Advanced Materials Research Vols. 919-921

Abstract: Adopting orthogonal design method in the SFRHSC mix design, only a few experiments would be needed in the study on many influential factors with different level in mix design. The authors studied the SFRHSC mix design of a long-span shell construction as an example, analyzed the influential patterns of SFRHSC workability and strength with different additives. The significance of influential factors were determined by the experiment, and better mix design which meet the design and construction requirements was obtained. The approach to applying mathematic statistics in the mix design of the SFRHSC plays significant role in the material study and engineering practice. The results of experiment study can be reference to other similar projects.

Abstract: RCM method working principle, apparatus and procedures were briefly introduced, the existing problems were analyzed, the authenticity of testing concrete chloride ion permeability resistance were analyzed from the aspects of timeliness and, the practicability combining with actual application and experimental study, the application occasion and concrete durability level was put forward.

Abstract: By considering the four secondary moment functions ,which are developed according to virtual plastic stress distribution at the perforated section of continuous composite beam. reinforced opening proved to be necessary and reliable .Several reinforcing methods are reserched. mechanical properties are compared with FE results in different reinforced continuous composite beam.The result indicates that the bending and vertical shear capacity of continuous composite beam with web opening can be effectively enhanced to a certain extent. In addition,stiffness and local stability at web opening area are also increase. Effective reinforcing method is presented and can be used in engineering practice.

Abstract: Used recycled brick powder as active mineral admixture is a development prospect research direction in the new foam concrete system. Performance effects of lime and plaster as exciting agent on different gelled material system brick powder foam concrete were studied. The experimental results show that: when gelled material system is cement: brick powder=70:30, using 25% lime or 20% gypsum can obtain higher strength and lower water absorption foam concrete; when gelled material systems are cement: brick powder: fly ash=70:15:15, 60:20:20 and 50:25:25, compressive strength and water absorption are better than using lime and gypsum separately.

Abstract: Foam concrete is a new kind of energy-saving and environmentally friendly building materials. The main features of foam concrete are lightweight,thermal insulation performance,sound proof performance,waterproof performance,environmental performance,etc;Study the principle of the preparation of foam concrete and the preparation process;Overview the research progress of application at home and abroad;The problems of the application on foam concrete and the prospect are shown.

Abstract: Abstract. It was based on bridge anchor structure of three gorges reservoir area, from the perspective of enhancing the anti-permeability performance of mass concrete, taking into account the economic perspective, with the use of large dosage of fly ash and slag powder to replace cement to reduce the water-binder ratio and hydration heat, improve the anti-permeability performance of concrete, according to the characteristics of mass concrete. Through the test, the influence law of admixtures on impermeability of C30 mass concrete were obtained, and at the same time the better mix proportion of C30 anti-seepage mass concrete used in bridge anchor structure was recommended.

Abstract: The article studies the impact of steel fiber on the performance of lightweight aggregate concrete,including compressive strength, flexural strength, modulus of elasticity and impact toughness. The experimental studies show that steel fiber has little effect on the compressive strength of lightweight aggregate concrete, however, it can improve the pattern obviously. With the increasing of steel fiber content, the flexural strength and impact toughness of concrete increases. With the increasing of steel fiber content ,the elastic modulus of concrete also increases. The studies of this paper provide a certain technical references with the future research of steel fiber reinforced lightweight aggregate concrete.

Abstract: Biomass ash (cattle manure ash, CMA) is a waste which comes from combustion cattle manure to gain heat and electric energy. Aim reducing the emission of carbon dioxide that comes from cement production in the period of realizing the Twelfth Five-Year Plan for National Economic and Social Development of China. emission of carbon dioxide of biomass (cattle manure) combustion, the chemical propriety of the biomass (cattle manure) ash and the CMAs present situation of application in concrete are studied in the paper. the result indicate that the biomass ash (CMA) replacing some cement in concrete is feasibility, the analysis will provide basic data for generalizing biomass ash (CMA) application in the concrete.

Abstract: The impact compression tests on HPP hybrid fibers reinforced lightweight aggregate concrete were performed with 100mm SHPB equipment. The dynamic mechanical properties and variation of HPP hybrid fibers reinforced lightweight aggregate concrete under different strain rates and loading methods were systematically studied. HPP hybrid fibers reinforced lightweight aggregate concrete is of the property of strain rate effects under impact loads as ordinary concrete. The dynamic strength and peak strain of it increased with the increase of strain rate. During multiple-impact compression tests, the specimens were able to bear multiple impacts before damage after cracks were produced. It is clear that HPP hybrid fibers reinforced lightweight aggregate concrete is an outstanding material for protective engineering to resist repetitive impacts.

Abstract: This research determined the proper gradation of clay brick powder, PET to clay brick powder ratio, and curing temperature. Density, compressive, and tensile strength of the PET-Brick Powder Mixture were also studied. The research results indicate that the mixture had lower density and water absorption. The strength increased quickly and reached the 94% of 28-day strength at 6 hours. The proper initial curing temperature is 180°C.