bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Aging on the High-Temperature Rheological Properties of SBS Modified Asphalt
Authors: Li Ning Li , Zhao Xin Po , Li Tie Hu , Pei Jian Zhong
Published: December 2010

the aging existing in use and construction of bituminous pavement will directly resulting in shortening of the pavement’s service life. It is provide the theoretical basis of the design and construction of the SBS modified asphalt mixture to analyze the influence of aging to the rheological property of SBS modified asphalt under high temperature. The testing for the rheological property of three kinds SBS modified asphalt under high temperature has been finished before and after the aging in construction by Brookfield DV Ⅱ+ type of rotation viscometer. The results indicated that viscosity will be increased and the sensitivity of SBS modified asphalt to viscosity will also be lowered along with increase of aging degree. The testing for the rheological property of three kinds of SBS modified asphalt has been finished before and after aging in usage period by the dynamic shear rheometer (DSR). The results shown that G* will be continually increased along with increase of aging degree and this is consistent with change of base asphalt. And this shown that the increase of G* can only come down to oxidation and aging of base asphalt contained in the modified asphalt and also, asphaltene in SBS modified asphalt will be changing in the mode same with that of base asphalt.
Study Influence of Groundwater Seepage on the Deep Foundation Pit
Authors: Gao Hong Mei , Zhao Yan Lin , Zhao Ji Tao
Published: December 2010

Consideration of influence of the groundwater seepage and supporting measures to deep-foundation pit,the deformation characteristics of surrounding soil of the foundation pit are given. Seepage and deformation characteristics of surrounding soil are simulated to predict deformation of the deep foundation in ha er bing and stability of deep-foundation pit is analyzed base on the influence of the seepage. The analysis results are compared with observed data and it is showed that the calculated results with the model considering coupling response of permeability coefficient are closer to observed value than those results with the other model. So, the model considering fully coupling response of permeability coefficient is reliable and applicable.
Insulation Materials Selection for Passive Evaporative Cooling Roof in Buildings
Authors: Yang Wan Sheng , Guo Kai Hua
Published: December 2010

The passive evaporative cooling roof in building is an important passive thermal insulation technology with the development of green roof, spraying water roof and storing water roof. For its complexity of heat and moisture transfer process only some sample experiments could be done on some controlling conditions. In this paper on the basis of analyzing the unsteady heat transfer model with the first boundary conditions and by using the integral method based on the concept of thermal boundary layer the critical penetration time, the critical penetration thickness and the temperature attenuation ratio are calculated and analyzed for different materials with different thickness. The research results show that the critical penetration time is gradually attenuated with the increasing of thermal diffusivity. The critical penetration time of being researched materials is lower than one hour when the thickness of materials is 0.1 meter, when the thickness of materials is 0.2 meter the critical penetration time is between 46.83 and 214.55 minutes, when the thickness is 0.3 meter the time is between 105.36 and 482.73 minutes. The sandy soil has the maximal critical penetration time and the critical penetration thickness in all analyzed materials, and the loose sawdust has the minimum critical penetration time and the maximal critical penetration thickness. On the side of temperature attenuation ratio the different material thickness has different attenuation law.
Application of Non-Destructive Technology in Evaluating Concrete to Sulfate Attack
Authors: Tang Xu Guang , Xie You Jun , Long Guang Cheng
Published: December 2010

The deterioration on sulfate attack was investigated both in physical crystallization and the chemical erosion. Specimens that suffered long-term immersion and dry-wet cycles in saturated sodium sulfate solution are compared to trace the physical attack. And the chemical erosion was conducted by comparing specimens which have been suffered long-term immersion in saturated sodium sulfate solution and saturated limestone solution. In the investigation, the non-destructive detecting indexes, such as the ultrasonic velocity, and the dynamic modulus of elasticity were measured. The permeability, the porosity and mechanical strength at 28-day age were measured. The flexural/compressive strength was measured after 90 wet-dry cycles. And then all the specimens were cut into cubes to take the measure of compressive strength. Based on the experiments, feasibility of various parameters, such permeability, relative dynamic modulus of elasticity, ultrasonic velocity and relative flexural/compressive strength, were investigated to evaluate the concrete deterioration. The results indicate that there is a close relationship between the deterioration by sulfate attack and concrete permeability, so the reduction of permeability is effective in promoting the resistance. The index of the resistance expressed by the dynamic modulus of elasticity ratio is comparable to that expressed by the relative flexural strength. A novel method was suggested in evaluating concrete by sulfate attack, namely, combined with some mechanical tests, the parameter of relative dynamic modulus of elasticity can be used to evaluate the deterioration; the permeability denoted as the amount of transporting charges within 6 hours can be used to evaluate the properties to sulfate attack.
Effects of Temperature and Strain-Rate on the Compressive Strength of Concrete
Authors: Liu Chuan Xiong , Li Yu Long
Published: December 2010

