bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanical and Post-Cracking Performance of Recycled Aggregate Concrete Incorporating Synthetic Fibers
Authors: Kazmi Syed M S , Munir Muhammad J , Wu Yufei , Patnaikuni Indubhushan 
Published: May 2020

Abstract
Reuse of concrete waste in novel construction is becoming very important topic nowadays. This study focuses to examine the post-cracking and mechanical performance, fracture behavior, and micro-structure of fiber strengthened recycled aggregate concrete (RAC). For this purpose, crack mouth opening diameter (CMOD) tests were conducted on twenty-seven notched beam specimens (550 × 150 × 150 mm) having three replacement levels (i.e., 0, 50 and 100%) of recycled concrete aggregates (RCA) and three synthetic fiber dosages (i.e., 0, 0.5 and 1%). Different mechanical properties of all mixes were also examined following ASTM standards. Drop in the mechanical performance of RAC was noticed at higher RCA replacement levels. However, synthetic fiber reinforced RAC showed better performance as compared to plain RAC. Results also depict positive influence of synthetic fiber addition on the residual flexural tensile strength of concrete. Approximately, 129% and 380% rise in toughness index and fracture energy was also observed for 1% fiber incorporation in RAC. Moreover, scanning electron microscopic analysis also confirmed the synthetic fiber-mortar bond. Therefore, synthetic fibers enhance the post-cracking and mechanical performance of fiber reinforced RAC resulting into more ductile and energy absorbing sustainable concrete.
Feasibility of PET Resin as a Cement Substitute for Sustainable Construction
Authors: Patil Y D , Waysal S M , Dholakiya B Z 
Published: May 2020

Abstract
Polyethylene Terephthalate (PET) is one of the most widely used plastics in the packaging industry. PET need hundreds of years to decompose. There is an increasing demand for cement in the construction industry. If we could use PET in construction, it will be an excellent relief for the environment.
In this study, PET bottles were used to produce a PET resin by glycolysis in polyethylene glycol. These resins were prepared for a different proportion of PET particles and were added in 5, 10, and 15 percent by mass of cement. The effect of this resin on standard consistency, setting time, together with slump flow and compressive strength of cement paste, is studied. It is observed that the addition of PET resin alters the standard consistency and compressive strength, increases the setting time and slump flow. The findings of this study suggest that PET waste can be utilized to replace cement.
Evaluation of Acoustic Environment of High-Rise Residential Space
Authors: Cheng Yumeng 
Published: May 2020

Abstract
As the most common type of urban residential form, high-rise residential space is the main place for people’s leisure and entertainment, so its acoustic environment quality is very important. In this paper, the acoustic environment of typical high-rise residential space is measured and analyzed, and survey questionnaires are statistically analyzed to explore the influence of listener’s behavioural factors and social factors on the perception of soundscape. In order to provide reference for related design and management work. The results show that behavior factor such as activity frequency, time, location and social factors such as sex and age was associated with soundscape evaluation significantly.
Evaluation of Mechanical Hardened Properties of Mortar Using Carbon-Free Fly Ash and Normal Fly Ash
Authors: Nazari Ghawsaddin , Takayuki Sato , Date Shigeyuki 
Published: May 2020

Abstract
Usage of mineral admixture and chemical admixture in concrete or mortar is a usual solution to reach full compaction, particularly where reinforcement blockage and lack of skilled labour happen. In this paper effect of mineral admixtures (Carbon-free fly ash, hereafter CfFA, and nFA) on hardened properties of mortar such as compressive strength, Pore size distribution and, and micro structures have been investigated. As a result, it has been confirmed that mortar containing 15% CfFA slightly increased the compressive strength under water curing condition compared to those containing 15% normal fly ash. In addition, the pore-size distribution of the mortar has been affected by variation of materials and curing condition. Mortar containing 30% CfFA had a smaller threshold diameter in comparison to that of 30% FA; however, there is no significance differences in mortar containing 15% CfFA and FA. Furthermore, CfFA-based mortar increased the amount of entrained air compared to the mortar with normal fly ash.
An Alternative Technique for Accelerated Carbonation of Normal Concrete
Authors: Ramesh Bura Akshay , Kondraivendhan B. 
Published: May 2020

