Advanced Materials Research Vols. 168-170

Abstract: Foam glass composite with good capabilities was prepared from iron ore tailings as the main material by two steps. The phase composition and microstructure were determined by X-ray diffraction and scanning electron microscopy. The effects of foaming temperature and sintering temperature on sample capabilities were studied by determining sample bulk density and compression strength. The results show that the main phase of basis glass powder is amorphous mineral. The foam glass composite with enclosed circle pore mainly concludes Ca[(Fe,Mg)][SiO3]2 and amorphous glass. The diameter size of pore is wide and distributes evenly. The foam glass composite, whose compression strength is 62.25MPa, and bulk density is 2.056 g/cm3, has fine complex capabilities. With the increase of foaming temperature the sample pore diameter size raises, while bulk density and compression strength reduces. The bulk density and compression strength all diminish firstly and raise subsequently with the sintering temperature increasing. The optima temperature parameters are foaming temperature of 900~950 and sinter temperature of 1100 .

Abstract: The clearance requirement of civil air defense work is a critical question; existing design will lead higher cost and the inconvenience in construction. Through introduction the material properties of HRBF500 reinforced and high-performance fiber reinforced cementitious composites (HPFRCC), calculated the design value of strength and the coefficient of strength for the two materials, provided theoretical for civil air defense work design for the future use HRB500 and the C100 HPFRCC. Based on the practical projects, contrast the frame beam using the HRB335 and C40 with HRBF500 and C100 HPFRCC for reinforcement and cross-section, the results showed that: with the same beam width and same reinforcement, the new material can effectively reduce the high of beams. The combination of these two new materials has a long-term significance in the civil air defense work.

Abstract: This paper begins by discussing the need for damage mitigation for building structures under performance-based design by Wenchuan earthquake. Based on this concept, the character of Engineered Cementitious Composites and the application of the on-site Engineered Cementitious Composites device is discussed. Moreover, a new precast Engineered Cementitious Composites device is suggested. Based on the practical projects, A 6-story frame structure with and without such Engineered Cementitious Composites devices was calculated in 8-degree earthquake zone. The results indicate that Engineered Cementitious Composites devices can reduce the drift angle of the base story from 0.145 to 0.1, reduce the displacement of the top story from 20.23mm to 13.37mm. Engineered Cementitious Composites devices are confirmed to have significant potential as a new structural technology for earthquake resistance and disaster mitigation.

Abstract: The aim of this study is to develop an inexpensive method for preparing transparent and heat insulating tin oxide film. Antimony-doped tin oxide (ATO) thin films have wide variety of technical applications, such as high transmission of visible light and heat insulated coatings. Films were formed by the dip-coating of this colloidal suspension. The structure and morphology of these films were analyzed using XRD and SEM analysis. The optical properties of the ATO thin films were investigated using a UV–VIS spectrophotometer. The heat insulating performance was evaluated using Halogen lamps to irradiate a film coated glass which cover on wooden box for two hours. The results of this study indicate that only the SnO phase (tetragonal rutile structure) appeared in X-ray diffraction, and the Sb dopant does not from a second phase. However, the crystallinity of the SnO structure is impaired by the presence of antimony. For the heat insulating performance the ATO coated glass achieves better heat insulation than that of bare glass.

Abstract: The toughening for UPR composite effect of rigid nano-particles was studied. By the tensile test, it was confirmed that with the increase of the organic rigid particle PA6 and inorganic rigid nano-particles SiO2，toughening effect for the UPR was better. The Generalized Method Cell of the micro-mechanical constitutive of the rigid particles and UPR phase was established. The macro- plastic deformation was simulated by the correlation of parameters for micro-mechanical and macroscopic mechanical, the simulation curves were well fit with its experimental curves。The numerical results indicate that the nonlinear theoretical method can simulate the plastic strain curves of composite well.

Abstract: In order to study the mechanical behavior of recycled fine aggregate mortar, 11 kinds of different recycled fine aggregate replacement rate (ranged from 0% to 100%, level differential 10%) of cement mortar test specimens are designed. The failure pattern and the mechanical performance indexes of the cement mortar under different recycled fine aggregate replacement rate are gained by test. And the different physical indexes of natural fine aggregate and recycled fine aggregate are measured in detail. The experiment findings indicate that because the water absorption rate of the mortar with high porosity is higher, and there are mass microcracks in recycled fine aggregate interior due to damage accumulation, the lower apparent density, the higher water absorption rate and the quicker water absorption speed of recycled fine aggregate are caused. So the fluidity of recycled fine aggregate mortar is fine, but the water retention is bad, the compressive strength is lower than the natural fine aggregate mortar about 50%. But the replacement rate has little effect on the mortar strength.

Abstract: In this paper two different thermal storage material were respectively covered by polymer layer, inorganic layer and simple way to join the concrete. Thermal energy storage and mechanical performance were researched, the reliable use methods of the thermal energy storage in the actual engineer were proposed.

Abstract: The utilization of steel slag as resource is very important in the circle economy of metallurgy industry. Because the composition of steel slag is similar to that of the raw materials of ceramic industry, the sintering process of ceramics with steel slag as one of the raw materials was studied, and the ceramic products of high performance were abstained. Based on the study above, the microstructure of slag ceramic and its effect on the performance of ceramic were studied combining the analysis methods of SEM, DTA and XRD and the software FactSage. It’s found that the diopside phase was formed in the sintering process, which has significant effects on low temperature sintering and ceramic strength improving. Simulation by software FactSage showed that the diopside phase appears when the content of the steel-slag reaches 25%, while the content of slag is higher there are more diopside phase generation.

Abstract: UHMWPE fibers have widely application, but the poor adhesion to polymer matrix limit its development. Polymerization of vapor phase pyrrole on UHMWPE fibers was introduced in this paper for improve the adhesion between UHMWPE fibers and epoxy. The Ppy-coated UHMWPE fiber was studied by SEM, FTIR, DSC and pullout test, respectively. The result showed that there is no chemical act between UHMWPE fiber and polypyrrole. The Ppy coatings have strong effect on the morphological and adhesion property of UHMWPE fiber. The most important, the maximum pullout force was improved after pyrrole polymerization on the surface of UHMWPE fiber.

Abstract: Bamboo structures have a good performance like wooden structures. The flexural performance of glued laminated bamboo beams for bamboo structures were studied through ten large-scale beams tested. The study investigated the failure modes of bamboo beams, flexural capacity, cross-sectional stiffness and strain distribution. In test, four kinds of typical failure modes of bamboo beams include brittle fracture of the bottom fiber, compressive buckling failure at the top of the bamboo strips layers, stratified fracture and oblique tear of the bottom fiber. The control condition of the design load was the cross-sectional stiffness rather than the flexural strength according to the experimental results. The flexural elastic modulus of 10GPa is suggested to check deformation of bamboo beams in the design. The plane-section assumption of cross-sectional strain distribution along the height is verified for bamboo beams.