Dynamic compressive tests were carried out for concrete specimens after exposure to temperatures 23°C, 400°C, 600°C and 800°C by using Split Hopkinson Pressure Bar(SHPB) apparatus. Cylindrical specimens with 98mm in diameter and 49mm in length were used in tests. The strain rates achieved in tests ranged from 30s-1 to 220s-1. The results showed that the compressive strength increases with increasing strain-rate, but decreases with the increase of temperature. However, the effect of strain-rate on improving the compressive strength of concrete decreases with the increase of temperature. Moreover, the strain-rate has an improvement on the peak strain of concrete, and the accretion rate increases with increasing temperature.
Anti-Freezing through Drainage Ensured by Heating with Double Thermal Resources for Construction Joints of Tunnels in Cold Area
Authors: Wu Yi Min
Published: December 2010

A new anti-freezing method for construction joints in tunnels is put forward through effective drainage ensured by heating with warm air or ribbon heater. The heating system is intelligently controlled according to the monitoring and analysis of the surface temperature of the secondary lining. This method is characterized as the following: (1) preventing leakage without pressure increase is realized through effective drainage at the back of secondary lining with special drainable channels; (2) alternative heating resources including warm air and electrical energy are offered to heat the region around construction joints, which can prevent the drainable channels from freezing and jamming; (3) for efficient and economy purpose, heating can be carried discontinuously as well as partly at circumferential and longitudinal direction. Numerical simulations validate the availability of heating method for anti-freezing.
FEM Analysis on Failure of Buried Pipelines Conveying Fluid Crossing Fault
Authors: Song Xiao Sheng , Zhu Qing Jie
Published: December 2010

This paper analyzes the interface problems of underground pipelines including pipe-soil contact interface and fluid-solid coupled interaction using finite element analysis software ADINA. In this analyzing work, the influence of site, fault and characteristics of pipelines are comprehensively considered. Then some key parameters greatly affect the failure of pipelines are present and some suggested countermeasures are put forward.
Multi-Criteria Fuzzy Optimization Model of Open-Sea Oil Terminal's Layout
Authors: Tang Guo Lei , Song Xiang Qun , Wang Wen Yuan , Guo Zi Jian
Published: December 2010

The open-sea terminals are in bad natural conditions which cause mooring line failure and sudden vessel movement. Such an accident can lead to costly damage to cargo handling equipment or other nearby vessels and structures, oil pollution. Therefore, this paper proposes a multi-criteria fuzzy optimization model of open-sea oil terminal's layout. The model is to improve port operations and safety by considering line tensions and theirs non-uniformity coefficients, and vessel motions as criteria. Finally, its application of optimizing the layout of open-sea oil terminal is also given, and the results show that the proposed model is applicable in structural optimization.
The Safety Assessment of Buildings Based on Integrated AHP and Fuzzy Comprehensive Evaluation
Authors: Li Hui Min , Zhong Xing Run , Jiao Xia , Xiao Tan
Published: December 2010

To effectively evaluate the safety of houses and buildings, and its owners, users and managers in the usage and management of the process to provide guidance, establish the detailed impact of the third-level buildings safety evaluation index system. Based on the fuzzy theory, used AHP to determine the weight of each index and establish a housing building security fuzzy comprehensive evaluation model. Use this model to execute the security of a middle school as an example and the results shows that the evaluation method is feasible, scientific and reasonable.
Subsidence Monitoring Model of AR and Kalman Hybrid Algorithm and its Application
Authors: Wang Tie Sheng , Zhang Bing , Ma Kai Feng
Published: December 2010

The non-stationary time series data are dealt with the hybrid algorithm modal which combining the combined kalman and AR algorithm, and the modal was build, which the parameters stochastic variance of the AR modal was set in the state equations instead of extracting the tendency items from original data in conventional AR modals, and measure equations were constructed by observation data, then the AR modal can be solved by the Kalman algorithm. The deformation prediction results of the modal used in underground tunnel construction showed that this method was accuracy and feasible.
Experimental Study on Mechanical Properties of Rock Pile
Authors: Huang Ming Kui , Yang Xi Wu
Published: December 2010

Rock pile is a typical kind of adverse engineering geologic phenomenon in mountainous engineering construction. In this paper, the Shui-ma(from Shuifu to Maliu Bay) expressway subgrade of rock pile in Yunnan Province is analyzed, and the mechanical properties of the rock pile are studied through indoor experiments. The results indicate that the main factor determining the engineering properties of rock pile is the particle composition, while the most influencing factor is the content of coarse particles. The relevant results can provide reference to engineering properties study of rock pile for other place.
Generic Model for Energy Carbon Emission of Building Materials
Authors: Liu Meng , Li Yong Qiang , Zhan Xiang
Published: December 2010

To establish an analytic model for carbon emission of building lifecycle, based on life cycle theory, a generic model for energy carbon emission of building materials was proposed. With the model, building materials were classified into several categories, such as cement, steel etc. Furthermore, some product from each category, such as PS325 in cement, was selected as a benchmark of this category. And then product coefficient and region coefficient were induced to express the differences in products and regions or manufacturers. With the proposed model, generic models for cement and steel were established. And it is found that energy carbon emission intensity of steel is around 30~40 times than that of cement. Energy carbon emission of PI525 and PO425 are 51% and 34% more than that of PS325, respectively. Carbon emission of large-scale steel and cold rolling strip is the most emitter in steel products.
Application of Sanming Steel Slag Powder in Cement and Concrete
Authors: Zhang Dong Mei , Lu Ming Shi , Liu Feng Xing
Published: December 2010