Abstract
Carbonation is a continuous process in concrete structures and taking place for large period of time. The present study investigates accelerated carbonation effect on normal concrete with the help of Ammonium Bicarbonate (NH4HCO3) solution. Normal concrete specimens were exposed to carbonated water curing for different durations after initial 28 days of normal water curing. The effect of carbonated water curing on concrete specimens was studied with the help of compressive strength test and pH profiling test. From the results, it was observed that the compressive strength of normal concrete specimens increased and pH value increased along the depth from the surface with prolonged carbonated water curing.
Blast Mitigation Effects on Facade System with Projections Utilizing Fluid-Structure-Fluid Interaction
Authors: Patel Deepam , Desai Atul K 
Published: May 2020

Abstract
Various studies have been conducted on facade system exposed to blast loading have been explored in various studies. Studies conducted are limited to interaction between the fluid and solid domain neglecting the coupling effects of both domains. The impact upon interacting with a free standing will cause the structure to displace its position in the direction of the impact which will decrease the impact upon the structure. At the same time, the impact induced behind the structure will further reduce the effect of impact. This impact generated will marginally counteract the reduction of pressure on the structure. The displacement of the structure as well as shock-wave generated play a major role in reduction of impact on stationary structure. The effects of stress propagation within the structure have been ignored.
Research on the Influence of Variable Stiffness Levelling Piles on Differential Settlement of High-rise Buildings
Authors: Yang Yufeng , Gan Tengjun 
Published: May 2020

Abstract
Due to the differential settlement of the piled raft foundation of high-rise buildings and super high-rise buildings, secondary stresses will be generated in the superstructure, and variable stiffness leveling can solve this problem. However, different methods of laying piles may cause large differences in the amount of piles used and the bearing capacity of the foundation. In order to explore the effects of different combinations on differential settlement and internal forces, this article studies the upper structure and foundation as a whole, using finite element software ABAQUS, calculation and analysis of piled raft foundations under self-weight and lateral loads. The effects of different pile lengths, different pile diameters, dense piles, and different pile lengths and different pile diameters on the different settlements and internal forces are analyzed. The research found that the variable pile length form has the best effect on the control of differential settlement, followed by the variable pile pitch type, and the effect of the variable pile diameter, the combination of variable pile length and variable pile diameter is poor. The research results can guide the design unit’s design of pile distribution, and maximize the economy and safety.
Analysis of instruments and mathematical disposition using Rasch model
Authors: Suhaedi D , Fajar M Y , Sukarsih I , Permanasari Y 
Published: May 2020

Abstract
The purpose of this study is to analyze the instruments and mathematical dispositions of students. The instrument consisted of 22 items of mathematical disposition statements. Instrument testing was conducted on 18 private vocational students consisting of 6 males and 12 females. Analysis of the instruments and students’ mathematical dispositions was carried out using the Rasch model. The aspects analyzed consisted of mathematical disposition instruments, students ‘mathematical disposition abilities, the interaction between the instruments and students’ abilities of mathematical dispositions, and instrument quality. The results of the analysis of mathematical disposition instruments show that there are four items of instruments with difficult categories, thirteen items with medium categories, and five items with easy categories. Generally, the ability of students’ mathematical disposition is still low, compared to the demands of instrument difficulty. The interaction between instruments and students’ mathematical disposition abilities is very good. The consistency of answers from students is good, and the quality of the mathematical disposition instruments is sufficient.
Bus schedule modelling in Bandung, Indonesia, using max-plus algebra
Authors: Sugiarto I , Permana F J , Yosep A 
Published: May 2020

