Advanced Materials Research Vols. 374-377

Abstract: With rapid development in automobile industry and increasing environment problems, a difficulty confronting many countries is how to recycle scrape tires. By analyzing the scrap tires directly reclaimed and reused application in landscape engineerings such as Flower Pots, Swings, Patio Furniture, Landscape decoration, Climbing nets, Retaining Walls, Sculptures, Theme parks and more. It suggests old tires can be converted into something truly useful and even valuable and artistic and can be used in simple, cost-effective and environmentally-friendly way.

Abstract: The recycle of asphalt pavement material is not only accordance with the policy of national energy conservation and emission reduction, but also can significantly reduce the project cost. Viscoelastic mechanical model of recycled asphalt mixture is studied based on pavement maintenance engineering of Shenyang-Shanhaiguan expressway, and with analysis of material performance we could collect testing data from bending creep test on small beam, obtain testing parameters through fitting method. The results indicate that general Maxwell model could nicely reflect the viscoelastic mechanical behavior of recycled asphalt mixture.

Abstract: By measuring the heat of hydration during the hydration of water quenched slag produced by molten iron boiler water, combined with water quenching measurements, infrared spectroscopy, X-ray diffraction, differential thermal analysis and electron microscopy observation and analysis, the authors argued that the type of water quenched slag is a kind of potential activity of the vitreous structure. Protective film theory (the surface layer of silicon-oxygen network) is put forward. Therefore, the slag hydration must be excited in the activator destruction of this layer of film, and this hydration process can be divided into three stages. They are: the early hydration of sodium silicate hardening; slag’s surface structural damage and the network structure dissolution and disperse in the early hydration reaction phase; the acceleration of hydration reactions and stable phase in the late.

Abstract: This research is to discuss the durability of retrofit wooden members using carbon fiber-reinforced polymer (CFRP) composites. In order to assure the durability, wooden member specimens wrapped CFRP sheets which were subjected to two different environments including UV and freeze-thaw cycling were tested on surface hardness, compressive strength and flexural strength tests. After the above environment conditions and tests, the evaluation of the effect and the durability of wooden members wrapped with CFRP sheets can be made. Throughout the test, it finally can compare if the wooden members painted two layer resins before wrapping with CFRP will increase the effect of retrofit. Results show that both UV and freeze–thaw tests didn’t cause CFRP obvious degradation to hardness index, compressive or flexural strength. After environment test, it shows good bonding between wooden members and CFRP. The painting epoxy resin quantity of CFRP composites is a decisive factor in successful application as repaired wooden members.

Abstract: In order to meeting high-rise building anti-wind，anti-seismic and land for construction more angespannter situation of urban construction need, introduced a type of new structure which has advantages of seismic dissipation, a great use of materials with high strength and fewer floor spacing：the suspended structure system with huge concrete-filled tubular steel lattice column. Introduced its main structure form, member type and decorate situation by referenced to high-rise building and involved suspended structure theory，ant same time，we state fundamental way and connecting format to this structure system. So we can realize its design features，meditation and innovation case，lay a foundation for spread this new type of structure popularization and application.

Abstract: This paper is an overview of research about the concrete with expanded polystyrene beads as its aggregate in the past. First, a brief introduction to the expanded polystyrene beads concrete is given. Then, the researches of these years is presented and discussed, and the important studies are described in detail. Finally, the paper gives a summary of the research status and prospects of expanded polystyrene beads concrete.

Abstract: This paper describes the development of cutting machine with multi-axis control for raw building model in detail. The cutting machine is integrated the MACH3 numerical system to control the three axis and while temperature of wire and move rotation are controlled by wireless remote unit. The design of interface circuit, servo motor driver circuit, wireless remote circuit are given in this paper. The state instruction circuit of cutting machine’s is presented. The fact shows that the application of this cutting machine for raw building model has obtained very good effect.

Abstract: Based on the experimental research, the prism compressive strength and cubic compressive strength of specified density steel fiber concrete are studied. Through regression analysis, the influence of type of steel fiber, volume content of the fiber and substitution ratio of lightweight aggregate is studied. According to the test results, the formula of prism compressive strength and cubic compressive strength is given.

Abstract: The regulation of sulfate irons in concrete was determined by spectrophotometer under different conditions, and the comparison between dissolve acid method and weight method was used to determine sulfate irons in this paper. Results show that if the volume of solution is the same, sulfate ions content in concrete decreases with the increase of sample quality, and stabilizes finally. If the sample quality and the volume of solution is the same, sulfate ions content in concrete increase with the increases of temperature, and stabilizes finally. If the soak period is the same, sulfate ions content in concrete gradually become stable. Results show that the sulfate ions content in concrete approximately follow linear distribution by use of spectrophotometer method and the weight method.

Abstract: Concrete is one of the most widely used engineering building material. Using waste concrete to produce recycled aggregate applying in concrete has been highly valued in developed countries, and has achieved significant economic and environmental benefits. China's current large-scale urban construction and road network renovation throughout the country generated a lot of waste concrete, but the technology about the recycled concrete is not widely used. In this paper, from the use of recycled concrete technology, production costs and environmental benefits and other aspects of social, evaluated the recycling using of waste concrete.