Study on the effect of recycled fine powder on the properties of cement mortar and concrete

With the development of the city, a large amount of waste concrete and broken bricks will be produced. The development and utilization of waste concrete will produce recycled coarse aggregate, recycled fine aggregate and recycled powder. Therefore, this paper studies the influence of these powders on the performance of cement mortar and cement concrete, and analyzes the performance of the powder instead of cement and fine aggregate. The results show that the strength of the mortar is greater than the reference strength after the powder is mixed, and the powder substitution rate is 17 %. Replacing cement with 14 % powder and replacing fine aggregate with 20 % powder, that is, the content of powder is 34 %. After replacing recycled fine aggregate with a certain proportion of recycled powder, the strength of concrete can be improved under the premise of less reduction of workability.