Experimental Study On Polypropylene Fibers And Air-entraining Concrete Mechanical Properties And Freeze-thaw Resistance Performance

Freeze-thaw damage of buildings is extremely broad, including the structure of the hydraulic structures, roads and bridges and railway bridges subjected to enormous freeze-thaw damage. Therefore, the durability of concrete become a very prominent the Eph be to solve the problem in today’s construction projects.In this paper cited the gas freeze-thaw resistance of concrete to study the polypropylene fiber durability-based, were prepared the C30of C50two kinds of strength grade concrete. On this basis, the C30and C50standard concrete, consider the mechanical properties of polypropylene fiber content and air-entraining agent dosage and frost resistance, and analysis of relevant factors, polypropylene fibers and air-entraining agent frost resistance of concrete on concrete frost resistance and the two together. The main tasks:preparation of the C30, C50concrete mixed with polypropylene fibers, water reducer, air entraining agent. Study admixture content on the C30, C50mechanical properties of concrete, different admixtures in different grades with different contents of concrete at early age compressive strength of performance, as well as provide the basis for antifreeze properties of anti-the compressive strength of cube compressive strength mainly to the different curing period to conduct investigations. Kang freeze-thaw cycle performance, primarily through the different fibers and air-entraining agent content, the concrete specimens under different number of freeze-thaw cycle of mass loss rate and the relative dynamic elastic modulus and after freezing and thawing of the compressive strength as the main measure of, and then discuss the polypropylene and air entraining agent for concrete frost resistance.