Effects of steel slag powder on properties of cement and concrete are investigated. Results show that with the increase of steel slag power, water requirement of normal consistency is decreased, and the setting times are prolonged. The early mortar strength is lower, but late strength rate of increase is great. Steel slag powder is compatible with blast furnace slag. Moreover，concrete，which has harmonious development strength and excellent workability can be obtained by mineral additives two-element compounding.
Thermal Degradation of Flame Retardant Cotton Cellulose
Authors: Gao Ming , Wu Fa Chao
Published: December 2010

Cellulose treated with flame retardant was studied by thermogravimetry (TG), differential thermal analysis (DTA), limiting oxygen index (LOI) and IR. The kinetic parameters for the thermal degradation are obtained following the method of Broido. For the flame retardant cellulose, the activation energy and decomposition temperature were much decreased while char yield and LOI were increased. The main thermal decomposition of the samples with higher LOI occurs at lower temperatures, while that with lower LOI occurs at higher temperatures.
Back-Propagation Model for Nanofiltration Process Simulation in Pesticide Wastewater Treatment
Authors: Yang Qing , Hu Yong Ju , Xue Liang
Published: December 2010

This study simulated the nanofiltration (NF) process of contamination removing by back-propagation neural network (BPNN), according to the test values of DK membrane pre-treating Imidacloprid pesticide wastewater. The real time nanofiltration (NF) separation model was presented for effective controlling of DK NF separation. The research showed the simulation precision met the application demands, with the correlation coefficient between the simulation and test rejection of COD and salt over 0.99, and absoluteness error below ±4%. In order to test the prediction of this BPNN simulation model, further NF experiments were carried out. Under the same multifactor condition, the predictions for the NF process performances were found to be in good agreement with the experimental results. This BP simulation model for NF process could be used to test the stability and effectively of NF system, and support the membrane technology well.
The Internal Forces and Deflection of a Simply-Supported Hip-Truncated Combined Parabolical Cylinder Roof
Authors: Sun Ai Liang
Published: December 2010

The equation of the middle surface of a simply-supporteded hip-truncated combined parabolical cylinder roof is established by means of the local inclined coordinate system and step function. Then, the formulas of the internal forces and deflection of a simply-supporteded hip-truncated combined parabolical cylinder roof are derived from the theory of shells and variational method. Finally an illustrative example of this roof is presented. This example indicates that the stress and deflection of this roof are much less than those of the hip-truncated four pitch roof of the same dimensions while its rigidity is much larger, so materials will be saved by use of such a proposed roof.
Experimental Study on High Performance Ceramsite Using Yongjiang River Site
Authors: Liu Jun Zhe , Zhou Hai Hua , He Zhi Min , Zhang Zhen Wen
Published: December 2010

In this paper, using river silt from Ningbo as main material, through studying the properties and mixture ratio of raw material and sintering parameters, successfully sintered high mixing volume of silt, large range of sintering temperature, low-water-absorption and high-strength lightweight aggregates, and analyzed its microstructure, providing a better way of resourcization for the Yongjiang silt. The results show that Yongjiang silt supplemented with fly ash and other supplementary materials can be sintered high performance ceramsite, lightweight high-strength low water absorption ceramisite is because the ceramsite has dense enamel structure on surface and honeycomb closed fine porous structure in internal.
Influence of High-silicon Limestone on Mineral Structure and Performance of Belite-Barium Calcium Sulphoaluminate Clinker
Authors: Zhao Pi Qi , Lu Ling Chao , Wang Shou De
Published: December 2010

The mineral structure and performance of belite-barium calcium sulphoaluminate cement clinker were investigated by petrographic analysis, X-ray diffraction and scanning electron microscopy, while raw materials were studied by differential thermal analysis, thermogravimetric analysis and X-ray diffraction. The results show that high-silicon limestone has low decomposition temperature which can promote the development of alite by adding small quantity. The formation and development of C3S is hindered in α-quartz while C3S is formed easily by mixing magnesite and dolomite in the low temperature. The proper proportions of high-silicon limestone and ordinary limestone is 1:5, and the compressive of this cement at 3, 7, 28 d are 37.9, 60.3, 87.9 MPa, which shows excellent mechanical properties.
Effect of MgO on the Composition, Structure and Properties of Alite-Calcium Strontium Sulphoaluminate Cement
Authors: Yin Chao Nan , Lu Ling Chao , Wang Shou De , Chen Ya Ming
Published: December 2010

