Applied Mechanics and Materials Vols. 368-370

Abstract: Recycled concrete is the concrete mixed with crush aggregate recycled by waste concrete. This study investigates the effect of long term duration at high temperature on the mechanical properties and behavior of recycled concrete. The result shows that recycled concrete shrank after heating to temperatures below 500°C. Because the silicate aggregates expand over 573°C, recycled concrete expanded at 750°C. Recycled concrete contained the more recycled aggregates, the less expanded. The mechanical behavior of recycled concrete was worse than conventional concrete at treatments below 500°C. However, over 500oC, the resistivity of recycled concrete from construction sites, which contains some red brick, was better than conventional concrete. The property difference tends to decrease with elevated temperature.

Abstract: In order to achieve green building materials, energy conservation, waste reuse purposes. Use city sewage sludge as part of the raw materials for production of shale brick is studied by experiments adopted the different mixing ratio, find matching and the relationship between the compressive strength. Experimental results show that the shale powder to add quality percentage is 40% of dry sludge, formed a burning brick, brick of various performance accord with national standards, not only can save coal and mineral resources, improve the heat insulation brick, but also a lot of recycling of utilization of sludge.

Abstract: Combined with the actual case of Punan highway, Long-life pavement structures are analyzed, and the engineering economic cost benefit ratio method and net present value method are applied for the economic benefit analysis. The conclusion is as follows: The research on the asphalt concrete long-life pavement structure includes a complete set of technology, such as the structure, material, construction and economic benefit analysis, and is a complete research system. We should choose the best solution after we fully consider all the factors affecting the economic benefits when we make the decision-making for the pavement structures.

Abstract: In order to solve the environment pollution of limestone powder during production of limestone manufactured sand and gravel and problem of lack of high quality fly ash or slag powder in ocean engineering, ultra-fine limestone powder was selected for preparation of green high-performance marine concrete containing fly ash and limestone powder and that containing slag powder and limestone powder for tests on workability, mechanical performance, thermal performance, shrinkage, and resistance to cracking and chloride ion permeability. And comparison was made between such green high-performance concrete and conventional marine concrete containing fly ash and slag powder. Moreover, the mechanism of green high-performance marine concrete was preliminary studied. Results showed that ultra-fine limestone powder with average particle size around 10μm had significant water reducing function and could improve early strength of concrete. C50 high-performance marine concrete prepared with 30% fly ash and 20% limestone powder or with 30% slag powder and 30% limestone powder required water less than 130kg/m³, and showed excellent workability with 28d compressive strength above 60MPa, 56d dry shrinkage rate below 300με, cracking resistance of grade V, 56d chloride ion diffusion coefficient not exceeding 2.5×10^-12m²/s. Mechanical performance and resistance to chloride ion permeability of limestone powder marine concrete were quite equivalent to those of conventional marine concrete. But it had better workability, volume stability and cracking resistance. Moreover, it can serve as a solution to the lack of high quality fly ash and slag powder.

Abstract: The purpose of this study is to evaluate the flexural behavior of RC beams with web openings (HPRWO) that are constructed by using square steel tube, fibers and fly-ash. One regular RC beam with openings (HPRS) and three HPRWO specimens were manufactured and tested under monotonic loading. It was evaluated by flexural experiment of HPRWO through comparison of failure mode, load-deflection curves, ductility and ultimate load (V_u). Test results showed that the ultimate load of the HPRFPS specimens were approximately 11.2% to 51.3% better than that of the HPRS, in addition their ductility behavior was better than the HPRS.

Abstract: For projects, especially large-scale projects, due to the long time of project construction, the construction of the complexity of the geological conditions, sometimes inevitably lead to quality defects.How scientific and reasonable quality defects hidden works to take remedial measures, or effective correction to restore the loss of time, cost, quality, safety,become an important engineering problem.Some cracks, will not have a substantial impact on the project, you can take measures to deal with to ensure proper implementation of the project.The article takes the analysis of crack initiation and Treatment in the Suining two station project.There are a lot of reference in processing defects in the country's large projects.Statistical indicators from the implementation of the results, analysis shows that to achieve even better than the regulatory requirements, and achieved the expected results.

Abstract: In this paper, the author analyzes Shu Wang's works from several aspects such as saving resource, protecting the environment and reducing pollution, providing suitable interior space based on the definition of green building. The paper discusses the Green Building properties of Shu Wang’s typical works in both design and construction process and summarizes the corresponding ideas and methods of green architecture design. Relative to the use of high technique trend in the process of green building popularizing in China, the traditional natural method of design and construction is stressed.

Abstract: The current global environmental problems have become increasingly serious, vigorously develop the strategy of sustainable development has become an important issue facing the world, promote the development of green building is the important part of sustainable development. China's energy shortage of building energy consumption serious case, the implementation of energy-efficient green building is an inevitable requirement for China's sustainable economic development.This paper analyzes the concept of green building and features, based on life cycle cost of green building theory and engineering economics theory, a brief study of the costs and benefits of green building, build the environmental benefits of green building evaluation model, provide a theoretical basis for the evaluation of green building environmental benefits.

Abstract: This paper first introduces the current situation of the world housing industrialization, and start from our modern construction techniques to explore the concept of virtual construction technology and its important role in recent years in industrialized construction, virtual construction technology is the future of housing industrialization another direction of development in China.

Abstract: Green and Pollution-Free is Widely Advocated as a New Trend in the Construction Industry Nowadays. the Key Measures for this Technology are Energy Saving, Material Saving, Water Saving, Land Saving, as well as Protecting the Environment during Construction. Green Construction is a Concrete Manifestation of the Concept of Sustainable Development in the Construction Phase, the Implementation of which is of Great Significance to Promote the Sustainable Development of the Construction Industry. Technical Measures on Green Construction of the Project in Huangshi are Described in Detail. these Measures on Energy-Saving and Environmental Protection will have some Reference on the Promotion of Green Construction.