Applied Mechanics and Materials Vols. 174-177

Abstract: This paper reviews the application and development of phase change materials in wall, floor, concrete, points out its advantages and disadvantages, provides reference for phase change materials applied in practice.

Abstract: In this article, the polydimethylsiloxane (103-PDMS) membranes filled with nanoscaled SiO2 particles were successfully prepared by polydimethylsiloxane (103-silastic) The effects of silica content, feed concentration, and feed temperature on the pervaporation performances of the 103-PDMS membranes were investigated for recovering propylene glycol methyl ether (PGME) from aqueous solution by pervaporation. It was found that adding the nanoscaled silica particles significantly improved the pervaporation performances of the 103-PDMS membranes. In addition, the possible causes were basically investigated by environmental scanning electron microscope (ESEM).

Abstract: Through experiments based on three different graduations of regenerating concrete,the paper analyzes the parameters variation characteristics, such as performance of the density, water absorption, moisture content, packing density and crushed indicators.The research shows that Pressure loss of the quality of the regenerating concrete is proportional with loading force. What’s more, it can also reflect the own strength grade of aggregate in a more direct way and should be a new method to assess aggregate strength. Simultaneously, it gives us a relatively superior graduation and provides reference value for guiding actual project.

Abstract: Plate-cone reticulated shell is a new type of space structures with good mechanical behavior and technical economy. Composite material plate is light and strength is high, its ratio intensity is higher a lot than steel material, and elasticity property can be designed, so composite material plate specially applies to prefabricated cone unit of plate-cone reticulated shell. In this paper, GRP plate is regarded as linear elastic material from a view to the engineering application, the multi-layer plate element stiffness matrix is derived with the classic theory of plate and shell, and the GRP plate is designed with equivalent method. Furthermore, the static characteristics for plate-cone reticulated shell with composite material plates are also analyzed in the paper. It is proved by the study that plate-cone reticulated shell with composite material plates is more advantageous and has wide application foreground.

Abstract: The article carries out laboratory experimental research about fatigue performance of two gradation of foamed bitumen and emulsified asphalt cold recycled mixture, and analyzes experiment results by using fatigue statistics theory, on this basis the paper has been obtained a reliable fatigue equation, and makes a comparative analysis of the fatigue performance of cold recycled mixture and hot-mix asphalt mixture.

Abstract: The fibers were converted to nano-scale cellulose fibers by chemical and mechanical treatment in this paper. FT-IR spectroscopic analysis demonstrated that hemicelluloses and lignin were removed during the chemical process. After that, ultralsonication method was carried out to refine cellulose fibers to cellulose nanofibers (CNFs). The filtered CNFs film was freeze-dried. Scanning electron microscopy (SEM) images reflected a very high aspect ratio of single cellulose nanofiber was over 1000. The nanocomposites were fabricated to be transparent attributed to the good morphology of the nanocellulose. From the SEM images of fracture surface of nanocomposites, excellent distribution had been found in the nanocomposites. Elastic modulus of the nanocomposite film was determined through tensile test, which was typically higher than pure acrylic resin. Therefore, the obtained transparent nanocomposites with superior flexibility have the potential to be used as the base substrate for organic light-emitting diode display (OLED).

Abstract: Calcined coal gangue was used as active addition of magnesium phosphate cement (MPC). Influence of calcined coal gangue addition on the setting time, mechanical property, mineral phase, and microstructure of MPC had been studied. The prescription was designed as following: the ratio of mono ammonium phosphate to magnesia was 0.25 in mass, additive amount of calcined coal gangue was 0%, 10%, 20%, 30%, 40% to the total mass of magnesia and mono ammonium phosphate respectively, borax additive amount was 0.06 to other raw materials. The result show that calcined coal gangue could extend the final setting time and improve the early strength of MPC. The MPC obtained its maximum compressive strength of 94.9 MPa and 95 MPa with the calcined coal guage content is 0% and 10% respectively. The particles of calcined coal gangue powder filled in the voids of cement matrix as framework and had effect on microstructure. Furthermore, calcined coal guage might participate the hydration reaction in a long age and form a cementing product which result in improvement of MPC’s long time strength.

Abstract: determination of the optimum asphalt content usually associates the Marshall Index with volumetric parameters for hot mix asphalt (HMA). Because unreasonable volumetric parameters may result in the asphalt content being more or less so that performance of HMA are influenced. Therefore in this paper, relationships between volumetric parameters and the Marshall Index were studied for two kinds of gradations, AC25 and AC13, which for each kind of gradation, according to the orthogonal test method, the pass percentages of aggregate between the each sieve size and the usage of asphalt contents were changed to form 50 sets of asphalt mixtures for the Marshall test and the volumetric parameters experiment. The results show that rank of influence significance of volumetric parameters on the Marshall Index is Gmb and VV, then VMA and last VFA. However, for fine aggregate (AC13) asphalt mixtures, as Gmb increases, all the MS and the FL increase. Meanwhile, as VV increases, the MS and the FL of AC25 asphalt mixtures increase, whereas for AC13 asphalt mixtures the MS decreases but the FL increases. So for proportion design of fine aggregate (AC13) asphalt mixtures, the fine aggregate and the asphalt content must be strictly controlled to meet the VV requirement and to avoid asphalt pavements to become over-densified. In addition, with VMA increases, for course aggregate (AC25) asphalt mixtures, MS and FL increase, but for course aggregate (AC13) asphalt mixtures, MS decreases but FL increases. Otherwise, the influence of VFA on MS and FL could be nearly ignored.

Abstract: Microstructure and interaction of soil matrix with acrylic acid sol was studied. The effect of acrylic acid sol and soil loading in composites has been investigated.The SEM results indicate the formation of an intercalated structure.The mechanical properties of the composites are characterized. The dispersed acrylic acid sol improves the hardness and elastic modulus of the soil matrix systematically with the increase of acrylic acid sol loading.

Abstract: Zn2SnO4 hierarchical architectures were synthesized via a solvothermal method. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the products were composed of a mass of nanoplates. The forming process of Zn2SnO4 hierarchical architectures was discussed and the proposed mechanism was put forward in this work. The photocatalytic activity of Zn2SnO4 structures was evaluated by the degradation of RhB aqueous solution and the results showed that hierarchical architectures had good photocatalytic property.