The influence of MgO on the composition, structure and properties of alite-calcium strontium sulphoaluminate cement were investigated by means of X-ray diffraction, SEM–EDS and light analysis. The results show that when the mass fraction of MgO is 1~5%, the early strength of cement can be enhanced significantly. The optimal content of MgO in the cement clinker is 2% and the compressive strengths of the cement at 3, 28 d are 64.3, 103.6 MPa respectively. A suitable amount of MgO can promote the formation of C1.5Sr2.5A3 , while the formation of C1.5Sr2.5A3 can be hindered if the content of MgO is excessive. The existence of MgO can improve the formation of C3S, increasing the mechanical property of the cement. Compared with the Portland cement, alite-calcium strontium sulphoaluminate cement has a higher capacity to dissolve MgO, which indicates that low-quality high-magnesium limestone can be efficiently used in the cement production.
Mechanism of High-strength Concrete Damage Evolution Based on CT Observation
Authors: Zhang Hui , Yang Ren Shu , Zhao Ling , Cao Hui
Published: December 2010

To study damage evolution of high-strength concrete under the frozen environment, based on the background of YunCheng auxiliary shaft engineering, this paper studies the damage pattern of C100 concrete under loading by applying the method of industry CT scanning. It aims at showing the evolution process of concrete damage by contrasting of the damage factor on standard curing and negative temperature curing condition, which analyzes the trend of damage modulus of elasticity of C100 high-strength concrete uniaxial compression conditioned from the micro level, combining change of fractal dimension of concrete. The results showed that the change of fractal dimension can reflect the evolution trend of inner damage of concrete, fractal dimension is related with the size of concrete when it damaged. Negative temperature frozen brings about the increase of inner hole of high-strength concrete and decrease of modulus of elasticity, and the ratio of damage energy release rate and strain energy release rate decrease, the energy needed by concrete damage is very low. Moreover, the nonlinear positive correlation between fractal dimension and damage factor of high-strength concrete has been gained.
Preparation of Cement Water Reducer of Modified Lignosulfonate
Authors: Wu Xiu Wen , Zhang Heng
Published: December 2010

In this paper, the cement water reduction agent from modified lignosulfonate was synthesizd using a new process consisting of pre-oxidation, hydroxymethylation and sulfonation. The optimum synthesis conditions were identified: the oxidizing agent dosage is 15%, reaction temperature is 80-90oC, the dosage of formaldehyde is 30%, reaction temperature is about 95oC, pH is about 9.5. Fluidity of cement paste can be measured under the conditions of the addition of 0.25%, and the water-cement ratio is 0.4%. The results showed the modified lignosulfonate prepared under the above conditions had the better slushing performance. The fluidity of cement paste can reach 178 mm that is close to the high efficiency water reduction agent requirements.
Non-Linear Elastic Incremental Constitutive Model for Confined Concrete
Authors: Jin Xi Nan , Gao Jian Ping , Pan Jing Long
Published: December 2010

This study offers a new isotropic non-linear elastic incremental constitutive model for concentrically loaded specimens based on non-linear elasticity theory, according to the test results of 18 concrete stub columns wrapped with different amount of carbon fiber reinforced plastics(CFRP), glass fiber reinforced plastics(GFRP), steel ring, FRP-steel ring, respectively. The mechanical proprieties of concrete stub columns with circular cross section wrapped with any material under uniaxial loading can be analyzed according to the proposed constitutive model, the failure criterion of concrete in complex stress state, and the ultimate tensile strain of wrapping materials. The calculated results are in good agreement with the measured results.
Study on Bonding Capacity of Different Assemble Patterns of Wood Species in Structural Lumber
Authors: Zhou Xian Yan , Li Jing Hao , Zhang Zhong Feng , Peng Wan Xi
Published: December 2010

This thesis aims to select the optimal assemble patterns of wood species for structural lumber for wood-based bridge by analysing the bonding strength of eucalyptus veneers, poplar veneers and bamboo mats. Through variance analysis, the experiment results showed that: the compound mode: bamboo mat was used as the core panel, eucalyptus veneers as the surface panel, and the bonding strength is above the national standard. What draws special attention was that thickness of eucalyptus veneers was above 1.3 mm to crack.
Study on the Influence of Air-Entraining Agent on the Impermeability of Cement-Based Composites Based on its Pore Structure by Fractal Theory
Authors: Du Zhi Qin , Sun Wei
Published: December 2010

The effect of different quantity of air-entraining agent on the impermeability of cement-based materials are studied in this paper. Impermeability test and mercury intrusion porosimetry (MIP) method were used to characterize the impermeability and pore structures. The fractal dimension is used to describe the characteristic of pore structure and calculated by the data of MIP experiment. The result shows that owing to the improvement of pore structure, the impermeability performance of the cement-based composites is noticeably enhanced when air-entraining agent is added with appropriate quantity.
Analytical Solution and Engineering Application of the Inclined Rectangle Plate under Longitudinal and Lateral Load
Authors: Zhang Jia Fan
Published: December 2010

