Applied Mechanics and Materials Vols. 275-277

Abstract: The CuS flower-like superstructures were selectively and facilely synthesized by a hydrothermal method at 120 °C. The EDS, SEM, HRTEM and FFT results show that the CuS superstore has a well-defined uniform 3-dimensional flower-like morphology. These superstructures have sizes of about 500 nm and are built from several intersectional nanoplates, which have a mean length of about 500 nm and an average thickness of about 50 nm. Optical absorption spectrum of the CuS superstructure shows it has good absorption in the near-IR region and the band gap is 2.08 eV.

Abstract: Pure CdTe thin films and metal Sb-doped CdTe thin films are prepared on soda lime glass substrates by vacuum evaporation method. The prepared films have a cubic crystal structure with a preferential growth orientation along CdTe (111) crystal orientation. The experimental results show that the film surface doped Sb is more compact and uniform. And doping Sb in pure CdTe thin films significantly enhance the optical absorption and reduce the width of the band gap, which means that the optical absorption range of CdTe thin films can be widened. Finally, on the aspect of electrical properties, the resistivity of the thin films has significantly been lower.

Abstract: Gallium nitride (GaN) thin films samples were grown by metal-organic chemical vapor deposition (MOCVD) with ammonia and trimethyl-gallium, and the samples were annealed rapidly at different temperature. The scanning electron microscope (SEM) analysis was employed to study the surface morphology and lattice defects of the GaN thin films. The surface morphology of the thin films prepared at different condition was uniform and smoothly. The relationship of the films defects and the annealed temperature were summarized.

Abstract: For improving the anti-sliding performance of asphalt pavement in ice-snow areas, a new structure is constructed by using the saline content snowmelt agent- Mafilon, and its mix proportions and construction technology are researched. The experiment result shows that Mafilon material replaces the mineral powder in asphalt concrete with 5%, and this new pavement has good anti-sliding performance in frozen zone. This new pavement is used on the freeway with long and continuous steep vertical slope, and the result shows that the ice and snow landing on the pavement will melt instantly, and don’t ice, so the vehicles may not slipping. The traffic safety is greatly improved. Thereby, the design of mix proportions and construction technology given in this article can be taken as reference for the extending using of asphalt pavement with anti-sliding performance.

Abstract: Low-density foam concrete is inorganic silicate material replace to traditional organic materials for external wall insulation system. Based on the analysis of structure formation mechanism of foaming foam concrete prepared with chemical method, investigation by a large number of comparative tests and quantitative analysis, quantitative relationship of compressive strength, tensile strength, and blowing agent dosage quantitative of 3d, 7d and 28d foaming concrete are analyzed. The relationship between blowing agent and foam concrete strength and thermal conductivity variation is revealed by the research of doped foaming agent concrete strength, improved workability mechanism. And further, independent sealing pores, high mechanical strength of pore wall, pore structure approximate to sphere and pore diameter with similar and small size were all favorable factors for higher strength of foam concrete.

Abstract: Low-density foam concrete is inorganic silicate material that can replace traditional organic materials for external wall insulation system. Based on the analysis of structure formation mechanism of foaming foam concrete prepared with chemical method, investigation by a large number of comparative tests and quantitative analysis, quantitative relationship of compressive strength, tensile strength, and blowing agent dosage quantitative of 3d, 7d and 28d foaming concrete are analyzed. The relationship between blowing agent and foam concrete strength and thermal conductivity variation is revealed by the research of doped fly ash concrete strength, improved workability mechanism. And further, independent sealing pores, high mechanical strength of pore wall, pore structure approximate to sphere and pore diameter with similar and small size were all favorable factors for higher strength of foam concrete.

Abstract: In this paper,the mechanical properties were studied,the self compacting concrete cubic compression strength,prismatic compressive strength test,discussed two kinds of relationship between intensity index.

Abstract: This paper focused on the short-term ageing influence on the creep and recovery characteristics of neat and SBS modified asphalt binders at two different stress levels. Using the MSCR test conducted on dynamic shear rheometer (DSR), it can be concluded that the RTFOT short-term ageing process was observed to decrease the nonrecoverable compliance (Jnr) and increase the average recovery percent (R) for almost all binders, which was more notable at a high stress level especially for SBS modified binders. Additionally, stress level applied in test played a key role in evaluating the viscoelastic properties of different asphalt binders, and SBS modified binder exhibited more stress sensitive than neat binders.

Abstract: Though design different of strength of rubber concrete, particle size of rubber, content of rubber, pretreatment methods of rubber, mixing methods of rubber, to study the work performance of waste rubber concrete. The results show that: When doped fine rubber powder to replace the sand is greater than 10% or the outer dosage greater than 20 Kg/m3, the work performance of the concrete mixture is reduced sharply.

Abstract: The experimental using quick frozen method to study the frost-resistance property of waste rubber concrete. Sand was replaced by waste rubber at equal volume substitution ratio divided into 5%, 10%, 15% and 20%; and rubber particle diameter is divided into 2-4mm, 60-80 mesh and 30-40 mesh. The test results show that: the frost-resistance property of waste rubber concrete could meet the specification of design requirements, the antifreeze level is higher than the matrix concrete, and the frost-resistance property improve with the reduce of rubber particle size, the best substitution ratio of rubber aggregate is about 10%.