Applied Mechanics and Materials Vols. 744-746

Abstract: By analyzing two Polycarboxylate cement admixture of different polymerization process adaptability, the cement paste experiment is carried out to show the influence of Polycarboxylate superplasticizer, slump agent and the cement synthesis process on cement adaptability. Through orthogonal design method, result is drawn from the comparison of the influence of initial liquidity and an hour liquidity under different conditions,which is base on treating Polymeric acid process parameters as effecting factor within a certain range. It is shown that the preferably optimized process parameters of Polycarboxylic acid exist in the same kind of cement.The system error caused by the impact of cement composition is indicated in different kinds of cement.The adaptability of Polycarboxylic acid cement admixture of the mother liquor is available in the process optimization of the parameters.

Abstract: As far as the problems arising in the using of cracking mortar is concerned, a lot of work are done by researchers to improve the performance of cementations material, including adding various fibers into the cement matrix. The crack resistance mechanism of fiber-reinforced cement mortar is studied by scholars through a variety of methods. In this paper, the roles of fiber in fiber reinforced cement-based composite materials and the explanation thereof proposed by domestic and foreign scholars are summarized.

Abstract: Two mixtures were designed to manufacture ordinary Portland cement concrete (PCC) and alkali-activated fly ash geopolymeric concrete (FGC). The depth of carbonation at 3rd,7th,14th and 28th day were measured according to the carbonization test method in “Ordinary Concrete Long-term Performance and Durability Test Method Standard”(GB/T 50082-2009) by spotting with phenolphthalein solution. The changes of compressive strength of the specimens carbonized with different days were tested and compared, as well as the pH value of specimens’ surfaces. Furthermore, the changes in microstructure and chemical composition were observed through the scanning electronic microscope (SEM) and energy dispersive X-ray spectrometer (EDX), respectively. The results show that although the compressive strength of FGC decreased significantly at first, but there is no obvious effect of carbonization on compressive strength, pH value and chemical composition of FGC as carbonation going on. Moreover, the microstructure of FGC is more homogeneous and denser. It can be concluded that compared with PCC, carbonization resistance of FGC is much better.

Abstract: By comparing the study of 50# and 70# matrix asphalt and SBS modified asphalt to the influence law of high temperature performance, low temperature performance and water stability performance of ATB mixture, it can balance the relationship of the performance of every road in design method of ATB mixture. It suggests that we can use SBS modified asphalt in the condition of usually, use Low grade matrix asphalt or SBS modified asphalt in the condition of higher temperature requirements for the road , and use High grade matrix asphalt or SBS modified asphalt in the condition of the road in cold region.

Abstract: At present, polymers, fiber and other additives are added to the cement based materials by researchers at home and abroad for the purpose of dealing with the difficult problems occur in practical application, such as low tensile strength, small ultimate elongation, remarkable brittleness, easy to crack and other issues. In this paper, the shrinkage deformation of cement based materials are classified into four types upon the analysis of shrinkage reasons, then the inhibitory effect and its mechanism of polymers fiber for cement based material are investigated.

Abstract: The under surface depression of foam glass blanks as one of the typical defects, influences and impedes the quality of foam glass and material cutting rate. This paper studies the water content of release agent and open flame burning temperature effects on under depression of foam glass, to reveal its generation mechanism, using TG-DSC, XRD, FTIR, and other analytical methods. The results show that, with the increase of drying temperature, the under surface depression phenomenon reduces, indicating the air cavity caused by heating vaporization of water molecules. The surface is white. In the early flame heating, firing temperature is more than 700°C, by the mold bottom heating carbon, resulting in carbon black early reaction gas, not be wrapped by glass, eventually gathering to form an air chamber. The surface is grey.

Abstract: Ceramsite concrete and ceramsite concrete block are characterized by lightweight, high strength and good thermal insulation properties, which are widely applied to construction. If amoderate amount of polystyrene particles is added during the working process of ceramsite concrete block in order to improve its physical properties, a kind of new ceramsite concrete building materials is produced. Based on the experimental studies, the article expounds the physical and mechanical properties in terms of density, water absorption and compressive strength, with the purpose of providing reliable evidence for the application and popularization of new ceramsite concrete block.

Abstract: Due to the current over-exploitation and use of oil resources imminent danger of being exhausted, petroleum bitumen from oil, the problem of oil resources and environmental development of the current situation forces us to constantly look for and application of new, renewable alternative materials. Currently, the world's best research and development of biomass energy is an inexhaustible renewable energy. This paper researches on biological asphalt collect summary summarizes the current research status of biological asphalt, aggregate its application in road engineering performance, analyze their development, application prospects. Current research indicates that biological asphalt bitumen is an efficient alternative to petroleum products, to enhance road performance while conserving resources better.

Abstract: Different particle size range of waste glass powder amount to replace part of the cement made to mortar specimens, which were soaked in 5% sodium sulfate solution and water after standard curing .Then determining its mechanics properties in various ages, observing and analysis of the micro structure of the section of the specimens by SEM, exploring the ability of mortar specimens made in different size and dosage of waste glass resist to sulfate. The results indicate: Along with the rising of the size and content of glass powder. The performance of mortar specimens resisting to sulfate were on the decline. When replacement amount was 10%, all kinds of particle size of waste glass mortar specimens are better than that of ordinary Portland cement on mechanical properties, When the glass powder size is less than 53μm, all kinds of mortar specimens with high content of waste glass are better than that of ordinary Portland cement on mechanical properties.

Abstract: This article presenting results of subsidence measurement on experimental post-tensioned concrete slab model during static load test. This subsidence measurement was realized on the large scale concrete slab model and brought important data for computer modeling by FEM (finite element method). The experiment simulated the load effect of the base plate of heavy rack. In the course of the static load test subsidence was measured by set of potentiometric gauges at the particular points in real time. The experiment continue on research activity focused on problematic of interaction between concrete structures and subsoil and was realized at the Faculty of Civil Engineering, VSB – Technical University of Ostrava, Czech Republic.