To the inclined rectangle plate subjected to forces acting longitudinally and laterally, the analytical solution of deflection, stress and inner force, considering the influence of inner force in central surface on the bending of the plate, were given by using the theory of plate and energy method. In accordance with the characteristics of structural form of rock layers in horizontal section top coal sublevel caving for the mining steep seam, deflected deformation rules of the roof and evolution path along influencing factors were discussed, the critical technical parameter of horizontal section top coal sublevel caving was got, and engineering technique measures to control strata movement were given. It is shown that, the deflected deformation and inner force are related to plate material, geometrical properties and inclined angle of the plate with obvious nonlinear properties. Then the reasonable range of horizontal section altitude of top coal sublevel caving is between 20m and 30m. The severest area of strata movement is in the central of mined-out area along mining, the upper part of subsidence area must be filled to reduce the length of hanging roof and retard the movement of overlying strata, further control the ground subsidence.
Strength Properties of Activated Hwangtoh Mortars
Authors: Oh Dongsik , Song Doheom , Go Seongseok
Published: December 2010

Hwangtoh (loess) has pozzolanic properties that mean it can be used as a cement admixture when activated at high temperatures, and that it can be used in combination with building materials such as fly ash or blast furnace slag. This study aimed to analyze the relationship between the compressive strength and the brick bond strength of various mortars containing hwangtoh, and also to find the optimum mixing conditions for the use of hwangtoh. It was found that the mortars’ strength properties are significantly influenced by the water/cement ratio W/C and the activated hwangtoh substitution ratio. We recommend the following materials and mixing conditions: W/C 60%, a cement substitution ratio of activated hwangtoh of 20 ~ 25%, and the addition of 10% blast furnace slag to improve the compressive strength of such mortars.
Application of Rock Bolt Foundation in the Design of Metallurgical Industry Factory Building
Authors: Liu Hong Bin
Published: December 2010

Metallurgical industry factory building is usually high. Under the action of wind load and horizontal crane force, large moment will be induced at the column base. That is to say, the moment acting on the foundation is large. The embedded depth is relatively deep and the size of factory building foundation is relatively big. In the case of foundations based on the natural rock, if the routine design code adopted, the high capacity of the rock can not be fully utilized. The use of bolt at the bottom surface of the foundation integrates the foundation and the natural rock, hence reduces the foundation size and embedded depth to save the investment.
Volume Change of Limestone and its Effects on Drying Shrinkage of Concrete
Authors: Yagi Shogo , Aquino Carlos , Inoue Masumi , Okamoto Takahisa
Published: December 2010

Recently, the cracks of concrete by drying shrinkage become one of the problems in the construction industry in Japan. The drying shrinkage decreases when the concrete is produced with limestone aggregate. However, it is not clear why the drying shrinkage is decreased. The purpose of this study is to clarify the relation between the drying shrinkage of concrete and the limestone aggregate. In this study, the experiments about the strength, elasticity and drying shrinkage of concrete and the physical properties and shrinkage of coarse aggregates were conducted. It is thought that the volume change of aggregates affects directly the drying shrinkage in concrete.
Microstructural Characterizations of Ultra-High Strength Steel Bars
Authors: Chen Meng Yang , Hwuang Bo Ming , Yang Jer Ren
Published: December 2010

Steel bars used in high-rising building were developed by the addition of V and Nb in medium carbon steels. In this study, two steel bars with different diameters (16 mm and 36 mm) were analyzed via optical and transmission electron microscopy (OM and TEM)., the microstructures of the steels studuied consist of ferrite and pearlite the same as those of the conventional steel bars, but they possess higher yield strengths (over 685 MPa) in combination of considerable elongations (above 10%). The results of transmission electron microscopy reveals that the copious nano-sized (about 20 nm) carbides were interphase-precipitated in ferrite and that the inter-lamellar spacings of pearlite were extra fine, about with a scale of 100 nm. It has been estimated that the small carbides and fine pearlite provide yield strengths, approximately 300 MPa and 800 MPa, respectively. In addition, the volume fraction of ferrite was up to 40%, which offered sufficient soft phase to experience external stress. The results of tensile tests for the steels studied demonstrat that the amount of strain can be up to 1.4% as a yield stress is reached, and the apparent yield point and plateau are present in the stress-strain curves.
Influence of Seed Crystal and Modifier on the Morphology of α-calcium Sulfate Hemihydrate Prepared by Salt Solution Method in Pilot Scale
Authors: Kong Bao , Guan Bao Hong , Yang Liu Chun
Published: December 2010

Preparation of α-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) gypsum is of great value in effectively utilizing the FGD gypsum. This paper focuses on the effect of seed crystal and some modifiers on the morphology of α-HH on a 500-1000 kg/batch setup based on a salt solution method established on the previous work. The pilot tests were carried out in a Ca-Mg-K chloride solution medium at 94 oC (±2 oC) under atmospheric pressure. The results show that a small amount of seeds is advantageous to prepare short-prism α-HH but results in needle-like and spherical crystals in the case of more than 1% addition. The well-shaped α-HH crystals can also be obtained by adding appropriate amounts of crystal modifiers like Fe3+ and the mixed salts of Al3+ and organics.
Microstructural Characterization of Non-Oriented Low Silicon Steel Produced by Compact Strip Production
Authors: Fu Yun Li , Wu Kai Ming
Published: December 2010

