| Sprayed UHTCC not only inherits the strain hardening and multi joint cracking characteristics of ordinary pouring UHTCC,but also greatly improves the construction efficiency and economic benefits.In recent years,low-carbon,energy-saving green building has gradually become the main trend of building development.This paper innovatively developed a thermal insulation integrated composite board,which combined the excellent crack control ability of sprayed UHTCC and the excellent thermal insulation performance of organic thermal insulation material layer extruded board.The following work was mainly carried out:(1)based on the preliminary deployment results of the research group,the basic mechanical properties of sprayed UHTCC were systematically tested,and the compressive strength of sprayed UHTCC at 28 days was tested which can reach more than 40MPa,the direct tensile strength and four point bending strength are more than 3MPa and 13MPa respectively,and the elastic modulus is 17.27GPa;(2)The results show that the tensile bond strength of extruded panel with smooth surface,rough surface and coated with adhesive can reach 0.05 MPa,0.2 MPa and 0.3 MPa respectively;(3)the overall bending capacity,crack development process and failure mode of the composite plate were investigated by uniform load test,and the ultimate bending capacity was more than 3kN/m2,which met the requirements of the specification;(4)the thermal conductivity of sprayed UHTCC was 0.31 8 W/(m·K)measured by the protective hot plate method The coeffcient of thermal expansion measured by strain gauge method is 8.21×10-6/℃,which provides important parameters for the design of related thermal performance;(5)the temperature field distribution and temperature effect of the new composite panel external insulation system are simulated by using finite element software.The simulation results show that the thermal insulation performance is excellent and the thermal deformation coordination is good. |
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