Abstract
Congestion has been a big problem in many big cities in the developing countries. One of the main factors causing traffic congestion is the lack of use of public transportations. The network problems related to synchronization problems, e.g. scheduling of public transportation, can be modeled and solved using the Max-plus algebra. Bandung as the capital and the biggest city in the West Java has also faced such a problem, that is congestion. In this paper, the scheduling of DAMRI bus, one of public transportation in Bandung will be modelled using the Max-plus algebra. We choose two DAMRI routes in Bandung, those are Dipatiukur - Leuwi Panjang and Ledeng - Leuwi Panjang. Both routes are transformed into a directed graph with the bus stops as the nodes. The Max-plus algebra is applied to develop the bus scheduling. In the developed model, the eigenvalues and eigenvectors of the system are calculated. The eigenvalues represent the period of departure at each bus stops and the eigenvectors represent the initial time of departure of the DAMRI bus. The results show that for every 3.7492308 minutes a bus will depart at each bus stop. If the DAMRI bus operation starts at 05.00, then the first departure should be from the bus stop in Pasir Kaliki to the bus stop in Hasan Sadikin Hospital.
Bearing degradation prediction based on support vector regression
Authors: Darwis S , Hajarisman N , Suliadi S , Widodo A 
Published: May 2020

Abstract
Predicting bearing degradation before reaching the state of risk of accident is one important issues in power generation insurance. This paper proposes a method based on support vector regression to achieve the goal. The method is applied on PRONOSTIA dataset which is an experimental platform dedicated to test methods related to bearing health assessment. The results show that the method can effectively model the evolution of the bearing degradation.
Techno-economic assessment for optimal electricity and diesel fuel production using corncob gasification–Fischer Tropsch process
Authors: Yulistiani F , Wachjoe C K 
Published: May 2020

Abstract
Biomass gasification technology has been developed in Indonesia in the last 30 years. However, the use of synthetic gas directly on diesel engine and steam turbine for electricity generation has a relatively low efficiency. New technology has been emerged to integrate thermal gasification with Fischer-Tropsch (FT) synthesis which then can be combined with heat and electricity production. This paper consists of techno-economic study for optimal electricity and diesel fuel production using corncob gasification integrated with FT process. Optimal production (409 GWh electricity, 58,900 kL fuel) can be achieved when using air and operating pressure 25 bar. Calculated production cost is 6,569 IDR/kL FT fuel and 245 IDR/kWh electricity. With average Indonesian electricity tariff 1,123 IDR/kWh, BGFT electricity production cost is much lower, about 22% of Indonesian electricity tariff. Corncob price change has higher effect on electricity production cost than water price change. So, if the electricity cost wants to be hold in economic level, then the corncob price should be held constant. The price will stay constant if there are no competitor that would use corncob as raw material. As of now, corncob still considered as waste that are not used for economic activities.
The influence size and composition of bioreactor from sand and compost to improve hold up liquid of bed
Authors: Fauzan A , Rispiandi R 
Published: May 2020

Abstract
Increasing population in Bandung will cause the need for products from plants also increase, while the available land decreases so that it is necessary to intensify the process in agriculture. One of them is by making plant bioreactors that can facilitate availability of water and nutrients in the land. The purpose of this study is to obtain the influence of bed variations on hold up liquid parameters of a bed. The tests included hold up liquid tests of various bed variations consisting of variations in size (not sieved; 4 - 2 mm; 2 - 1 mm; 1 mm - 500 μm; 500 - 250 μm and 250 - 125 μm) and composition variations (100 : 0; 25:75; 50:50; 75:25 and 0: 100) from compost and sand in order to get a good ratio of bed between sand and compost on hold up liquid in the soil. The total sample obtained is 30 samples. Based on the experimental results, it was concluded that the sand and compost with a ratio of 25: 75 and diameter of 500 - 250 μm as a good composition to increasing the holdup liquid value of bed with 0.3 hold up liquid.
Thermal design of cooler in the fuel handling pneumatic system of RDE
Authors: Dibyo S , Irianto I D , Bakhri S , Pancoko M 
Published: May 2020

