Applied Mechanics and Materials Vols. 716-717

Abstract: Advantages of precast concrete structures were very obvious, these were the sign of industrialized construction, while also reducing costs, energy conservation, and improve quality. In recent years, the demand of precast concrete buildings was also increasing. BIM technology was advanced technology, the design of precast structures, such as the frame shear wall structure, was given by using BIM technology in the complete process; Design process and value of the application of the BIM technology in the prefabricated structure were analyzed, Prospects of the BIM technology using in prefabricated structures were discussed.

Abstract: Currently deepen design of prestressed concrete structure exists various problems, them can be solved using BIM building digital technology in the deepen design phase of prestressed concrete structures, such as constant correction of the two-dimensional drawings. BIM technology was advanced technology, the design of prestressed concrete structures, was given by using BIM technology in the complete process; Design process and value of the application of the BIM technology in the prestressed concrete structure were analyzed, Prospects of the BIM technology using in prestressed concrete were discussed.

Abstract: This paper analyzed for common diseases treatment methods for cement pavement in Jilin province seasonal freeze-thaw area, based on the analyses, disease prevention and repair methods have been put forward for water deposit, fracture, dislocation, potholes, arch, plate corner crack and uneven settlement, the research results have certain reference meanings for cement pavement maintenance.

Abstract: Service area of Mount Wudang is located in the west of Hubei Province of Fuzhou-Yinchuan expressway. Though owning a large number of cultural and geographical resources, its functions and characteristics have not been fully developed because of some geographical reasons. This paper comprehensively analyzes the current overall status of the service area. Drawing on the advanced domestic and foreign management experience in construction of expressway service area and service demand of modern highway, this paper repositions the construction, operation, management and service of this service area and puts forward some reconstruction planning and assumptions with more regional characteristics and time demands.

Abstract: This study starts with analysis of interaction mechanism of tire and pavement to analyze the factors influencing anti-skid performance in pavement surface characteristics and confirm pavement characteristics related to anti-slide performance. Besides, this paper further analyzes the effect of surface coating on pavement anti-skid performance. The specific experimental study mainly concentrates on raw material selection and evaluation and the study on the performance of different particle anti-skid pavements. This paper also measures friction coefficient of anti-skid section of the extension line of Beiyuan Avenue within the use for one and a half years. The degradation model is set up to evaluate pavement performance degradation. Further, this paper estimates Jinan the service life of the experimental section of coating-type color anti-skid pavement and carries out benefit analysis and development prospect.

Abstract: The high temperature of asphalt concrete pavement decreases its bearing capacity, thus leading to serious rutting. In this paper, a coated thermal resistance/heat reflection pavement construction technology with a coating of 2-3mm on the asphalt pavement is mainly introduced, which can reflect and prevent sunshine and reduce the surface temperature of asphalt pavement for the purpose of preventing rutting. In addition, the coated thermal resistance/heat reflection paving method is introduced, which is of certain reference to the promotion and application of coated thermal resistance/heat reflection pavement.

Abstract: In order to quantitatively detect the compactness of bellows duct grouting, by studying time-histories relation curve forming by ultrasonic wave transmitting in different thicknesses concrete samples. We get the acoustic time rule after ultrasonic passed through different compactness bellows duct. At the same time, establishing empty hole estimation model corresponding to the concrete samples and providing theoretical basis for judging porosity and predicting the grouting quality in the bellows duct. Meanwhile, dividing the bellows duct into five degrees complete compactness, 3/4 compactness, 1/2 compactness, 1/4 compactness, empty by setting up defects in the bellows duct, and then embedding them in concrete slab to do ultrasonic detection. The detection result shows that ultrasonic detection method can effectively quantitive estimate the grouting quality of prestressed bellows duct with establishing empty hole estimation model.

Abstract: In order to solve the incompatible problems between each evaluation index when evaluated,the superiority evaluation method was applied in the process of Bid Evaluation of architectural engineering. Using the CRITIC method to determine the weight coefficient of each index , which take into account both the contrast intensity between the indexes and introduces the correlation between indicators to determine the weight coefficient, so that more objective. Calculating the bidders value of superiority degree and maximal is selected as the most suitable bidder, results show that the method is relatively objective evaluation, the calculation is simple and practical.

Abstract: Combining with digital image processing and numerical simulation technology, X-ray computerized tomography (CT) was used to study the microstructure of asphalt mixture for analyzing internal structure of asphalt mixture. The microstructure modeling methods of asphalt mixture can be classified as continuum-based numerical method and discontinuum-based numerical method. This paper described a review of the work done by many researchers on the modeling of asphalt mixture. The simulation methods are included finite element network model (FENM), a micromechanical finite element model (FEM), a clustered discrete element model (DEM), disturbed state concept (DSC), DDA (Discontinuous Displacement Analysis), numerical manifold method (NMM) and meshfree manifold method (MMM) that were used in micromechanical modeling of asphalt mixture.

Abstract: Foundation subsidence is an important factor affecting the life of the highway, as well as one of the important evaluation indicators of the foundation disposal measures. In this paper, by selecting typical foundations of Jile express highway, FLAC3D was used to simulate the natural foundation settlement under different subgrade height considering the impact of groundwater levels in the Yellow River flood area. The relationship between the time T (Month) from subgrade construction completed to stabilization and the subgrade height H was found as: T=0.36H²-1.63H+33.47, and the appropriate value of time was got to be placed under different circumstances.