THE RESEARCH ON MECHANICS AND BLEMISH DEGREE OF DIFERENT FIBER CONTENT LIGHTWEIGHT AGGREGATE CONCRETE AFTER FREEZE-THAW CYCLE
By adopting slow freeze-thaw method and carrying out freeze-thaw cycle times of 25,50,75,100,125,150,200,225,250,275 and 300 on the LC35 fiber lightweight aggregate concrete,The compressive strength and elastic modulus of the lightweight aggregate concrete after freeze-thaw cycle have been obtained by employing a press machine and an instrument for measuring dynamic modula.According to the testing-result,the relationship between the compressive strength and the number of freeze-thaw cycle as well as the relation between the blemish degree and the blemish increment after freeze-thaw cycle are attained.The volume fraction and species of fibers have great influence on the properties of lightweight aggregate concrete.According to frost resistance properties,the improving order is:hybrid fibers polypropylene fiber steel fiber.The result can provide an experiment and theoretical basis to the research of lightweight aggregate concrete in cold north-west region.