Experimental Study On The Mechanical And Durability Properties Of Fiber Reinforced Concrete After High Temperature

With the increasing intensity of urban buildings, the wide using of new materialsand the widespread using of natural gas and electrical automation, it is greatlyimproves the probability of building fires. It is not only reducing the strength, but alsodecreases greatly the ability of resisting erosion. In recent years, many scholars athome and abroad did many experimental investigations about the mechanicalproperty of the fiber reinforced concrete after the high temperature. However, therewas very little study on the durability of the fiber reinforced concrete after the hightemperature, and the relationship between mechanical and durability. Therefore, itwill be very important and meaningful to research on the durability and mechanics ofthe fiber reinforced concrete after the high temperature, and also the relationshipbetween them.This dissertation will focus on the following several aspects:(1)Summarize the research status of fiber reinforced concrete after the hightemperature abroad, and also the existing problems.(2)Analyze the changing situation of the compressive strength of cube concretewhen with different temperature and different fiber content. The result shows that thecompressive strength of concrete specimen will reduce and the downtrend increasewith the rising of temperature; different fiber content has slight effect on compressivestrength of cube concrete after high temperature.(3)Analyze the changing situation of Chloride ion permeability coefficient ofconcrete when with different temperature and different fiber content. The result showsthat the Chloride ion permeability coefficient of fiber concrete specimen will increaseand the uptrend slow down with the rising of temperature; With the same hightemperature, the Chloride ion permeability coefficient of concrete will rise with therising amount of cellulose fiber.(4) Analyze the correlation between the compressive strength of cube concreteand the Chloride ion permeability coefficient when with different temperature anddifferent fiber content. The result shows that the compressive strength of concrete specimen will reduce with the rising of Chloride ion permeability coefficient, andthey two have nonlinear correlation.(5) This dissertation presents the regression curve and regression surface of thecompressive strength of cube concrete, the Chloride ion permeability coefficient andthe high temperature, which provides a basis for the analyzing of concrete structureafter fire or the experimental study on concrete after high temperature.