Experimental Research on Mechanical Properties and Durability of Recycled Concrete
In order to study the evolution law of mechanical properties and durability of recycled concrete,the tensile and compressive properties of recycled concrete and fiber-modified recycled concrete under different cement types,curing time and wetting-drying cycles were studied by unconfined compressive strength test and Brazil splitting test.The results show that the incorporation of basalt fiber into recycled concrete forms a three-dimensional network structure,which limits the development of micro-cracks in recycled concrete,and the unconfined compressive strength is significantly improved.The effect of improving the tensile strength of recycled concrete by improving the strength grade of cement is not significant,and the tensile strength can be improved by adding fiber into concrete.The addition of 0.5% basalt fiber can significantly reduce the mass loss rate,strength reduction and structural deterioration of the sample under the action of wetting-drying cycle,and enhance the resistance to wetting-drying cycle by more than 40% .The tensile strength of fiber-modified recycled concrete increases linearly with the increase of compressive strength,but the tensile strength is only about 9.2% of the compressive strength.
万方数据
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