Experimental study on the mechanical properties of polypropylene fiber concrete affected by cellulose after high temperature
In order to study the effect of cellulose on the mechan-ical properties of polypropylene fiber concrete after high tempera-ture,a total of 90 cube test blocks and 90 prism test blocks were designed and subjected to high temperature tests at 200～800℃to analyze the mass loss and mechanical properties of the test blocks after high temperature.The results show that:①when the temperature is below 400℃,the mass loss of concrete is slower,when the temperature is above 600℃,the mass loss rate of the specimen rapidly increases,and when cellulose is added,the mass loss rate of the specimen decreases;②the compressive strength decreases with the increase of temperature,and with the increase of fiber content,the compressive strength of the speci-men increases,at room temperature,the compressive strength of fiber concrete with 1%fiber content is better,when the tempera-ture is above 400℃,the compressive strength of concrete with fiber content will significantly decrease;③the flexural strength increases with the increase of fiber content,but the addition of cellulose will reduce the flexural strength of polypropylene fiber reinforced concrete after high temperature.
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