Abstract
A small size reactor called Reaktor Daya Eksperimen (RDE) is being designed by BATAN. The nuclear reactor with the power of 10 MWt based on the High Temperature Gas-Cooled Reactor (HTGR) type. The helium gas with high temperature is used to remove the heat generated from the reactor core. Therefore, the helium gas as primary cooling system of reactor is high temperature. The typical of reactor cooling system is that the primary coolant system pressure should be lower than the secondary coolant pressure. In order to load a nuclear fuel pebble into the reactor core, a fuel handling system (FHS) is applied. In the FHS, a carrier gas of pneumatic system is important to blow the fuel pebbles. The objective of the research is to calculate the thermal design of cooler heat exchanger in which the high temperature of helium gas as carrier gas is reduced to be lower temperature. In this case, a cooler is used to cool the helium gas by coolant water. Based on the specification data requirement to calculate the thermal design of cooler, the ChemCAD.6.1.4 software was performed. A shell-tube type of heat exchanger has been determined to reduce the temperature of helium gas from 250°C to be less than 60°C at pressure of 30 bars. The water as a coolant is passed into the shell-side at temperature of 28°C. In the design calculation, it has carried out through a various consideration on aspects of safety as well as optimization. The result of thermal design are as follows: the heat exchanger of shell-tube type using fixed tube sheet with heat duty of 0.3122 MJ/s, the coolant water mass flow rate is 3.55 kg/s, surface area for heat transfer is 51.4471 m2 and Log Mean Temperature Difference (LMTD) is 81.53°C. Furthermore, the design result requirement of heat exchanger based on the specification, design tolerance and manufacture in appropriate with the TEMA standard of shell-tube type. The thermal design of cooler in the carrier gas of pneumatic system is expected to provide the design of FHS.
Effect of bean maturity and roasting temperature on chemical content of robusta coffee
Authors: Wahyuni N L E , Rispiandi R , Hariyadi T 
Published: May 2020

Abstract
This study aims to determine the effect of roasting temperature on chemical content of coffee beans at various fruit maturity. Robusta coffee was obtained from Karawang Regency, West Java. After picking, sortation, and drying in the sun to 10% moisture content, the coffee beans were roasted at 190°C, 200°C, 210°C for 12 minutes. Physical properties observed were weight loss during the roasting. The chemical content observed were water, caffeine, fat, chlorogenic acid and ash before and after roasting. Chemical content analysis was performed using gravimetric methods, soxhlet extraction, and UV-Vis spectrophotometry. The color, aroma and flavor of roasted bean were conducted by organoleptic test. The results obtained, the ripe coffee bean with roasting temperature of 210°C is the best, which gives the lowest yield. The unripe green beans have the highest water content. The roasting temperature did not provide a significant difference in fat, caffeine, chlorogenic acid, and ash content. Organoleptic test results (color and aroma) showed that the mature beans with roasting temperature of 200-210°C were the most preferred, while the coffee brew most preferred was overripe bean with the roasting temperature of 200°C.
Breakthrough curve investigation for analysing effectiveness of CO2 adsorption using K2CO3 in fixed bed column
Authors: Elizabeth L , Heriyanto H , Immah H , Aqshanrilyan K 
Published: May 2020

Abstract
Carbon dioxide contributed great amount of Green House Gas (GHG) emission. Solid adsorption is one of the way to ease or lower carbon dioxide emission. The objective of this study is investigating breakthrough curve of CO2 adsorption using K2CO3 solid in fixed bed column. Adsorption experiment is used to analysed adsorption capacity, breakpoint time and length of effective bed height. K2CO3 used as adsorbent and rice husk as support. The K2CO3 adsorption occurred under mild condition. The CO2 inlet and outlet concentration were analysed by acid-base titration. The highest adsorption capacity by K2CO3/rice husk is 0.2 mmol/g adsorbent at CO2 inlet flow rate 28 LPM (litre per minutes) by 50 gr K2CO3 adsorbent. it is necessary to vary other parameter because CO2 flow rate (15,9 and 28 LPM) and adsorbent amount (50-125 gr) do not affect adsorption capacity significantly.
Effects of pretreatments and different types of microbial starter on biogas production from food waste
Authors: Gantina T M , Wachjoe C K , Kurniasetiawati A S 
Published: May 2020

