Study on the effect of water-based drilling rock chip fine aggregate substitution rate on the performance of pavement cement concrete
In order to solve the problem of resource utilization of water-based drilling rock chips generated in the process of shale gas extraction,the performance of water-based drilling rock chips in cement concrete was investigated.The mechanical properties and frost resistance of cement concrete with different water-based drilling rock chips fine aggregate substitution rates and different water-cement ratios were investigated.The study shows that in different cement concrete with different water-cement ratios with water-based drilling rock chips replacing part of the cement concrete fine aggregate,the mechanical properties decrease with the increase of the substitution rate but show different decreasing trends.Among them,the compressive strength recovers at 15%substitution rate,the bending strength recovers at 5%-15%substitution rate,and the splitting tensile strength shows a decreasing trend.The frost resistance of cement concrete accelerates the deterioration with the increase of water-based drilling chip substitution rate,and the subsritution rate of water-based drilling rock chips should be controlled within 15%.Taken together,water-based drilling chips with a subsritution rate of 5%-15%can be considered for application in cement concrete.
water-based drilling rock chip concretesubstitution ratewater-cement ratiomechanical propertyfrost resistance
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