Papers by Keyword: Durability

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Authors: Jie Rui, Guo Ming Li, Bing Wang, Zong Ren Wang
Abstract: Based on the discussion of the quality control and management requirements for the concrete raw materials, the raw materials preservation heat in the mixing concrete process and the note in the process of transportation with the requirements both in concrete casting process and the casting vibrating process, the paper proposes the construction key technology of improving the durability of the concrete in alpine region.
Authors: Fu Sheng Liu, Jun Fan, Han Bing Bian
Abstract: In this paper it is shown that compacted wheat straw block is a cost effective building material in China. Wheat straw is renewable resource and ecological material, when used as building material; it is less energy and material consumption. The compacted wheat straw block has a small thermal diffusivity and good fire resistance. The hydraulic properties will guarantee a comfortable humidity of in door air, and protect the material from rot, and ensure the durability of the construction. The mechanical properties will also increase the structure safety. It is absolutely a cost effective building material.
Authors: Yoshimitsu Sakaguchi
Abstract: A new hydrocarbon-type polymer electrolyte membrane has been developed as a candidate of commercially available product for DMFC application. The membrane shows lower methanol crossover and swelling in the methanol aqueous solution than perfluorosulfonic acid membrane does. As a result, MEA made from the membrane showed higher power density than that of perfluorosulfonic acid membrane at higher concentration of feed methanol solution and higher current density without tremendous flooding. Promising result of the practical durability with continuous fuel cell operation for 8000 hours was also confirmed with this membrane.
Authors: Li Bing Jin, Xiao Li Xiong, Zhao Ran Xiao, Cheng Ying Dong
Abstract: In order to evaluate and predict the behaviors of concrete structures under the normal atmospheric conditions, a new similarity experimental method is presented which can evaluate the field performance of reinforced concrete (RC) structures by measuring the structure in the artificial accelerated environment. The causes of concrete structural damage and the social harm caused by the RC structural durability failure were analyzed. The current status of concrete carbonation was described. The method establishes the similarity-relationship of performance changing between the field and the accelerated environmental conditions by contrasting and analyzing the behaviors changing under both environments, and realizes the effective and exact estimate to the field structures from the indoor accelerated experiments. It brings forward a new way of thinking to test the RC structures under the atmospheric conditions.
Authors: Cheng Wei Hou, Zhi Jiang Cai
Abstract: In this paper, electro-active actuator made with cellulose and polyurethane blend film is prepared, which can show high bending displacement in the air with room humidity condition. To fabricate this actuator, cotton cellulose was dissolved into a N,N-dimethylacetamide (DMAc) and lithium chloride (LiCl) solvent system. Polyurethane prepared by poly[di(ethylene glycol) adipate] and hexamethylene diisocyanate (HDI) was mixed with DMAc cellulose solution by stirring. The mixed solution was cast to form a film followed by depositing thin gold electrode on both sides of the film. The actuator was actuated under AC voltage at an ambient condition by changing the actuation voltage, frequency and time. The actuator revealed a large bending displacement under low activation voltage, low electrical power consumption and good durability at room condition. This cellulose- polyurethane blend actuator is suitable for dry and durable actuator and promising for many biomimetic applications in foreseeable future.
Authors: Jing Mei Bian, Quan Bai, Yu Mei Kang, Jun Zhang
Abstract: Concrete bridges are most widely used all over the world, it has important practical significance to research the durability. In this paper, research progress home and abroad of durability and maintenance decision for concrete bridge is summarized. The main problems in research are pointed out and future research tendency is discussed. The content of this paper has good reference value for correlation study.
Authors: Wan Mastura Wan Ibrahim, Kamarudin Hussin, Mohd Mustafa Al Bakri Abdullah, Aeslina Abdul Kadir, Mohammed Binhussain
Abstract: This paper offers a review on production of fly ash-based geopolymer bricks.Bricks are the world’s most versatile, durable and reliable construction material.Conventional bricks are produced from clay with high temperature kiln firing or from ordinary Portland cement (OPC) concrete,and thus contain high embodied energy and have large carbon footprint. In many areas of the world,there is already a shortage of natural source material for production of the conventional bricks. For environmentalprotection and sustainable development, extensive research has been conducted on productionof bricks from waste materials.Fly ash is a waste material of coal firing thermal plants and its accumulation near power plants causes severe pollution problems. Therefore, its utilization as a raw material for brick making will be a very beneficial solution in terms of economic and environmental aspects.
Authors: Xiao Ke Li, Li Sun, Y.Y. Zhou, Shun Bo Zhao
Abstract: The steel-polypropylene hybrid fiber reinforced concrete can take full advantages of macro-scale crack resistance and toughening effect on the concrete matrix of steel and polypropylene fibers. The shortcomings of concrete are improved and there is a wide prospect application in engineering. This paper summarizes the enhancement theories of hybrid fiber reinforced concrete to explain its strengthening mechanism. The research status is reviewed including mix proportion design, working performance of fresh concrete, mechanical behaviors, durability (impermeability, shrinkage and others), and engineering applications etc. Some further researches are forecasted. It would be very useful to apply and popularize steel-polypropylene hybrid fiber reinforced concrete.
Authors: Hong Bo Liu, Jing Sun, Xiao Hong Cong
Abstract: Analyzing the related literature at home and abroad, this paper summarized the results and shared them with reasearchers involved in the field on the recycled aggregate concrete (RAC). In this paper, the durability of RAC will be described from the following several aspects: absorption, chloride permeability, freezing and thawing resistance, carbonation, the sulfate corrosion resistance, drying shrinkage, creep and abrasion resistance. This paper expounded the present situation and progress in the study of the durability of recycled aggregate concrete.Then, some key technical problems needed to be studied were pointed out and many suggestions were put forward.
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