AbstractThe problem with the slow process of anaerobic biodegradation, especially in food waste, is that the rate of biogas production cannot keep up with market’s high demands for fuel. Several studies have tried out to optimize the rate of biogas formation, such as the addition of microbial starters and pretreatments. The objective of this research is to examine the production and characteristics of biogas made of vegetable market waste added by EM-4 and GP-7 microbial starter using a single batch biodigester system. The specific target is to determine the performance of biogas production process by combining the two techniques. The methods used consists of the design and manufacture of batch system biodigesters, determination of raw material characteristics, preparation of raw materials by pretreatment and addition of starters, namely EM-4 and GP-7. By combining the two techniques, biogas production with greater volumes and concentrations of methane gas can be obtained in a relatively short period. Pretreatment with NaOH 3% solution and the addition of cow dung starter and GP-7 can increase biogas production with the largest methane content on the 45th day and reached 38.32% of CH4 while pretreatment with NaOH with starter EM-4 and cow dung only reached 22.5%.
Sediment control analysis due to erosion and sediment in Cipunagara watershed, Indonesia, using SWAT model
Authors: Fitriyana E N , Supratman O , Mardiani M 
Published: May 2020

Abstract
Erosion and sediment are parameters that describe the critical level of a watershed. Cipunagara watershed is one of the most critical watershed in Indonesia. Therefore, we need a study of sediment control due to erosion and sediment. This study aims to determine the level of erosion in Cipunagara watershed, find out sediments in Cipunagara River, and determine the sediment control structure that can be applied in Cipunagara River. The method used in this research is quantitative descriptive method with modelling on SWAT. The analysis was performed using secondary data in 2005-2014. Modelling in SWAT divides Cipunagara watershed into 33 Sub Watersheds. The highest erosion value during years data occurred in Sub-watershed 18 of 654,402 tons/ha/year with very severe erosion criteria and the lowest in Sub-watershed 5 of 1,075 tons/ha/year with very mild erosion criteria. The highest sediment value is in River 25 which is 1754758.30 tons/year, and the lowest in River 7 which is 7174.40 tons/year. Sediment control in Cipunagara watershed can use check dams that place on River 18 and River 25.
Repairment of clay shale soil by stabilization method using a cement binder
Authors: Fathurrohman A M , Syahril S , Somantri A K 
Published: May 2020

Abstract
Clay shale is a type of clay that is easy to expand when it comes into contact with water because of the montmorillonite clay mineral it contains. The effect of water also causes a decrease in strength in the clay shale. As a result of the clay shale behavior, some buildings become damaged or landslides occur on the slope. The soil stabilization method with a cement binder is one solution to improve the detrimental properties of the clay shale. The selected cement content variations are 20, 30, and 40%. Cement Water Factor 35% for all variations. Laboratory testing is carried out at 0, 7, 14, and 21 days. Tests carried out in the form of specific gravity, swelling, atterberg limits, unconfined compressive, cation exchange capacity, X-Ray Difraction (XRD), and Scanning Electron Mycroscope (SEM). Tests show that the most optimum mixture is 30% clay shale-cement (CS-C30). CS-C30 produces changes in clay shale parameters including an increase in compressive strength without any decrease, and a reduction in the expansive nature as indicated by the decrease in the value of swelling pressure, and cation exchange capacity. Changes in these parameters are suspected because it already does not contain montmorillonite in CS-C30 based on XRD.