Frontiers of Green Building, Materials and Civil Engineering

Volumes 71-78

doi: 10.4028/

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Authors: Bin Jia, Zheng Liang Li, Hua Chuan Yao, Jun Lin Tao
Abstract: An experimental system is designed by combining the split Hopkinson pressure bar (SHPB) with microwave heating device, based on stress wave theory, availability of the experiment technique is analyzed. Tests of concrete whose temperature changes from room temperature to 650°C and impact velocity from 5m/s to 12m/s are completed and for the first time high-temperature dynamical damaging phenomena of concrete are obtained. Based on data analysis, the dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect whose influence keeps on decreasing with temperature increasing, but also the high temperature weakening effect. And the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence.
Authors: Xiao Ruan Song, Xiao Yun Zhang, Wei Dai, Yu Ting Qu, Zi Liang Xu
Abstract: For permanent cement-base formwork, due to stay-in-place with concrete during all the service life and minor size of the end surface, the splicing methods of traditional formworks are not adapted to be used. In allusion to natures of the cement-base formwork, this paper presents ten types of splicing methods. For each method, a group of specimens are prepared and whose capacity and deformation performance are investigated. And meanwhile, stress and deformability of the full specimens without joint are researched under the same conditions. Through above splicing experiments, some reliable splicing method is obtained. The experimental results provided by this paper present a gist for investigation and application of the permanent cement-base formwork.
Authors: Cheng Yi, Jing Shi, Xiao Long Zhao, Wen Hai Zhao, Qiang Liu, Hui Xin Liu
Abstract: As pointed out in this paper that, for a common building material, it is relatively difficult to judge its green degree in comparison with that for a special function material because the judgment factors are comprehensive. The relevant factors which affect the greenness index such as physic expenditure, pollution, economic are analyzed and all influential factors are discussed. For the common building materials, their different inter-restrain factors are divided in administrative level and the weight of factors is determined according to the AHP theory. Meanwhile, the assessment scale and criteria for the factors, and the grading standard for the material green degrees are given in the paper. Based on the fuzzy comprehensive evaluation theory, a green degree evaluation model is established. Finally, the reasonability of the model is testified with the instances introduced in the paper.
Authors: Tao Li, Chun Lan Zhou, Zhen Gang Liu, Wen Jing Wang, Yang Song, Zhi Hua Gao, Ye Duan, You Zhong Li
Abstract: In this paper, the improvement on electrical properties of screen-printed crystalline silicon solar cells by light-induced electroplating of silver is studied. Optical losses are analysed by the introduction of scale factor in the calculation. Electrical losses are mainly from the seed layer electrodes, top layer electrodes, the emitter, the base and the contact resistance between silicon and silver. Light-induced electroplating of silver is able to reduce the total power losses of screen-printed solar cells obviously by denser silver electrode. In experiment, the relative increments of I-V parameters as a function of electroplating time for crystalline silicon solar cells with 60μm, 75μm and 90μm wide seed layer electrodes are measured. After light-induced electroplating process, the cells efficiencies of 16.8%, 17.2% and 17.8% have reached on 60μm, 75μm and 90μm wide gridlines screen-printed solar cells, respectively. The calculated results and experimental data show good agreement. Due to the successful verification by comparing between numerical simulation and experimental data, the simulation results could be used to optimize the two-layer electrode structure and light-induced electroplating process.
Authors: Yun Feng Zhu
Abstract: Wuxi Dayao bricks and tiles are famous for their elegant form and durable quality, but they have gradually withdrawn from historical stage because of lack of innovation of modern technology. They are the crystallization of ancient peoples’ wisdom in transforming nature and improving their living qualities with over six hundred years’ traditional craftsmanship, and have profound significance for prolonging Chinese traditional architectural culture and improving existing building materials. Therefore, it is necessary to carry out researches and inheritance.
Authors: Yun Feng Zhu
Abstract: Huishan Ancient Town is a key heritage conservation unit in China which has the rare ancient shrine buildings. Currently, the Wuxi government has started the restoration project in Huishan Ancient Town which used a large number of traditional building materials. The purpose of this report is to research and analyze the use of these traditional building materials, which provide a valuable reference for other ancient buildings repair in the future.
Authors: Yun Feng Zhu
Abstract: Industrial design education has a big scale in China, which cultivates a large number of talents who have made a mass of contribution to enhance Chinese industrial competitive power. Currently, the domestic industrial design education is undergoing a transformation from quantity to quality, thus, it is necessary to do predictive analysis of demand for industrial design industry.
Authors: Jun Su, Shi Lang Xu, Dong Tao Xia
Abstract: In this article, through the seismic experimental analysis for six frame joints of ultra-high toughness cementitious composites, the load-carrying capacity, hysteretic behavior, energy dissipation and ductility of new joints are studied under different axial compressive ratio and the stirrups space. The experimental results show that the UHTCC joints have higher anti-cracking capacity and shear ductility. The UHTCC can reduce or even eliminate the amount of shear stirrups of the joint core. According to the analysis for the experiments, a theoretical calculating formula of shearing capacity is presented, whose calculating results agree well with the experimental results.
Authors: Cai Lin Liu, Yu Rong Zhang, Hai Jun Yang, Xian Yan Ren, Jun Xiao Yang
Abstract: A lauramide concrete foaming agent was prepared by a simple synthetic route using readily available N-(2-hydroxyethyl)ethylenediamine, dodecanoic acid, and chloroacetic acid. The reaction conditions were optimized by changing reaction temperature, reaction time, and/or molar ratios of reactants. Significantly, the concrete foaming agent has very low surface tension and good foaming properties, which could be directly used without purification and has widely applicable potentials in low-density foam concrete.
Authors: Zhao Yi He, Yang Cheng Huang, Gang Huang
Abstract: In order to solve the problems of environmental contamination, large resource consuming and inflammability of asphalt mixture, this research chooses warm-mix agent and fire retardant to double modify the asphalt. After obtain the method to produce the anti-flaming and warm-mix asphalt through orthogonal experiment, its road property and anti-flaming property are valued. According to the experiment result, under the condition of cooling down 30°C of the mix temperature, the modified anti-flaming and warm-mix asphalt can increase the high temperature property of the asphalt mixture, but decrease the low temperature property and water stability characteristic of it. This asphalt has excellent anti-flaming characteristic, so it can decrease the property loss after being burnt.

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