Advanced Materials Research Vols. 753-755

Abstract: Lightweight technology application in river-crossing and military bridge equipment has important significance to promote rapid development. Lightweight can efficiently reduce the weight, promote structure optimization and improve performance of the river-crossing and military bridge equipment. After basic principles and main technologies of the lightweight application in the river-crossing and military bridge equipment components are summarized, strength design technologies for the lightweight of the equipment components are discussed, and simple shape components strength design criteria under tension/ compression, bending, shearing and torsion are analyzed, which is extended to general lightweight components strength design criteria. On the basis of the lightweight design principles and strength design criteria, appropriate design methods and optimization strategies are selected, suitable lightweight high-strength material is chosen according to research and development demands, and the lightweight purpose for the river-crossing and military bridge equipment is realized.

Abstract: Dynamic viscosity, toughness and tenacity were used as the key indicators combined with conventional asphalt indicators such as ductility, penetration, softening point to evaluate the modification effect. The change laws of the indicators influenced by the dosages of polymer, compatilizer and stabilizer as well as the modification mechanism were analyzed; and the dosages of the three modifiers were determined. The results indicate that the modification effect is strongly influenced by the content of modifiers. Each of the modifiers plays a unique role in the performance the high viscosity asphalt. Through a particular modification technology, the optimum dosages of polymer, compatilizer and stabilizer used in self-modified high viscosity asphalt were determined at 7%, 3% and 2% respectively.

Abstract: As a kind of high performance concrete, light aggregate concrete has the following advantages, for example lightweight high strength, thermal insulation performance, seismic performance, refractory, penetration-proof performance and so on. This experiment with EPS particles which are made of ceramsite and waste polystyrene foam plastic as light aggregate and fly ash as admixture prepare light aggregate concrete, research the influence of polymer and organic fiber on the strength of light aggregate concrete, and analysis of the microstructure and mechanism, the experimental results indicate that polymer and organic fiber can effectively improve the microstructure of light aggregate concrete and the interface of light aggregate and cement paste, significantly improve the strength of light aggregate concrete and reduce its brittleness.

Abstract: Framed-Ground Floor Structure for short which has serious seismic damage and high collapsed rate, is the unreasonable structure system. The experiences is 1. The shear wall can be increased to improve stiffness of weak layer. And designer should try to arrange the walls equably. 2. In order to avoid stiffness mutation, stiffness ratio between ground frame and transition layer can be adjusted. 3. Collapse resistant design of Framed-Ground Floor Structures should be emphasized. Then seismic response analysis is conducted by ANSYS. And the seismic response is little, and strength damage or stable damage do not occur for the little acceleration peak. Along with the increasing acceleration peak, The bigger horizontal displacement leads to damage of Framed-Ground Floor Structures. Moreover, the damage is in advance as the increasing acceleration peak.

Abstract: The thermal insulation mortar with cinders and phase change materials which is made from expanded perlites adsorbing composite phase change material, cinders and vitrified small ball as lightweight aggregate has the characteristics of both energy storage and thermal insulation. In this paper,we studied the effect of redispersible emulsion powder, methyl cellulose ether, organic fiber and water-reducing agent on the performance of thermal insulation mortar with cinders and phase change materials. The result showed that all the performance met the national standards of the thermal insulation mortar.

Abstract: The paper takes into full account of the convenience and safety of outer-wall external thermal insulation system, and investigates the technical parameters of rock-wool. The study provides two kinds of construction methods for the system which are rendering and anchoring . In general, galvanizing steel-meshwork using machine anchors could use all kinds of rock-wool panel made in China. The interface mortar used for rock-wool could protect workers hands and improve the integrity and anti-crackness of the system. Both of these two kinds of rock-wool systems could resolve the difficulties of current rock-wool panel application in outer-wall external thermal insulation system. The rock-wool external thermal insulation which has surfficient fire-proof capability could apply in many kinds of buildings, especially high-rise buildings.

Abstract: The corrosion behavior of rebar HRB400 in 3.5 wt.% NaCl solution was investigated, and the tensile mechanical properties after corrosion were tested. The results showed that, with the increase of corrosion time, the corrosion rate of rebar HRB400 increases and the corrosion becomes heavier. Meanwhile, the yield strength and tensile strength decrease, but the elongation increases at first and then decreases.

Abstract: Taking a flyover as the background, this paper compares two reinforcement scheme, and ultimately chooses the paste carbon fiber polymer method to reinforce the bridge. It calculates and analyzes the structure before and after the reinforcement, then compares the stress state , shear load-carrying capacity and flexural capacity. At last ,it evaluates the effect of the paste carbon fiber polymer method and puts forward some suggestions.

Abstract: The effects of amounts of the kiln dust-activated coal gangue on the setting time and compressive strength of high-content slag cement were investigated. The performance of sulphate resistance of cement with 30 wt.% kiln dust-activated coal gangue was evaluated. The results reveal that the setting time of high-content slag cement is prolonged. Appropriate kiln dust-activated coal gangue amounts can increase the compressive strength, while too much activated coal gangue (>30 wt.%) leads to the decrease in compressive strength. Cement with 10 wt.% kiln dust-activated coal gangue exhibits a good compressive strength. The performance of sulphate resistance of Portland cement with 30 wt.% kiln dust-activated coal gangue is distinctly enhanced, while that of high-content slag cement is improved to some extent.

Abstract: The paper focuses on studying thermal behavior of the historical dwellings in southern Hunan. The field assessment was conducted based on the analysis of the space temperature, comparing the physical environment in different locations, as well as researching the sunshade of lanes and eaves. The results show that the thermal behaviors of the historical dwellings are meet ecological standards. The technology can be regarded as an excellent construction experience and it has a direct influence on local building environment. By assessing our traditional village with modern technology, we can know of the builders wisdom on how to work with nature and save resources.