Advanced Materials Research Vols. 834-836

Abstract: Overexploitation has led to the destruction of resources and endangered ecological environments. Therefore, research for renewable material has become more important in the construction industry. This study used sintered lightweight aggregate made of clay to replace the coarse and fine aggregate and processed aluminum-wastage to make the foaming agents for cement, producing a brand-new extra-lightweight expanded no-fines cellular concrete. The cellular concrete not only utilizes recycled materials, but also produces an environment-friendly, green building material. Validated throughout the experiment, the cellular concrete may provide functions such as fire protection, thermal resistance, and acoustic absorption when used as non-structural material. This paper attempts to evaluate the basic physical properties of cellular concrete by different water/cement ratio (W/C) and agent/cement (A/C) ratio for the coefficients of expansion, compression strengths, and the thermal conductivity.

Abstract: Six reinforced concrete beams, including 4 beams strengthened with BFRP sheets at different layer of BFRP sheets and 2 control beams, are tested to investigate the effect of layer of BFRP sheets on the ultimate flexural resistance and load-deflection response of the pre-damaged concrete beams strengthened with BFRP sheets. Results show that the flexural resistance of pre-damaged concrete beams increases along with the BFRP sheets layer increasing,but the flexural resistance enhances the degree not to assume the linear relations to the enforcement layer.Numerical simulation of the pre-damaged concrete beams strengthened with BFRP sheets is conducted by ANSYS, and the results of numerical simulation are compared with those of the test results. It turns out that the results of numerical simulation are in good agreement with the test results.

Abstract: This paper studies on the influence of impermeability in basalt fiber of C50 concrete, and the result was compared with the same dosage of polypropylene fiber. Experimental test show that after incorporating basalt fiber and polypropylene fiber concrete impermeability resistance were significantly improved, the impermeability of polypropylene fiber is superior to basalt fiber.

Abstract: With the characteristics of wide range of sources of raw materials, environmental protection and cost-effective, Basalt Fiber, which is used as a kind of reinforced material of concrete, has received the attention of civil engineering. This paper summarizes the research status of Basalt Fiber Reinforced Concrete in China and abroad, and put forward proposals for the research of Basalt Fiber Reinforced Concrete.

Abstract: Abstract: During material performance test, it can be seen that the results of 3min water-boiling adhesion experiments of limestone and basalt, in accordance with testing regulations [1], are both fifth grade, without any difference. Through the analysis of microstructure and chemical composition of limestone and basalt, it is found that huge difference exists between limestone and basalt, hence it can be conjectured that their adhesion should be different from that of asphalt. In order to further validate the difference degree of this feature of limestone and basalt, the paper, based on testing regulations, prolongs boiling time in experiment and conducts freezing-thawing cycle for the acceleration of exfoliation of asphalt membrane, aiming to conclude the result that the adhesion between limestone and asphalt is better than that between basalt and asphalt. In this way, solid basis is provided for limestone to replace basalt on the construction of SMA road surface.

Abstract: In order to improve aderverse state of connection between cement concrete pavement and base layer, the black substratum of asphalt concrete was set between pavement and base layer. According to the elastic mechanics theory, 3d finite element model of pavement structure was established, the vertical displacement of each structure layer was analyzed by using ANSYS. The results show that black substratum can absorb part of deformation energy by using its good deformation ability, so as to improve the stress condition of the entire pavement structure. It can increase the ability of structure layer deformation coordination to set the black substratum, which can make rigid pavement combine the characteristics of rigid pavement and flexible pavement.

Abstract: This study was aimed to evaluate the protection effectiveness of various concrete surface treating materials. Four types of surface treating materials and six parameters were selected. Compressive strength test, absorption test and permeability test were performed. Taguchi method was adopted to identify the key factors influencing the protection effectiveness provided by the surface treatment. L₁₆ (8¹Î2⁶) orthogonal array was chosen to reduce the number of experiments. The major sequentially influential factors are type of coating material, w/c ratio of concrete substrate and coating thickness.

Abstract: The experiment discussed influences of basalt fiber with different adulterate amount to the compressive and fracture resistance properties of waterproof concrete C50. We also made comparison between experimental results and mechanical property of polypropylene fiber waterproof concrete. The experimental results demonstrated that the brittle failure character of waterproof concrete has been improved to some extent, and the compressive and fracture resistance strength of the test specimen has increased apparently after adulterating basalt fiber and polypropylene fiber. Furthermore, it is mainly unanimous of the influence regular patterns of basalt fiber and polypropylene fiber to waterproof concrete when adulterating the same amount.

Abstract: The experiment study on flexural behavior was carried out on six damaged RC beams strengthened by BFRP and two common beams by the way of three point loading method. The failure characteristics, flexural capacity, deflection, strain distribution and the influence of the different layers of BFRP was observed and analyzed. Results show that the bearing capacity of the damaged RC beams strengthened with BFRP is enhanced with the layers increasing, and the relationship is not linear; the bearing capacity of the specimen increased by 79.98% when five layers are pasted; with the increase of paste layers of BFRP, the peel failure mode is more likely to occur.

Abstract: The tests of 5 basalt fiber reinforced high-strength concrete filled steel tubular short columns and 1 high-strength concrete filled steel tubular short column were carried out under axial compression load, and the influence of different dosages and length-diameter ratio of basalt fiber on the mechanical behavior of the basalt fiber reinforced high-strength concrete filled steel tubular short columns were discussed. The results indicated that the ultimate load-bearing capacity and the ductility of short columns were improved by adding basalt fiber in concrete, and the failure mode of short columns was not affected by adding BF in concrete.