Experimental Study On Haydite Concrete Of High Performance For Structural Thermal Insulation

According to the scientific development target in2020and65%standard ofbuilding energy efficiency, high strength and performance insulation haydite concrete isone of implementation. Although haydite concrete has lower strength, its light mass,heat preservation and crack resistance capacity is better than ordinary concrete.Strengthening the research and application of haydite concrete is the buildingdevelopment goals at present. As a result, firstly, the optimal mix proportion of hayditeconcrete which is made of expanded shale is finished to obtain the compressive strength,tensile strength, thermal conductivity, water absorption, dry bulk density and other basicparameters. Secondly, the stress-strain constitutive relationship under uniaxial stress arestudied. At last, combing with cement-based glass beads of external wall insulationsystems, the site stimulation test and calculation are completed to obtain the integrationof building insulation system, whose energy saving rate is not less than65%.Specifically, the following aspects are researched in the article:(1) According to the requirements of the strength and loose volume method, theamount of ceramic, cement types and content, water consumption, sand rate and otherparameters were determined, and then the optimum mixture radio was got throughorthogonal experimental design.(2) Based on (1), the physical and mechanical performance test of haydite concretewere made to get physical mechanics parameters and the stress-strain curves underuniaxial stress. The influence to the performances of haydite concrete with differentfiber content, such as river sand, steel fiber and chemical fiber, were studied.(3) The thermal calculations and cost analysis were made separately to the severalcombinations of ordinary concrete and bearing haydite concrete, styrofoam board ofexternal thermal insulation for external wall and cement-based glazed hollow beadinsulation system, basing on a practical project of Jiaozuo city. The results indicate thatthe best combination can reduce the energy saving rate, labor intensity, transportationweight, project cost by80%,20%,30%－40%and10%separately.