Applied Mechanics and Materials Vols. 204-208

Abstract: CH4 and CO2 are greenhouse gases. Hence, their emission to the atmosphere must be controlled to avoid the global warming. Dry reforming of methane could provide a valuable tool in alleviating this problem as well as producing synthesis gas. This process is hampered by rapid catalyst deactivation due to carbon deposition and sintering of both the support and active metal. The presented study focuses on the experimental investigation the effect of addition of Calcium promoter to 1%Ni catalysts supported on a mixed 80%α-Al2O3 and 20%TiO2-P25 support. The performance of the developed catalyst was quantified by determining CH4 and CO2 conversions, synthesis gas ratio (H2/CO) and stability. Spent and fresh catalysts were characterized by TGA, SEM and EDS. Time on stream stability tests of the promoted catalyst showed that addition of limited amounts of Ca promoter would reduce carbon formation.

Abstract: Differential Thermal Analysis(DTA) and Differential scanning calorimetry (DSC) were used to study the effect of Bamboo Powder(BP) on the curing behavior of two types of liquefied bamboo-based resol resin(PBF). DTA analysis shows that the addition of bamboo powder to the PBF resin leads to low temperature and broad peaks in the DTA curves. It also accelerates the addition reaction in the curing process of PBF resin and reduced the peak temperature, activation energies for PBF resin . Bamboo Powder reduced the activation energies for resins because the bamboo powder maybe had selfcatalysis effect. The lowest activation energy for a PBF resin probably appeared about at pH 11.0 under alkaline conditions.

Abstract: To analyze the influence of aggregate on shale ceramsite concrete cracks and to compare the crack resistance between shale ceramsite reinforced concrete and ordinary reinforced concrete under the static load, one normal reinforcement beam and seven reinforced ceramsite concrete beams were used to take static experiment by way of two symmetric loading method to get different damages and characteristics of crack beams under load at all levels of distribution.

Abstract: To improve the production capacity, a special area of the wharf’s working face is needed for production and shipment at the construction field of Offshore Oil Engineering (Qingdao, China) Co., Ltd. However, the load acted on the working face increases too much and the bearing capacity of the wharf structure is insufficient. In comprehensive consideration of the construction quantity, period and cost, and to make full use of the present structure, the prepacked aggregate concrete technology is applied to reinforce the rubble-mound foundation and the caissons. With significant improving of the load-carrying capacity, the wharf is available for the new production process. The practical application shows that the technology can be applied to the reinforcement of the gravity wharf. And for very good effect and lots of advantages, it is worth to be widely applied.

Abstract: In this paper, the crystallinity, tensile strength and hydrophility of polytetrafluoroethylene (PTFE) filled with 7wt.% Y₂O₃-ZrO₂ (YSZ) were studied using X-ray diffraction (XRD), mechanical property testing and low-temperature plasma. The results show that the crystallinity gradually increases while tensile strength decreases with the stretch ratio going up; with YSZ content increasing, the tensile strength increases while the crystallinity decreases.

Abstract: The objectives of this paper are to characterize the mechanical properties of porous asphalt pavement mixtures containing RAP and a WMA additive using Super pave gyratory compactor and dynamic modulus testing. Four types of asphalt mixtures were evaluated in this study. This study evaluated compaction energy index, permeability, indirect tensile strength, and dynamic modulus for all types of porous asphalt mixtures. All of the asphalt mixtures meet the typical minimum coefficient of permeability in this study. In addition, only a slight decrease in was found when WMA additive was added to the porous asphalt mixture containing RAP. For indirect tensile strength testing, WMA containing RAP was found to have the highest tensile strength among all of the mixtures tested.

Abstract: Polyurethane prepolymer capped by vinyl group (PUV) was synthesized by reaction of hydroxyethyl methacrylate and toluene diisocyanate using di-n-butyltin dilaurate as catalyst, and then polyurethane-poly(butyl acrylate) hybrid latexes were prepared via miniemulsion polymerization of PUV and butyl acrylate (BA). Fourier transform infrared, differential scanning calorimeter were adapted to characterize the structure of PUV and PU-PBA and the properties of their films. The results show that the decrease of BA/PUV ratio result in an increase of the hardness and glass transition (T_g) of PU-PBA, but reduce the stability of miniemulsion and elasticity of final copolymer films.

Abstract: In order to test the impactions on the strength of the concrete which Use the Shell as aggregate effects of the shell for the aggregate by the use of limited and comprehensive and effective consideration of multiple factors, Use of orthogonal experimental design method to test concrete strength of shells for the aggregate. And then through the systematic analysis of the test results, obtained the proportion of mixture for the best strength.

Abstract: Taking vibration test on 7 shale ceramsite concrete beams and a reinforced concrete beam, collecting the dynamic signals, and modal analyzing it, this paper studies the ceramsite diameter /strength and the injury at all stages impact on the frequency so as to guide the design and construction of shale ceramsite reinforced concrete structures and components.

Abstract: Nitric acid strontium and potassium silicate as raw material, the strontium silicate was synthesized preparation the strontium silicate was synthesized by chemical deposition method， and the strontium silicate was sintered for three hours in 850 °C, 1000 °C and 1150 °C. The effect of sintering temperature on phase composition, microstructure and the influence of purity of strontium silicate was studied using X-ray diffraction and electron scanning electron microscope and differential thermal-hot heavy analyzer. The formation mechanism of strontium silicate by chemical deposition method was analyzed. The results show that: the sintering temperature is effect on phase composition and microstructure of the strontium silicate, Compared with traditional high temperature solid reaction process, the chemical deposition method could greatly reduce the sintering temperature, and improve the powder purity.