| In recent years, the increasingly serious energy crisis and environmental pollution problems make people realize the importance of energy conservation. The construction industry is a huge energy consumption industry, and the energy loss caused by poor heat preservation effect of building external wall occupy a large proportion of the building energy consumption. Therefore, adopt the performance of building external wall thermal insulation material to transform the wall structure, can make the building exterior wall heat loss to a minimum, and improve the thermal insulation performance of construction exterior wall. The traditional exterior wall thermal insulation material has some faults such as low strength, poor fire resistance, larger water absorption, poor durability, and so on. We referenced the application of fiber in the concrete and the other cement-based composite materials, and committed to explore the preparation of high quality material(Vitrified Beads Exterior Thermal Insulation Board), which with cement and fly ash as cement materials, vitrified beads as light aggregate, supplemented by a variety of additives, and added appropriate proportion of chopped polypropylene fiber, glass fiber, carbon fiber hybrid as a system. In the process of this topic research, the main research contents and results are as follows:(1) On the basis of previous research work, the influence of efficient foam agent, calcium chloride, M8 water reducing agent for Vitrified Beads Exterior Thermal Insulation Board were researched, and determined the dosage of efficient foam agent, calcium chloride, M8 water reducing agent were 6wt%, 1.5wt%, 0.2wt%, respectively.(2) Adopted three different kinds of fiber dispersion method to study effect of Vitrified Beads Exterior Thermal Insulation Board, ultimately determined the method C namely mechanical stirring at the same time accompanied by ultrasonic dispersion is the optimal way of fiber dispersion, and at this dispersion condition, the 3d flexural and compressive strength of sample is 0.33 MPa, 0.52 MPa respectively.(3) The polypropylene fiber were modified by chromic acid, the polypropylene fiber surface were introduced active group-OH and-COOH after modified, which significantly improved the effect of the interface combination between fiber and cement matrix. Studies have shown that, the appropriate mix content of the modified polypropylene fiber was 0.8wt%, under this condition, the sample of 3d flexural, compressive strength was 0.39 MPa, 0.52 MPa respectively, and 28 d flexural, compressive strength was 0.53 MPa, 0.69 MPa respectively.(4) Studied the reinforced effect of glass fiber, carbon fiber? and carbon fiber?for Vitrified Beads Exterior Thermal Insulation Board, the experiment determined the best addition amount of glass fiber was 0.4wt%, and the 3d flexural strength and compressive strength sample of were 0.34 MPa and 0.49 MPa, the 28 d flexural strength and compressive strength were 0.47 MPa, 0.64 MPa respectively. The optimum adding amount of carbon fiber?was 0.1wt%, the 3d flexural strength, compressive strength of sample was 0.43 MPa, 0.61 MPa, the 28 d flexural strength, compressive strength was 0.56 MPa, 0.72 MPa, respectively. The optimum adding amount of carbon fiber?was 0.06wt%, the 3d flexural strength, compressive strength of sample was 0.42 MPa, 0.59 MPa, the 28 d flexural strength, compressive strength was 0.56 MPa, 0.74 MPa, respectively.(5) Blend the different scales of carbon fiber, carbon fiber and polypropylene fiber and studied the reinforced effect of binary hybrid fibers for Vitrified Beads Exterior Thermal Insulation Board. The orthogonal experiment inquiry of carbon-carbon hybrid fibers have shown that the sample of B3 group have the optimal performance, namely the content of carbon fiber ? and carbon fiber?was 0.06wt% and 0.02wt% respectively. The orthogonal experiment inquiry of carbon- polypropylene hybrid fibers have shown that the sample of C2 group have the optimal performance, namely the content of carbon fiber and polypropylene fiber was 0.02%wt and 0.06wt% respectively.(6) Through the orthogonal experiment design, polypropylene fiber, carbon fiber, glass fiber, three different types of fiber mixed and added to the Vitrified Beads Exterior Thermal Insulation Board in the experiment research, the orthogonal experiment determined the best mixture ratio was confirmed as A2B3C3, namely polypropylene fiber content was 0.4wt%, carbon fiber content was 0.03wt%, glass fiber content was 0.3wt%.(7) Emulsion stearic acid, organic silicon waterproofing agent, emulsion composite waterproofing agent were choose to carry out the experiment research, and the studies have shown that, the waterproof effect of emulsion composite waterproofing agent is the best, the best dosage is 5wt%, and the 2h and 24 h bibulous rate of sample were 4.12%, 9.89% respectively. |
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