The Experimental Study Of Fiber Reinforced Concrete Durability Based On The Freeze-thaw Damage

In this paper， the C30air-entrained hydraulic concrete， Polypropylenefibers entrained air-entrained hydraulic concrete， Cellulose fibers entrainedair-entrained hydraulic concrete based on the freeze-thaw cycle test， the test ismainly divided into no freeze-thaw test and freeze-thaw test group． Combinedwith theory and experiment carried out based on the research of freeze-thawcycling test; And we analyze the influence of the freeze from the Angle ofmacroscopic and microscopic interpretation thaw damage of concretedurability． In this paper， the main workof this article includes the followingseveral sections：(1) The study of fiber concrete research status at home and abroad aresummarized， based on freeze-thaw damage under the condition of the necessityof research on the durability． And this paper analyzes the advantages anddisadvantages of the resistivity testing technology．(2) No freeze-thaw test for different age groups to carry out concreteresistivity measuring, microscopic scanning, electron microscopy, spectroscopy,and nitrogen adsorption method based on comparison test; against freeze-thaw testgroup carried out relative dynamic elastic modulus, the rate of mass loss studiesbased on different degrees of freezing and thawing concrete resistivity．(3) Analysis of the impact on the durability of concrete mixing fiber andmicro-pore structure indicators and analyze its relevance．The test results showedthat: mixing polypropylene fibers and cellulose fibers and micro-pore structurecan have varying degrees of impact on the durability of concrete．(4) Analyzed the freeze-thaw cycle on the durability of concrete that wasmixed with fiber and the influence of microscopic pore structure，and analyzes itsrelevance．Experimental results show that：after mixing the fibers for concretemass loss rate of freeze-thaw cycle test，the relative dynamic elastic modulus，have significantly improved the performance of the resistivity． (5) Based on this test，the analysis of the results of the variation of theconcrete mixing fibers in each index not thaw and freeze-thaw cycles under theinfluence and relevance． To give some reference to further research in this fieldin the future．...