Experimental Study On Mechanical Properties And Durability Of Rubber Powder Concrete Under Dry-Wet Cycling Environment And Natural Environmental Exposure

Bubber concrete is a kind of environmental protection modified recombination concrete material that is based on concrete and mixed with rubber powder.Rubber powder is the main way to recycle crumble rubber,therefore,rubber concrete has significance to environmental protection.It works out the contradictory issues between high strength and high brittleness of the concrete to mix rubber in concrete.Meanwhile,rubber concrete has the advantage of being light,damping,noise reduction and pervious to air and water.As a result,people are paying more and more attention to rubber concrete.However,there is not any report about the study on durability especially on durability under hot and humid environment in subtropical area.Mechanical properties,fracture performance and durability of rubber powder concrete under dry-wet cycling environment is studied in this paper.Based on different rubber replacement(0,10%,20%,30%),different times of the dry-wet cycling(0,90,180,270 and 360 times)and different time of natural environmental exposure(6 and 12 months).It can be concluded from this study that axial compressive strength of rubber powder concrete decreased when the rate of replacement increased.However,the relationship between ultimate strain of rubber powder concrete with times of the dry-wet cycling was not obvious.The relationship between ultimate strain of rubber powder concrete with the rate of replacement was obvious and ultimate strain of rubber powder concrete decreased when the rate of replacement increased.Fracture energy and fracture toughness of rubber concrete decreased when the rate of replacement increased.