The macro structures, microstructures, textures and precipitates in non-oriented electrical steels were studied by means of optical microscopy, scanning electron microscopy (SEM), electron back scattering dispersion (EBSD) and transmission electron microscopy (TEM) in the specimens produced by conventional continuous casting process and thin slab continuous casting and direct rolling process. Results showed the macro structures in as-cast slabs and the microstructures in as-rolled strips were more fine-grained and uniform with regard to compact strip production (CSP) process, compared with that in conventional process. No obvious texture was observed in hot rolled strips produced by CSP process.
Mechanical Properties of Heat Treated 65Mn Steel Produced by Compact Strip Production
Authors: Huang Gang , Jiao Guo Hua , Wen De Zhi , Zhou Chun Quan , Wu Kai Ming
Published: December 2010

The mechanical properties of the heat treated 65Mn steel that produced by CSP (Compact Strip Production) and conventional continuous casting process were investigated. Measured results showed that 65Mn steel produced by CSP exhibits higher hardness than that produced by conventional continuous casting process. The better mechanical property was attributed to fine-grained microstructures in the as-rolled CSP strips.
Mechanical and Physical Properties of a High Strength Pressure Vessel Steel 12Cr2Mo1R
Authors: Wang Hong Hong , Li Ju Zhong , Xi Tian Hui , Wu Kai Ming
Published: December 2010

12Cr2Mo1R is a high strength pressure vessel steel used in the petrochemical industry. The mechanical and physical properties of the steel 12Cr2Mo1R which was developed in Wuhan Iron and Steel (Group) Company, were investigated in the present work. Test results showed that the steel 12Cr2Mo1R exhibits a high strength at room temperature and high temperature, high strength along Z-direction, and also has very good impact toughness at lower temperatures. The density, linear expansion coefficient and elasticity modulus were also measured. The measured values are all higher than the corresponding specifications of national standards. The uniform mechanical properties and physical properties is attributed to homogeneous microstructure through steel plates.
Analysis of Stress - Strain Curve on Recycled Aggregate Concrete under Uniaxial and Conventional Triaxial Compression
Authors: Yang Hai Feng , Deng Zhi Heng , Huang Ying
Published: December 2010

43 Φ50mm × 100mm column stress - strain curve tests are completed through RMT-201, which studied the compressive stress - strain curves of recycled aggregate concretes at distinct confining pressures under conventional triaxial stress state. This article, has analyzed the influence of different water-cement ratios, confining pressures on the curves, and raised constitutive equations of triaxial compression stress - strain curves for the different strength of recycled aggregate concretes.The brittleness indexes for recycled aggregate concrete under distinct confining pressures were analyzed contrastively. The result showed that: the failure modes of recycled aggregate concrete specimens are similar to those of ordinary concretes, but the final failure patterns of recycled aggregate and ordinary aggregate are quite different; with the increase of lateral pressure, the peak stress and peak strain of recycled aggregate concrete show linear growth; recycled aggregate concrete compressive stress - strain curves under the uniaxial and triaxial stress states are similar to ordinary aggregate concrete, yet peak strain shows signs of larger growth; with the increase of lateral pressure, the brittleness of recycled aggregate concrete reduces. The brittleness index of high-strength recycled aggregate concrete is larger wholly than that of ordinary recycled aggregate concrete and with confining pressure reaching a certain value, the brittleness index remains stable.
Experimental Study on Pavement Performance of SEBS Modified Asphalt Mixture
Authors: Zheng Chuan Feng , Wang Lei , Zhao Da Jun
Published: December 2010

pavement performance of SEBS modified asphalt mixture are analyzed. Dynamic shear rhometer(DSR) experiments were performed to evaluate the rheology properties of SEBS modified asphalt binder and performance of SEBS modified asphalt mixture was evaluated based on laboratory experiments, experiments included: wheel tracking, moisture susceptibility, low-temperature beam bending and fatigue. The results shows that the rheology properties of SEBS modified asphalt binder are more ideal than SBS modified asphalt binder on anti-fatigue effect. Tensile stress ratio(TSR) of SEBS modified asphalt mixture increases 5.0%, tensile strength increases 6.1% and tensile strain increases 19.8%, though the dynamic stability(DS) decreases 3.1%, the fatigue life-span increases significantly compared with SBS modified asphalt mixture. It means that pavement performance of SEBS modified asphalt mixture is better than SBS modified asphalt mixture, and it is more applicable to be utilized in highway engineerings and some special engineerings such as bridge deck pavement that need anti-fatigue performance.
Research on Mechanical Performance of Sisal Fiber Reinforced Concrete and its Mechanism
Authors: Bao Hui Ming , Li Shang
Published: December 2010

