Advanced Materials Research Vols. 953-954

Abstract: This paper analyzed characteristics of different energy consumption quotas development method focusing on building of green campus as our sustainable development demand and pointed out the development of energy consumption quotas by colleges and universities based on building area per student per stage by use of regression analysis, gaved out the corresponding ratings ,and proposed that correction coefficient should be developed based on properties, scientific research ability and scientific research funds of colleges and universities.

Abstract: With the demand of improving the second interfacial bonding strength and environmental protection, MTC cementing technology has obvious technical and economic advantages. However, due to containing lots of low-density materials and slurry treating agents, which make low strength, the application of low-density slag MTC cementing slurry system is restricted in the cementing of deep wells and low-pressure leakiness formations. According to the theory of particle distribution and based on particle size analysis of floating bead, micro silicon and slag, solid-phase proportioning design of low-density (1.35~1.55 g/cm³) slag MTC was carried out in this paper. By adjusting the adding amount of micro silicon and activators, the slag MTC cementing fluid system with the 24-hour compressive strength greater than 21.6MPa which has the density range of 1.35 to 1.55g/cm³ was get. This system has small initial consistency, short thickening transition time, low water loss and good rheological property. And at last, the mechanism of improving the strength of low-density slag MTC cementing fluid system was analyzed.

Abstract: Using self-designed 30cm×30cm gas explosion experiment pipe and data acquisition system, we found Fe-Ni foam metal suppresses better gas explosion. We analyzed mechanism of suppressing gas explosion from material characteristics,. The three-dimensional holing-through structure of foam metal can quench exploding flame and decline exploding shock wave. Foam metal material has dual advantages of material and structure which can suppress transmission of fire and shock wave. Effect on different parameters of Fe-Ni foam metal materials was contrasted from declining overpressure and flame temperature, and suitable Fe-Ni form metal was optimized for engineering application.

Abstract: Prestress is a key parameter in bolting, while the cohesive force of layers in the compound roof strata is low and prone to separation, causing the prestress proliferation very poor. With the method of numerical simulation analysis,the location of separation in compound roof to affect the performance of bolting support was researched. It is concluded the roof separation in the edge of anchorage zone, the prestress field superpose, but is away from the deep surrounding rock and shows poor stability,however the role of cable can make up for the defect of rockbolts support. It has been found the highly prestressed strength bolting system adapts to the compound roof.

Abstract: The glass-ceramic materials were produced from silicon slag with the addition of talcum powder and TiO₂ by melting them in an electrically heated furnace and subsequent heat treatment at various temperatures and time. The microstructure and crystallization behaviors of glass–ceramics have been investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). With the increase of silicon slag content, the sequent precipitate phase is: krinovite Na (Mg_1.9Fe_0.1)Cr (SiO)₃O, pseudobrookite Fe₂TiO₅ and anorthite Ca (Al₂Si₂O₈), enstatite ferroan MgFeSi₂O₆, and albite Na (AlSi₃O₈). The shape of crystals was spherical grains. The glass–ceramic sample obtained from 70% silicon slag had the excellent mechanical performance including flexural strength of 200.45 MPa and Vickers micro hardness of 909.72 MPa.

Abstract: The paper carried out the buckling optimization on composite beam with hat stiffener by taking ply angle as optimal variables and the critical buckling load (CBL) as the optimal objective. Firstly, the paper established the mathematical optimization model, and then carried out sensitivity analysis of ply angle through Optimal Latin Hypercube Design, finally optimized the design of the layer using Genetic Algorithm. The results show that the CBL of stiffened beam with the optimized ply angle is increased by 64% than that with initial ply angle; CBL can be increased by changing the ply angle, the sheet should adopt the 0° or 90° layer, while the surface and center of stiffener should adopt ±45° layer and the rest should be 0° or 90°.

Abstract: In the article an automation system for analysis of stress-strain state of beam structures is considered. Unlike the finite element method, determining matrices are calculated using the sweep method in the Godunov’s form. Numerical solutions in this case can be gotten with almost any accuracy within accepted hypotheses of mathematical model for object calculation. It is assumed that beam elements can have variable along their axes physical and mechanical characteristics. External loads can also vary along the axes of beams. The paper contains examples that demonstrate the extremely high accuracy of the developed algorithms.

Abstract: Approach slab is mainly used to slowdown or reduce uneven settlement of bridge heads as far as possible. Setting approach slab at back of bridges and culverts is an effective and necessary way to avoid faulting slab ends between abutment and road in high-grade highway. It has come into general application and achieved good results. But nowadays, approach slab is designed based on previous experience or being set a size parameter directly instead of being made a special design. Theory and experience that the design based on is unreasonable. Author confirm the need for setting approach slab and give the reference value about length of approach slab for different grade highway according to analysis and study on the forced state of the moving vehicles at highway-bridge junction with or without approach slab.

Abstract: Sustainability assessment of intelligent buildings involves multiple indicators and parameters, multi-criteria decision-making and multiple variables model. In order to solve the problem: firstly, identify the key performance indicators of the sustainability related to intelligent buildings (environmental, social, economic and technological factors);optimize the selected indicators with both experts knowledge and measurable data; secondly, develop a new model for measuring the level of sustainability for intelligent buildings. The data acquisition of objective indicators for intelligent buildings is based upon the wireless wearable sensors networks, and the subjective indicators connected with expert experience derived through questionnaire surveys. Using a consensus-based model, which is analyzed by the analytical hierarchical process (AHP) for multi-criteria decision-making. Using the multi-attribute model based on structure entropy weight methodology and fuzzy comprehensive evaluation for priority and weight setting in the sustainability assessment is studied. It is concluded that the whole system not only acquires multiple data but also gets available and reliable assessment for the sustainability of intelligent buildings.

Abstract: experimental research is carried out in this article under typical environmental conditions, by simulating the actual environmental conditions, the migration process and its characteristics in sedimentary distribution of erosion medium such as chloride ion and sulfate ion of self compacting concrete is discussed, ion transfer characteristic and migration model of ionic medium in concrete is established.