Applied Mechanics and Materials Vols. 395-396

Abstract: The physical properties of waste concrete recycled aggregate according to the mixing ratio of the coating agent and the number of coatings investigated in this study. As the result, the Density of recycled aggregate increased, as the mixing ratio of the coating agent and the number of coatings increased. The percent of water absorption decreased rapidly for all coating conditions, and potential contamination test showed that among 21 items of concern, five were detected. The compressive strength of the water-permeable concrete increased by approximately 16.2% as produced with coated recycled aggregate.

Abstract: In the double-tube parallel tunnel excavation cross-range, it will result in a larger superimposed surface subsidence, and even induce land subsidence to cause the accident. This paper uses the finite difference FLAC^3D software to have a numerical simulation on double-tube parallel tunnel excavation of Dalian Spring Street Station. The land subsidence law of a double-tube parallel tunnel excavation which is obtained by analyzing the vertical and longitudinal settlement curve can predictable similar ground subsidence caused by tunnel construction and guide the safety construction of practical engineering

Abstract: The FRP materials can be divided into FRTP( fiber reinforced thermoplastic plastic) and FRSP( fiber reinforced thermoset plastic) according to the resin materials. As a new kind of composite, FRTP attracts people. s attention for the characteristics of light weight, durability, no environmental pollution and reshaping. According to the characteristics of FRTP, we compare the impregnation and moldinging process of FRTP materials and the physical properties of FRTP and FRSP. We study the FRTP laminates products for civil engineering and its mechanical properties and the application situation at home and abroad. Some problem to be solved are also presented.

Abstract: Fiber reinforced polymer ( FRP) rods have a broad application in civil eng ineering field used as a material substiting steelbars. Based on the domestic and abroad research, the durability of the fiber reinforced polymer (FRP) rods undermultifarious environmental conditions is summarized in this paper, and the effect of environments such as temperature, humidity, corrosion from acid, alkaline and salt solutions on durability performance of FRP materials as well as the degradation of the bond characteristics between FRP rods and the interface of concrete caused by the acceleration environment test are mainly discussed. The results indicate that the environmenta lconditionsm entioned above affect FRP rods and bond characteristics between FRP rods and the in terface of concrete.In addition, a relatedmodel predicting the influence on durability of FRP rods in alkaline solutions is given and future study trend on durability of FRP rods is presented

Abstract: Based on a large number of core description, combined with indoor rock thin section analysis,cast thin-section pore character analysis ,microphotograph and scanning electron microscope observation, the diagenesis of the volcanic rock of Yingcheng formation in Yaoshen area were studied in detail. The results show that there are 5 kinds of diagenesis types in Yingcheng formation, among them, the dissolution, structure effect have a decisive influence on the formation of reservoir pore; reservoir space evolution has four stages in all, diagenesis has a great influence on reservoir space evolution.

Abstract: Gu 83 wellblock is the center of the Gulong reserves, the well test oil yield is high, the oil-bearing area shall, as reserves and production increase nine oil production company of Daqing oil field replacement area. On the basis of high resolution sequence stratigraphy theory, strata as the instruction, the trunk section and the well combination method is used to contrast layer and multiple well profile compared to small layer, establish high resolution stratigraphic framework. The Putaohua reservoir is divided into three sandstone under the group, which, subdivided three eight small layers for sandstone. Through well combine to determine the sequence division of the interface, divided into Putaohua reservoir. Considering lithology, curve characteristics of shaft vibration, even the well profile correlation research area according to the principle, method, sequence division division, in the Putaohua oil layer, three sets of sandstone under the group; On the segmentation, each group sandstone, upper sandstone will eventually set is divided into two layers of P11, P12; middle sandstone is divided into P13, P14, P15 three small layer; under sandstone under group is divided into P16, P17, P18 three small layer.

Abstract: Comparing the activity of ground phosphorous slag (GPS) from five different areas in Sichuan province, the effects of fineness and content of GPS on cement mortar strength were studied. The results showed that all GPS produced in Sichuan complied with GB/T26751 and JC/T317 for activity requirements. With GPS dosage of 30%, the 28-day strength of cement mortar grew with the increase of specific surface area of GPS; within the dosage of 0~50%, as the dosage rose, 28-day strength of cement mortar first went up and then down, reaching the peak at 30%. When used as mineral admixtures in concrete, specific surface area of GPS is preferably 3500~4500 cm²/g, and its dosage should not exceed 30%.

Abstract: It is a problem on building energy efficiency of how to improve the heat insulation performance of building envelope, to make the building outer wall has good heat preservation effect, and to keep the necessary seismic performance. Exterior wall thermal insulation engineering, which is a key part on building energy conservation engineering construction quality acceptance and on building energy efficiency design, is an important part in building energy efficiency projects. Therefore, it is necessary to study the seismic performance based on the fact that the building is building energy efficiency. By the research on exterior insulation materials, the analysis on the performance of external thermal insulation materials currently used, and the research on the factors affecting the seismic performance of external thermal insulation material, It provides a guidance on evaluating the external wall thermal insulation material performance and quality, ensuring the quality of external thermal insulation material, and it is expected to achieve the effect of building energy efficiency.

Abstract: The vibrating inserting rod Long Auger Bored pile is a new technology of pressure grouting pile based on the development in the long spiral drilling. On the basis of introducing the method of traditional slurry drilled pile, this paper analyzes advantages of the vibrating inserting rod Long Auger Bored pile, the construction process and key points in detail, summarizes the causes of common quality defects of the vibrating inserting rod Long Auger Bored cast-with-pressure and their solutions.

Abstract: The interaction of a double-tube parallel tunnel excavation will greatly influence on underground pipeline of its region. This paper, taking Dalian Spring Street subway station as the background, uses the finite difference software to establish 3-D finite element analysis model to simulate the effects of tunnel excavation on underground pipeline, in which different embedment, material properties and diameters are considered. By analyzing of the settlement and deformation law of pipeline, the least affected pipeline conditions are drawn to provide corresponding guidance for subsequent underground projects.