Applied Mechanics and Materials Vols. 361-363

Abstract: Elaborated commonly used asphalt Classification and characteristics of flame retardants and flame retardant mechanism. In view of the present situation of the application of flame retardant asphalt, this paper puts forward the problems existing in the current research and development direction. By comparing the type flame retardant, flame retardant fibers and other mineral powder, fiber flame retardant effect, summarizes their advantages and limitations.

Abstract: Combined with the field tests of CFG (Cement Fly-ash Gravel) pile-net (geogrid) composite foundation in Danyang Test Section of the Beijing-Shanghai High-speed Railway, the settlement, pile-soil stress ratio and additional stress of composite foundation were analyzed by numerical simulation. It shows that the pile-soil stress ratio of CFG pile-net composite foundation is in the range of 4 to 6. And the reasonable distribution of additional stress in composite foundation is also discussed. The results can provide references for the design of the CFG pile-net composite foundation under embankment in high-speed railway.

Abstract: Using different gradations and different fine aggregates and different molding methods for molding specimens, and calculates the sample porosity, and analyzes the cause of increased porosity of mixture from different aspects. The results show that: the same aggregate and the same gradation, the use of Gyratory Compactor and the Marshall designed method form the small different porosity specimen;

Abstract: With the rapid development of electronic information technology, computer technology, and space technology, the highway surveying technology and virtual scene in the design of the road become more and more important. The traditional road survey and design is mainly the flat-type design. The design made in this way is the two-dimensional one. Only by making the design to a road can we see the overall effect of the road design. The theoretical basis of the research will be found from the original road survey and the static graphic design will be made into a dynamic visual design by the use of model software. Through the concept of conversion, we can make the static design of the road into the dynamic design. By modeling the design and dynamically analyzing, we can analyze, improve and modify it when imitating the dynamic design. This is a modification of the virtual kind and can timely, accurately analyze the quality of the outcome of the study design. Therefore, the combination of virtuality and reality of the road design will become the mainstream trend.

Abstract: Rutting is one of the most hazardous damage form of asphalt pavement.But,owing to itself inherent in the viscoelastic characteristics of asphalt mixture,the diversity of factors influencing the high temperature of asphalt pavement anti-rutting performance and The complexity of rut formation,this three reasons make ruts become a worldwide problem.Starting from the mixture, This article analyzed the influence factors of the rutting resistance of asphalt mixture at high temperature.For asphalt mixture, through the experimental data, the research status at home and abroad, from the type of asphalt, asphalt content, grading of aggregates and air voids four aspects analysis and study the influence factors of the stability of asphalt mixture at high temperature.

Abstract: AH-130 base asphalt graded according to the upper limit of AC-16 close gradation is selected in this paper to identify the impact of asphalt mortar of different filler-bitumen ratios on asphalt mixture’s road performance through small beam bending test at low temperature. And then bending failure energy, in substitute of bending strength, bending strain, is used to evaluate the anti-cracking performance of asphalt mixture at low temperature.

Abstract: In order to accurately simulate the combined action of rainfall, high temperature and sunshine effect on asphalt mixture, the experiment of water-temperature-radiation circulation was designed. The changes of air void, split tensile strength, freeze-thaw splitting tensile strength and dynamic stability were quantitatively analyzed under the condition of different asphalt-aggregate ratio and different striking times during water-temperature-radiation cycle. Grey correlation analysis method was used to analyze the influence factors of the four parameters mentioned above, and comprehensive correlation was put forward to evaluate the influence factors of mechanical properties of asphalt mixture. It is proven that, the cycle index of water-temperature-radiation is the main factor. The striking times and asphalt-aggregate ratio influence mechanical properties of asphalt mixture less than the cycle index, and the initial void influences least.

Abstract: In order to study the different influences of mine filler and diatomite on asphalt mortar performance, asphalt mortars with 7% mix amount of mine filler and diatomite were tested for apparent viscosity at 135°C, penetration value at 25°C, and softening point. PI and PVN were used to evaluate the temperature sensitivity of the two kinds of asphalt mortars as well. Further, asphalt mortar bending test at low temperature were done to verify the good mechanical performance of diatomite asphalt mortar. Results indicate that, compared to mine filler, diatomite has stronger modified effect on asphalt, including apparent viscosity, penetration and softening point. And diatomite is more conducive to weakening temperature sensitivity of asphalt mortar. In addition, bending test indicates that diatomite asphalt mortar is more conducive to upgrade low temperature performance. Thus, it is significant for the preparation of diatomite modified asphalt concrete on the design of grade mixing ratio, so as to be conducive to promoting the use of diatomite modified asphalt concrete.

Abstract: In this paper, an interactive monitoring system for real-time, dynamic and multi-dimension monitoring of highway engineering by utilizing the current 3G network has been proposed innovatively after analyzing the characteristics of highway engineering construction. It has been applied into a transformation project of a certain national road and achieved fine results. It can provide a convenient and low-cost plan for the informationization and intelligent construction of highway engineering.

Abstract: This paper examines theoretically the possible mechanical response changes on both bituminous pavement structure using linear elastic method, the change regulation of deflection,stress on the bottom of base and subbase and compress strain on the top of subgrades between semi-rigid base and flexible pavement pavement. In the load application procedure, a dual wheel with the a series of pressure was chosen.The results have shown that the deflection tensile stress and subgrade compressive strain on the surface increase with the increase of axle load and they would result in serious effect of overloading on the earlier damage of asphalt pavement.