The Research Of Concrete Of Polyester Fiber And Broken Glass For High Temperature Resistant

Fire damage to the buildings and the cracking of concrete and corrosion of sulphate have been at home and abroad. With the rapid development of national economy in the21st century, the vigorous development of the construction industry, large-scale high-rise buildings are constantly emerging in our country. The requirement of the crack resistance of concrete for the dam body of dam becomes higher. In view of this, it put forward higher request for the crack resistance and corrosion resistance of high temperature materials. It is of great significance to meet current dam against crack and buildings against crack and corrosion resistant material requirements.This thesis set the durability of polyester fiber reinforced concrete as the main research object. It studied the influence of the basic mechanics performance of polyester fiber reinforced concrete with different dosage of fly ash, slag glass, the influence of mechanics effect of polyester fiber reinforced concrete with different dosage of polyester fiber, and explored its function mechanism. Through contrast test, it studied shrinkage performance, high temperature resistant performance and resistance to sulphate corrosion performance of the Polyester fiber reinforced concrete and the reference concrete.Research result:(1) By orthogonal experiment, it obtained the optimal mixing proportion of concrete, polyester fiber concrete mixture ratio:0.30W/C,20%fly ash,20%glass, polyester fiber2kg/m3, and sand rate was38%.(2) Compared with the reference concrete, the compressive strength and splitting tensile strength of the optimal set of concrete increased by10%and7%, respectively.(3) By contact method of shrinkage test to concrete, the shrinkage value of concrete mixed with glass, fly ash and polyester fiber compared with that of the reference concrete, the shrinkage value of optimal group were less than the same period of reference group and no fiber group,3d,7d and28d reduced by26.8%,25.5%,26.7%compared to the benchmark group respectively, by19.0%,20.8%and18.5%compared with no fiber group respectively.(4) Uses the high temperature furnace to test the resistance to high temperature of concrete. After high temperature, to the concrete mixed with fly ash, glass and polyester fiber, the higher the temperature, the lower the compressive strength. Under the condition of natural cooling, after300℃high temperature compressive strength decreased by5.0%and14.0%. The compressive strength of concrete of one of the most optimal group is higher than the room temperature, relative residual compressive strength is0.9%; when the temperature is600℃, the compressive strength of the optimal set of concrete is higher than the room temperature,and relative residual compressive strength is5.2%; after900℃, the compressive strength of the optimal set of concrete is higher than the room temperature, and the relative residual compressive strength is only0.1%. Under300℃, the absolute residual compressive strength of the optimal set of concrete increases by0.9%compared with the reference concrete. (5) According to the results the resistance to sulfate corrosion of the polyester fiber concrete, the resistance to sulfate corrosion of Polyester fiber concrete is lower than the reference group.