According to experiments by comparing with normal cement concrete and other fiber reinforced concrete, they analyze the mechanical properties and features of sisal fiber reinforced concrete. Besides, they observe the fracture process of different ages and contents of sisal fiber reinforced concrete and analyze the bonding property, toughening effect and failure mechanism. The results show that sisal fiber reinforced concrete is superior to normal cement concrete on mechanical properties, and has a feature of multi-cracking, while compared with other fiber reinforced concrete, it is more economical.
Activation Mechanism of Cement Paste for Waste Concrete Autoclaved Products
Authors: Ke Chang Jun , Wang Hao , Ke Tao
Published: December 2010

studied types and amount of hydration products in cement paste in waste concretes and effect of the cement paste in waste concrete for compressive strength of autoclaved waste concrete samples simulated by hydrated cement with X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Infrared Spectroscopy (IR). The results showed, compressive strength of autoclaved waste concrete products increased with cement paste in waste concrete increasing, and the effect reduced obviously when amount of cement paste exceed 12.5% in waste concrete. Cement paste calculated amount exceeds 12.5% according to present national specification for mix proportion design of ordinary concrete. And it shows that effect of cement paste in waste concrete is weakly for compressive strength of autoclaved waste concrete sample. And compressive strength of autoclaved waste concrete samples is unrelated to mix and age of waste concretes. Hydrated products such as hydrated calcium silicate (C-S-H), α-C2SH and hydrated calcium aluminate sulfate (AFm or AFt) in cement paste forming during normal temperature curing play a role of crystal seed in autoclaved waste concrete samples.
Optimization Design of Cooling System of Vacuum Calibrator for Plastics Profile Extrusion
Authors: Wang Qi Bing , Wang Zhi Ming , Peng An Hua
Published: December 2010

Plastic profile produced by extrusion die should be cooled down and calibrated by calibrator ,so the proper design of the cooling system in calibrator was very important to the profile quality .The cooling channels in calibrator were preliminarily designed according to target function, and peculiar heterotype optimum designs of the local cooling channels were carried out by means of numerical simulation , the cooling effect was improved obviously ,Based on enterprise resource planning ERP system and parallel project computer aided design/computer aided Engineering CAD/CAE intellectualized data-base network, design for the cooling system was more reasonable, and could meet the demands of customers much better.
Interaction and Molecular Weight Distribution Behavior in Polymer Blends of Styrene-Butadiene-Rubber and Bitumen
Authors: Jiang You Qing , Zhang Yun Bo
Published: December 2010

Styrene-Butadiene-Rubber (SBR) modified bitumen had improved properties in softening points, ductility, and aging resistance. It is due to variation of molecular weight (MW) and molecular weight distribution (MWD) of the product made during the blending between SBR and bitumen. Gel permeation chromatography (GPC) analytical results indicated interaction in polymer blends that bitumen macromolecular chain biting and chemical forces as well as intermolecular recombination formed new bitumen polymer blends.
Fracture Energy Analysis of Eco-Concretes in Japan
Authors: Aquino Carlos , Yagi Shogo , Okamoto Takahisa
Published: December 2010

The raw materials from household garbage and industrial waste have increased its usage in the concrete and cement industries. These eco-materials have helped the environment, avoiding pollution, land filling or burning of waste and the usage of other natural resources. However, the cost of many eco-materials is still higher than that of common natural materials. It is necessary to study in detail its behavior and properties to decrease its cost and increase its performance. This research deals with Eco-cement and molten slag aggregate which main raw materials are household garbage and industrial waste. Concretes produced with Portland cement and Eco-cement were mixed with gravel, limestone, quartz and molten slag aggregates to compare its properties. The fracture energy, strength and modulus of elasticity tests were performed and discussed in this paper. The concretes produced with Eco-cement and molten slag aggregate show better results than those produced with Portland cement and natural aggregates.
Analyses of Pathological Changes of Lingnan Ancient Stone Bridges
Authors: Li Xu Hong
Published: December 2010

Reasons of pathological changes of Lingnan ancient stone bridges are elaborated in this paper, classification of pathological changes and procedures of protection are discussed, methods of elimination of pathological changes and protection are also probed into. The purpose of this paper is to initiate people to have profound understanding to pathological changes of Lingnan ancient stone bridges to protect them in modernization strategy.
Steady State Dynamic Performance of the Slab with EPS-Blocks
Authors: Zhang Da Ying , Wang Lu Min , Liang Xing Pei
Published: December 2010

In this paper, novel filled materials EPS-blocks of cast-in-situ slabs are presented. And EPS-blocks with light weight which are inexpensive are validated to be sufficient strong as filled materials to bring an innovation for the development of cast-in-situ slabs. Based on modal analysis, it is found that the decreased weight has a greater influence to the mode of the slab than the weakened stiffness. According to harmonic response analysis, tensile stress distributions of the slab with EPS-blocks are depicted in figures and explained. Typically, orifice stress distributions are expounded and stress variations of nodes in different places are illustrated. From these studies, it is concluded that the steady state dynamic performance of the slab with EPS-blocks is good.
The Influence of Solar Radiation of External Decorative Materials on Energy-Saving of Buildings
Authors: Dong Hai Rong , Ma Jian Suo , Qi Shao Ming
Published: December 2010

