Applied Mechanics and Materials Vols. 193-194

Abstract: In this paper, the evolution of the gas evolved during the heat treatment of the plasticized melt-spun PAN fibers was investigated by TG-FTIR. TG, DTG and G-S (Gram-Schmidt) curves showed that there were two main decomposition stages during the heat treatment of melt-spun PAN fibers. And the results indicated that the main pyrolysis products were NH3 (966 cm-1 and 932 cm-1), HCN (713 cm-1), H2O (3650 cm-1), CH4 (1305cm-1), CO (2180 cm-1), CO2 (2360 cm-1 and 667 cm-1). The release of NH3 and HCN started at the same temperature 220 °C, which were the main products during the stabilization step. Besides, the formation mechanism of the pyrolysis products is presented in detail.

Abstract: This article introduces several common building materials and new-style energy-saving materials, and their advantages and disadvantages are given. Reactive power concrete and FRP reinforcement will be applied widely in actual engineering. Through specific examples engineering cost of energy-saving materials is introduced, finally gives the building developments and future directions, these can provide reference for application of novel materials in construction project.

Abstract: Using the waste crumb rubber modified asphalt to pave the road surface could reduce cost and save energy. However，in order to obtain adequate workability, the mixing temperature and compaction temperature of rubberized asphalt binder and its mixture is much higher than those of conventional asphalt mixtures. Warm Mix Asphalt (WMA) is the name given to certain technologies that reduce the production and placement temperatures of asphalt mixes. One of the main benefits advertised is the increased workability at conventional and lower compaction temperatures with the WMA addition. This paper evaluates whether there are any synergy effects of using warm mix technologies and Asphalt Rubber(AR) hot mixes. This paper summarizes a lab research to evaluate the workability of Asphalt Rubber hot mixes containing warm mix technologies. Both asphalt binder and asphalt mixture were evaluated and compared. The research suggests that combining WMA technology with Asphalt Rubber mixtures is a win-win.

Abstract: The corrosion behavior of common pressed prepainted steel sheets with trade mark TDC51D+Z was studied by neutral salt spray and electrochemical impedance spectroscopy (EIS). The effect of organic polymers on the corrosion performance of prepainted steel sheet was analyzed with glow discharge optical emission spectrometry (GDS). The results showed that the distributing depth of titanium pigment determined the corrosion performance of prepainted steel sheets with white finishing coat.

Abstract: Eu doped YAG glass ceramics containing single phase of YAG micro-cryatals have been obtained by heat-treating the aluminosilicate precursor glasses. The primary crystallite size of YAG phase is calculated to be ~46 nm and the crystal grains grow with preffered orientation (444) in the internal network. The average secondary particle size is estimated to be ~8μm and the larger grain size is due to the particle aggregation. The pilotaxitic texture of YAG glass ceramics presented in SEM micrograph, can increase yield strength and tensile strength of the sample effectively. The emission spectrum of Eu doped YAG glass ceramics consists of a broad blue emission band and several narrow emission bands, indicating the coexistence of Eu³⁺ and Eu²⁺ ions in YAG glass ceramics.

Abstract: In this paper, based on the similarity between chloride diffusion equation in concrete and heat conduction equation the thermal analysis module of the ANSYS finite element software was used to carry out the numerical simulation for chloride ion diffusion process in concrete. And the numerical results were compared with the analytical solutions of chloride diffusion equation, which showed that the method is effective for the chloride diffusion analysis. Time-dependence of chloride diffusion coefficient in concrete was considered by amending the chloride diffusion coefficient with various parameters. Finally it is a feasible method that the chloride ion concentration in concrete structures was calculated by thermal analysis module of the ANSYS.

Abstract: This paper presents the effect of added limestone powder (LS) on the fresh and cured properties of self-compacting concrete (SCC) containing cathode ray tube glass waste. The concrete was produced using ordinary Portland cement at a water-cement (W/C) ratio of 0.38 by weight. CRT glass waste cullet was incorporated in river sand in proportions of 20 or 40%. To suppress potential viscosity effects limestone powder was added at levels of 5, 10, or 15% by weight. The slump flow time, slump flow diameter, V-funnel flow time, Marsh cone flow time, and setting time of the fresh concrete were tested, as well as the compressive strength and ultrasonic pulse velocity of the hardened concrete. The slump flow, V-funnel flow time, and Marsh cone flow increased with increasing limestone powder content, while the compressive strength and ultrasonic pulse velocity decreased. The results demonstrate that it is feasible to use limestone powder to produce SCC containing CRT glass waste as a fine aggregate replacement.

Abstract: The development of stress-induced anisotropy in clay which was not only decided by the maximum stress endured before, but mainly lied on the stress route that reaching the maximum stress point of clay. The development or disappearance means of stress-induced anisotropy of normally consolidated clay, anisotropic consolidation clay and over-consolidated clay with different stress history are analyzed by experiments. Additionally, the effect of stress-induced anisotropy on deformation is also analyzed.

Abstract: The construction industry has relied heavily on plywood for residential and commercial interior finish. In order to reduce the fire hazard caused by flammable plywood, it is necessary to treat plywood with flame retardant which leads to the reduction of bonding strength and limits the widely application of flame retardant plywood. The objective of this paper was to study the effect of 3A, 4A, 5A and 13X zeolite added into urea formaldehyde (UF) resin on the bonding strength and the LOI values of phosphorus-nitrogen (P-N) flame retardant (FR) plywood. The results showed that zeolites added into UF resin improved the bonding strength of flame retardant plywood. 13X zeolite had the highest efficiency in enhancing the bonding strength. 4A zeolite had a synergistic effect on P-N flame retardant when it was added into UF resin. 3A, 5A and 13X zeolites showed little negative effect on LOI values of flame retardant plywood.

Abstract: In order to separate early-gae autogenous shrinkage from thermal deformation, it is the key to measure accurately thermal expansion coefficient of concrete at early ages. By analysing deeply the research status of early-age thermal expansion coefficient of concrete, the influences of temperature history on early-age autogenous shrinkage and the selection of thermal expansion coefficient are discussed. Moreover, based on the existing methods of separating early-gae autogenous shrinkage from thermal deformation, the more reasonable two-phase separating method considering concrete ages is provided.