Applied Mechanics and Materials Vols. 204-208

Abstract: With the development of economy, architectural form constantly update and development. High-rise buildings, long-span buildings, and Giant buildings are constantly emerging. Building function becomes more and more complicated and diverse. Furthermore, people's aesthetic requirement continues to improve, which makes the glass more and more widely used in public building. Because it is lightweight and transparent, glass has received more and more architect's favor in the modern architecture design.

Abstract: This paper introduced the current situation of building templates, and compared several new building templates. Through the analysis and prospect of plywood templates, we put forward that development of templates should integrate into advanced technology to adapt the promotion of modern construction technology.

Abstract: The hydration performance and pore structure of fly ash-cement (FC) pastes were investigated by means of XRD, TG, ex-situ leaching (ESL) and MIP. The results reveal that the influence of curing age to the kinds of hydration products of FC pastes is unconspicuous. As the content of fly ash increase, the Ca(OH)2 content decrease gradually. However, the content of Ca(OH)2 left in every paste is almost constant after 28d, regardless of the replacement ratio of fly ash and water-binder ratio. The decline of alkalinity of pore solution is not endless, even though the contents of fly ash in FC pastes is very high(65%).The incorporation of fly ash in proper ratios could increase the ratio of harmless pores and improve the microstructure of the FC pastes. Ca(OH)2 was not consumed heavily or exhausted when cementitious material was hydrated due to the low reaction degree of fly ash.

Abstract: In this paper, the tensile properties of JLF-1 steel at strain rate of 0.1%/s and 0.02%/s were studied from room temperature to 873K in vacuum using engineering specimens. The strain rate does not affect YS, UTS and RA as far as the tests performed in this study. Strain hardening of JLF-1 steel decreased significantly above 673 K, RA also increased rapidly above 673 K; and the surface fractography was changed from shear fracture below 673 K to dimple fracture at 773 K and 873 K. That means JLF-1 steel becomes perfect elastic-plastic body (without strain hardening) and ductility improved with temperature increase.

Abstract: Polycarboxylate superplasticizers have become the superstar for high-performance concrete. Because their molecular structure can be easily manipulated by impart new materials to acquire new performance. In this paper, the synthetic parameters adjusting experiment is utilized to get the optimal synthetic formulations. The reaction control factors and polymerization mechanism are also discussed. After characterization, we concluded that the expected performance of polycarboxylate superplasticizer could fabricate through radical graft copolymerization reaction by molecular designing.

Abstract: Low temperature crack plays an important role on the road safety and comfort. Indoor experiments were carried out to study the crack resistance of asphalt mixture. The results show that: fiber and SBS modified asphalt can increase the failure strain energy, the failure stress and the failure strain and reduce stiffness, thus can significantly improve the anti-cracking ability at low temperature; at a critical temperature of about -10°C, the splitting strength achieve a peak value correspondingly, and the asphalt mixture transforms from the viscoelastic status to the brittle status; the failure load and the failure strain of the three kinds of mixtures are in the sequence of modified asphalt mixture> fiber mixture> common asphalt mixture; the results of the J-integral strain energy test show that fiber asphalt mixture has the maximum resistance curve slope, which means it may have better anti-cracking ability than the SBS modified asphalt mixture; the fracture stiffness can be introduced to effectively evaluate the crack resistance of asphalt mixture.

Abstract: Based on the method in Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering, the unconfined compressive strength, the splitting strength and the resilient modulus were tested to research the mechanical properties of solidification agent stabilized iron tailing gravel. Meanwhile the influences of solidification agent content and curing age on the mechanical properties of solidification agent stabilized iron tailing gravel were investigated. The results show that solidification agent stabilized iron tailing gravel has better mechanical properties. The mechanical properties of solidification agent stabilized iron tailing gravel conform to the current specification, so it can be used as highway sub-base material.

Abstract: Shale ceramsite concrete is a kind of light weight aggregate concrete. In this paper shale ceramsite concrete compressive strength properties are studied by experimental preparation of different water cement ratio, and made an analysis of compressive strength comparatively among 7 days, 28 days, 56 days. The result shows that the rules of compressive strength of shale ceramsite concrete are in line with the general law strength of concrete, and increases with the age increasing, decreases with water cement ratio increasing, but they are not entirely linear relationship.

Abstract: In order to study the effects of different factors on the performance of crumb rubber modified asphalt, on the basis of many laboratory tests, this article analyzed such factors as types of crumb rubber, fineness, content, mixing temperature and matrix asphalt. Results show that mixed with the crumb rubber, pavement performance of the asphalt has been improved to varying degree. In the engineering application of rubber asphalt, it is suggested that the 20 mesh crumb rubber modified asphalt of truck tire be adopted, with about 16% to 18% of crumb rubber content at about 175°C. As for matrix asphalt, it should be selected according to the different climatic conditions and the mechanical characteristics of the pavement.

Abstract: Influence of DC and steep front impulse injection on space charge of PP by thermally stimulated discharge current (TSDC) are studied. The experimental results show that space charge of PP is almost irrelative to the rise time of pulse, but space charge has relationship with polarized field intensity and polarized time, which is similar to the theory of TSDC