Solar radiation is an important factor effecting indoor thermal environment. External decorative materials of buildings have different properties in absorbing, reflecting and re-radiating the solar radiation because of their different color, texture and degree of roughness. In this paper, based on the establishment of thermal gain or loss model of architectural enveloping structure, we analyzes the influence of solar radiation of different external decorative materials on energy-saving of buildings by theoretic analysis and calculation, which provides the reference for the selection of external decorative materials in architectural design.
Energy Conservation Analysis of VRV Air Conditioning System with Heat Recovery Ventilation in a Chinese Hotel Building
Authors: Cai Wei , Wu Zhao Hui , Yang Jian , Zhang Qiang
Published: December 2010

The effect of heat recovery ventilation on indoor temperature, carbon emissions and energy efficiency of variable refrigerant volume (VRV) system in a hotel building were investigated. The distribution of temperature in different zones of the building was tested, and energy consumption of this VRV system was analyzed. The results show that the VRV air conditioning system can meet the heating and cooling request of many rooms while at the same time maintain high energy efficiency. This system reduces thermal pollution for the outdoor environment greatly. It is one kind of highly effective energy conversion and utilization system.
Carbon Emissions Embodied in the International Trade of China
Authors: Zhou Hui , Yang Yong
Published: December 2010

This paper used input-output table and the energy consumption data by sector to estimate the effect of international trade on carbon emissions of China in 2007. The result shows that international trade has played a great part in increasing China’s carbon emissions. China is a net carbon exporter, with carbon emissions embodied in exports 583.4Mt, and emissions embodied in imports from 186.0 to 476.8 Mt, according to different assumptions taken. Besides, international trade increases the global emissions and makes the problem of global warming worse. Therefore the paper suggests that it is necessary to change the present ‘producer responsibility principle’ used in regional carbon accounting and allocate certain part of responsibility of the carbon emissions to consumers.
The Design and Implementation of Mobile CSCW Platform for 3G Network
Authors: Li Xiao Jun , Ye Feng
Published: December 2010

Because of the limitations of network and hardware, early mobile CSCW platform is not used widely. With the continuing escalation of mobile network, the mobile high-speed network of 3G has been constructed completely and the hardware of mobile devices has been upgraded continuously. It provides a good foundation for the mature application of mobile CSCW. This paper presents a framework of mobile CSCW platform for 3G network and describes the specific implementation. In this paper, Web Service, Socket, XML technologies are used to build server-side, and SOAP, HTTPS, SAX, and Socket technologies are used to build client-side. This platform presented in this paper can help enterprises to increase work efficiency in any network environment.
Research on Optimization Model of Vehicle Routing for Emergent Relief Supplies of Multi-Reserves
Authors: Zhao Tong , Fan Hou Ming , Wang Gui Lin
Published: December 2010

In the world today, science and technology in natural disasters forecasting is changing with each passing day and is built up to a rather high level. But local, territorial, even just national or worldwide scope natural disasters have also posed a grave menace to human well-being and development. Therefore, researching on optimizing problem of vehicle routing for emergent relief supplies of multi-reserves, it is vital significant to quickly send relief supplies to the sufferers after sudden natural disasters. Then, we draw out the mathematical model and solve the problem reasonably based on the improved ant colony algorithm, at last, we obtain the satisfy results through an empirical exemple.
Joint Application of Solar Water Heating System and Air-Conditioning System in a Dormitory Building
Authors: Wang Hai Ying , Hu Song Tao , Liu Jia Ping
Published: December 2010

Solar water heating system is used to supply hot water all-year-round for a new dormitory building. Flat solar energy collectors are mounted on the roof. The hot water tank and pumps are installed together with the air conditioning equipments in the plant room. Air cooled heat pump is used to provide cooling in summer, and high temperature water from boiler room (in old building) is used as heat source in winter. Usually auxiliary heating is necessary to improve the stability and reliability of solar water heating system. In this case, we take full use of the equipment of air conditioning system instead of electricity as auxiliary heating resources. In this paper, we introduced the design of the solar water heating system and the auxiliary heating method by air conditioning systems. The control strategies to fulfill all the functions and switch between different conditions are also introduced.
Industrial Structure Adjustment of Liuzhou Based on Circular Economy
Authors: Lu Guo Dan , Cheng Guan Wen , Fu Hong Yuan , Wei Wen Yuan
Published: December 2010

Circular economy with low consumption, low emission, high efficiency rate of basic features, development of circular economy required to optimize industrial structure adjustment. By analyzing tertiary industries and internal structure of tertiary industries in Liuzhou, preliminary view is large proportion of secondary industry, proportion of tertiary industry is small, development of three industries is uneven; internal structure of primary industry is not quite reasonable, main reason is large intermediate consumption of various industries, agricultural products of unit area yield is low, and development of modern agriculture lags behind, a large proportion of heavy industry in secondary industry, development of light industry lags behind, high resource consumption and pollutant emissions, tertiary industry traditional services industries has some basis, but it grows slowly, and its structure is not quite reasonable, need to be adjusted.