Advanced Materials Research Vols. 450-451

Abstract: This study is intended to present a computational thermal model for a residential building. As the Performance Based Design is more popular, fire-intensity and fire-load have turned out to be very important factors for building design and can be predicted through some computational work. To predict and estimate the fire properties of a residential fire, we made some numerical models of combustibles and residential building. In a bid to validate the estimate values, computational analysis results from numerical models were compared with real fire tests. For computational analysis, the Fire Dynamics Simulator was used with Large Eddy Simulation model for turbulence. Consequently, fire-intensity was well predicted and flash-over of rooms were successfully estimated.

Abstract: Jacquard stitch is widely used in clothing and many other areas in recent years. The paper describes the structural features, classification and knitting crafts of the jacquard stitch. Particularly are the knitting process and the locus of needles on the needle bar. However, newly design by the fancy appearance formation regularity is the emphasis of this paper. The design principle is according to the arrangement of color yarns and the drafting of new stitches. Cotton and polyester blended yarns are taken as the raw materials with several colors. Finally, a style of the double-faced jacquard stitch of the complementary yarns and a style of the sesame points are finished on the double-needle bar by the flat knitting machine.

Abstract: Significant improvement of damping characteristics can be achieved by using the new class of magnetic constrained layer damping treatment (MCLD). This paper presents the damping properties of the first and second torsional mode for a five-layer cantilever rectangular plate treated with partial MCLD. The Rayleigh-Ritz method and Hamilton’s principle are employed in the analysis. We have chosen both single and segmented patches with different sizes. It can be observed that for the two modes single-patched MCLD treatment induces less improvement of damping characteristics especially for the short patch. The effects of calculation of parameters like placement strategies of discrete patches, the length of patches are analyzed and discussed. The results obtained from analytical show that the optimum location of the patch, for the torsional mode, is at edge of the plate. Favorable comparisons with the conventional passive constrained layer damping treatment (PCLD) on various special cases of the problem are obtained. The results demonstrate MCLD treatment still improvements over PCLD in damping structural vibrations.

Abstract: Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four-point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0h, 16h, 24h and 72h in condition of (20±2)°C and (60±5)% relative humidity was tested at a loading rate of 0.05 mm/min. For specimens after drying for 24h and 72h, flexural toughness was tested at loading rates of 0.05 mm/min, 0.10 mm/min, and 0.20 mm/min respectively. With the moisture content decreasing, the flexural toughness T100,2.0, first-peak flexural strength, and residual flexural strength at prescribed deflections of FRSC exhibited decreasing tendency. The specimens with 0.5 vol% of steel fiber showed higher T100,2.0 value than that with 0.9 vol% of macro synthetic fiber. The residual strength and flexural toughness of FRSC increased with the increase of loading rate.

Abstract: Leakage is a difficult problem influenced the quality of engineering. According to the latest research, improper construction accounted for 45%, short-lived materials accounted for 22%, poor design accounted for 18%, and management disadvantage accounted for 15%. So, not familiar with the technical regulations and imperfect of the quality inspection method are main reasons to cause leakage. GT is as an example, to analysis the method of construction technology and quality inspection in engineering. Introduction

Abstract: The effects of moisture content on the bending strength of T300/914 composite laminates that immersed in water for 7 days and 14 days was discussed in this paper. The three-point bending tests were conducted on the composite laminates. Experimental results reveal that the moisture content in the laminates increased with immersion time and that moisture absorption accelerated damage propagation in the composite laminates. The bending strength of the unaged, aged specimens were characterized and analyzed. Compared to the unaged specimens, the bending strength of the composite laminates immersed for 7 and 14 days decreased by 6.62% and 16.98%, respectively. The results revealed that the bending strength of the aged specimens decreased with the increasing immersion time.

Abstract: An iron mine in Fujian that is mining a hydrologically complicated deposit with karst water, faces the problems of high water pressure and unclear inflow. Therefore, it’s imperative to predict mine discharge exactly. The 3D finite element simulation model is established basing exploration data and theoretical analysis results, which gives exact generalization of special hydrogeology elements such as fault zone, karst springs, surface water leakage and chamber for dewatering. At last, the effect of dewatering scheme are evaluated for +300m.

Abstract: A loading comparison experimental study on concrete circular columns confined by hybrid fiber sheets of carbon FRP sheet, basalt FRP sheet, and glass FRP sheet is carried out to analyze their failure feature, bearing capacity, ductility and economy. Test results show that HFRP can increase the ductility of column and deduce the price on the precondition of having enough bearing capacity.

Abstract: Different amounts of shell and calcium carbonate were added into the Portland cement, their influences on the compressive strength, sulfate corrosion resistance, hydration heat and porosity of the hardened cement paste were studied. Results show that with the increasing of shell content, the compressive strength decreases, however, modest reduction; as the increase of calcium carbonate content, the strength first increases and then decreases, the compressive strength reaches the highest value when the content is 15%. After addition of shell and calcium carbonate, the initial hydration reaction rate accelerates, meanwhile the induction period and acceleration period are brought forward. With the raising of shell and calcium carbonate content, the corrosion resistance coefficient increases gradually, and the sulfate corrosion resistance increases as well. The proportion of the harmless hole which diameter is smaller than 50nm increases after adding the shell and calcium carbonate, it’s beneficial to improve the performance of concrete.

Abstract: As a new building materials, mechanical properties﹑physical properties and chemical properties of basalt fibers are studied in the paper. Compared with other building materials, the basalt fibers have better tensile strength than the E-glass fibers, greater failure strain than the carbon fibers as well as good resistance to chemical environment, impact load and fire with less poisonous fumes. In addition, the basalt fibers do not contain any other additives in a single producing process, which makes additional advantage in cost. In addition, the applications of basalt fibers in building materials are emphatically elaborated.