Vehicle Loads
Authors: Shao Yu Li , Li Yan Xiao , Wang Bao Liang
Published: June 2011

For complex pavements, there are circular, elliptic and rectangular shape vehicle loads under different conditions. Treatment way of vehicle loads is studied with conformal mapping method in this paper. Approach for transformation them to uniform circular shape is also researched. Terminal goal is enable the road engineers to accommodate changes of vehicle loads in their used way to pavement design which using static loads with uniform vertical pressure distribution without any more attached difficult.
Influence of Aging on Viscoelastic Response of Asphalt Mixture
Authors: Li Pei Long , Ding Zhan , Zhang Zheng Qi
Published: June 2011

Two gradations of asphalt mixtures were conducted to short term and long term aging tests. And then, static creep test was implemented on the samples of mixture. According to creep compliance curves from the stress-strain relations, Burgers viscoelastic model parameters were got to analyze the influences of aging effect on the viscoelastic response of asphalt mixture. The results and analysis indicated that aging is an important reason introducing viscoelasticity changes of asphalt mixture. For aged asphalt mixtures, the stiffness increases, the flexibility declines, the instantaneous elastic and the viscous compliance decrease. But short-term aging and long-term aging have different effects. And the viscoelastic parameters of the asphalt mixture with large voids vary more significantly, so aging process is much faster.
Load and Resistance Factors for Progressive Collapse Resistance Design of Reinforced Concrete Building Structures
Authors: Wang Ying , Lin Feng , Gu Xiang Lin
Published: June 2011

Due to the absence of provision for the load and resistance factors in design codes in China, designers often quote the provisions which are given in criterion or guidance of other countries such as USA. However, the partial safety factors of the load are various in different criterions. Based on the reliability theory, the load and resistance factors for progressive collapse resistance design of building structures were determined in this study. Firstly the simplified format of design expression in the ultimate state was obtained according to the expression in routine structural design. Then the failure probability of a structure during design reference period was taken as the sum of the probability of all incompatible failure events in this period, and the objective reliability index of the structure could be obtained. Finally using trial-and-error procedure and JC method, reliability analysis was performed for structural members to obtain the partial safety factors of load effects and resistance and the coefficient for combination value of load effects in design expression in the ultimate state. In this paper the load and resistance factors for progressive collapse resistance design of reinforced concrete structures subjected to blast was calculated as an example, and the recommendation values were given for the application at last.
Pavement Performance Research on Fine Volcanic Ash Modified Asphalt Mastic and Mixture
Authors: Chen Zhi Guo , Chen Zi Ning , Wu Jian Tao , Yao Hai Chen
Published: June 2011

In this paper, based on advanced test methods such as laser particle sizer, scanning electron microscope, DSR and BBR,studies on physical properties of fine volcanic ash are carried out and the effect of single and composite modification on asphalt mastics and concrete by fine volcanic ash are also studied. Cost-effective of asphalt concrete modified by fine volcanic ash are analyzed as well. Results indicated fine volcanic ash can be qualified as a filler modifier for asphalt mixture and it significantly improves asphalt pavement performance and reduces project cost. Fine volcanic ash has favorable social and economic benefits and a broad application prospect.
Study on the Mechanism of the Landslide of Heda Expressway K377
Authors: Nie Lei , Zhang Min , Jian He Qing
Published: June 2011

During the construction of Heda expressway, the Ermi landslide, which occurred on section K377, has interrupted the construction of the expressway. Additional engineering geological investigation became necessary. The direct economic losses are over 3 million US dollars. This paper analyzed the Ermi landslide from the aspects of formation process, engineering geological conditions, the structural characteristics and stability analysis of the landslide. The results show that the formation of the Ermi landslide is mainly due to geological conditions in project area. Because the structure of the sliding body is loose and some weak interlayer exists in the slope, the shear strength of the sliding surface and sliding body is low. As cut-slope excavating, the resistant of the slope body reduced. Eventually the slope lost its stability and a landslide formed. In the stability analysis of the slope, the shear strength parameters of the sliding surface was determined by anti-analysis. Therefore, the result of the evaluation is closer to the actual conditions. Analyzing the stability of the three sliding surfaces respectively, the stability factors for initial slope are between 1.211 and 1.468, and the stability factors for current slope are between 0.958 and 1.076. Hence, the cut-slope excavation is the direct cause of the landslide.