Applied Mechanics and Materials Vols. 204-208

Abstract: There are 6 group of experimental research to explore the relationship between shale ceramist concrete compressive strength and ceramic cylinder compressive strength, particle size, absorption time. The result shows that the strength of shale ceramist concrete is not only relevant with the ceramic cylinder compressive strength, but also relevant with the aggregate size, absorption time. For single graded particle size concrete, the strength of concrete decreased with grain size increasing. The longer time of ceramic absorption, the more sufficient the ceramist concrete strength development.

Abstract: Intelligent control for structural vibration is the international research frontiers in vibration control. The intelligent material and intelligent adjustable dampers and smart material actuator has the advantages of simple structure, easy adjustment, small energy consumption, driving the rapid response, almost without delay, in active structural control, semi-active control and passive control, has broad application prospects. The actuator is setted on the structure as a control mechanism, the control mechanism and the structure resist the vibration dynamic loads together, reduce the dynamic response of structure, improve the shock resistance performance of the structure.

Abstract: In this paper, the metakaolin is used as the raw material with aluminosilicate compounds to produce the geopolymer. The effects of three levels of two major controlling factors, the degree of polymerization of the activating solution (weight ratio of SiO2 to Na2O) of 0.4, 0.7 and 1.0 and the weight ratio of liquid to solid (L/S) of 0.7, 0.85 and 1.00 on the engineering properties of geopolymer are investigated. The experimental results show that, at age of 28 days, the compressive strength increases from the lowest 37.33 MPa (SiO2/Na2O = 0.4 and L/S = 0.7) to the highest 71.21 MPa (SiO2/Na2O = 0.7 and L/S = 0.7). While, the thermal conductivity increases from the lowest 0.39 w/mk (SiO2/Na2O = 0.4 and L/S = 1.0) to the highest 0.761 w/mk (SiO2/Na2O = 1.0 and L/S = 0.7).

Abstract: The effect of curing condition of five different composition of Portland composite cement (PCC) and ordinary Portland cement (OPC) were investigated in this study. Compressive strength development of five different concrete types has been investigated in terms of cement content and curing duration. From the experimental observation, it is found that the early age strength of concrete made with PCC is lower than that of concrete made with OPC due to the presence of fly ash in PCC which is responsible for the pozzolanic reaction. The continued pozzolanic activity of fly ash contributes to increase strength gain at later ages at continued curing condition. It is also found that drying ambient conditions reduction of the strength potential of concrete made with PCC because the secondary (pozzolanic) reaction fails to contribute to the development of strength.

Abstract: This paper mainly studies on the problem of the temperature cracks of the concrete perforated brick masonry structure by finite element model simulation and the stress distribution of masonry at the top window sill elevation under temperature difference effect. Analysis the influence of setting ring beam at the top window sill elevation on temperature stress of masonry, Summed up some measures about control and prevention of masonry temperature cracks at the top window sill elevation, it can be referenced for concrete perforated brick masonry structure design and construction.

Abstract: In this paper, improved adhesion of between asphalt and granite and the performance of high temperature and water stability of granite asphalt mixture by the coupling agent were discussed. The results show that the titanate coupling agent and silane coupling agent doped in asphalt can significantly improve the rutting resistance and water stability of the granite asphalt mixture.

Abstract: New construction materials are the new generations of construction materials which are on the basis of the traditional construction materials, including the new wall materials, thermal insulation materials, water sealing materials, decoration materials and etc. New construction materials industry is developed with the deeply reforming and opening of China. This paper introduces the basic concepts and characters of the new construction materials, analyzes the development and application of the new construction materials, and then discusses countermeasures and suggestions of the development of the new construction materials.

Abstract: By separate modeling analysis based upon ANSYS, SOLID65 unit of the entity is selected to simulate ceramsite concrete, and reinforcing performance is selected to simulate the effect of reinforcing steel bar. The strength on natural frequency’s effects was studied through changing the ansys model’s material parameters of ceramsite concrete. The strength of ceramsite concrete can be determined and applied to the anti-seismic design according to the size of the environmental vibration frequency.

Abstract: Reinforcing steel bars coated with pure enamel and fusion-bonded epoxy (FBE) were immersed in 3.5 wt.% NaCl solution for a period of 84 days. Predetermined damage of the coatings was created with a standard impact tester to study the coating resistance to potential damage caused during transportation and construction. Open-circuit potential and electrochemical impedance spectroscopy (EIS) tests were used to investigate deterioration processes of the two coating systems. An equivalent electrical circuit model was established to extract corrosion-indicative dielectric properties of enamel and FBE coatings from the EIS data. The change of coating capacitance over time was represented by a diffusion-controlled process. In comparison with the FBE coating with the same extent of damage, the enamel coating corroded sooner due to its thinner layer and porous microstructure, but deteriorated more slowly due to its robust bond with the steel substrate.

Abstract: Abstract: Phenolic-Formaldehyde(PF) foam was improved by co-foaming of PF resin modified using Nitrile Butadiene Rubber Power(NBRP) and other additives in the closing mould at 70°C. The effects of amount of NBRP on mechanical properties and microscopic structure of NBRP-PF foam were investigated. The results indicated that NBRP can improve the mechanical properties.When 2 percent NBRP of foam was used, the comprehensive performance was the best. This could be a consequence of cooperation of NBRP and PF resin.