再生微粉的性能及应用

Properties and application of recycled fine powder

与普通骨料制备过程中产生的石粉不同,再生骨料制备过程中产生的粉体(简称再生微粉)含有大量的硬化水泥石和未完全水化的水泥,具有较高的活性,同时也有较大的内比表面积.为了实现再生微粉的有效利用,试验研究了不同掺量再生微粉对砂浆、混凝土和加气混凝土强度的影响.结果表明:砂浆中再生微粉的掺量可以控制在28%以内,其中最佳掺量为14%,再生微粉效能系数为1.06;混凝土中再生微粉掺量可达30%,但会影响混凝土的工作性,最佳掺量为24%,再生微粉效能系数为1.16;加气混凝土中掺入30%以内的再生微粉对加气混凝土的性能无显著影响,可作为部分硅质材料用于加气混凝土的生产.

Different from the stone powder,the recycled fine powder（RFP） is obtained from the process of recycled aggregate manufacturing.The RFP owns a huge of harden cement paste and unhydrated particles,so it has higher activity and internal specific surface area.For the effective utilization of RFP,the influence of RFP content on the compressive strength is tested in mortar,concrete and aerated concrete respectively.The results show that the maximum content of RFP in mortar is 28%,the optimal content is 14% while the efficiency index of RFP is 1.06;the maximum content of RFP in the concrete is 30%,the higher content may decrease the concrete workability,the highest efficiency index of RFP with 24% content is 1.16;the compressive strength of aerated concrete is less affected within 30% content of RFP,it is available as part of siliceous materials in the manufacturing process of aerated concrete.