| Abstrakt: |
In order to seek an effective way for the high-value resource utilization of engineering slurry, ceramsite was prepared by adding different proportions of fly ash and steel slag with mechanically dehydrated slurry cake as the main raw material, and the molding equipment and process flow for preparing ceramsite with high water content slurry cake were designed. The influence of chemical composition on the properties of ceramsite was investigated. The workability and strength properties of ceramsite concrete were tested and compared with ordinary concrete. The results show that adding the appropriate amount of steel slag can effectively improve the strength of ceramsite and reduce the water absorption, however fly ash is opposite. The main reason is that the adding of steel slag optimizes the SA/R (mass ratio of refractory component to fluxing component) of clay, while the adding of fly ash deteriorates SA/R. When the content of steel slag is 10% (mass fraction), the compressive strength of the sintered ceramsites is 5. 8 MPa, the water absorption rate is 10.4%, the bulk density is 1076 kg⋅m-3, and the apparent density is 2 010 kg⋅m-3, which meets the requirements of the Technical specification for ceramsite concrete (DBJ/ T 15-62-2021) for the use of high-strength ceramsite and can be applied to ceramsite concrete. The compressive strength of ceramsite concrete designed according to C45 is 23.49 MPa. The fluidity of ceramsite concrete is good, the apparent density is low, and the self-weight can be reduced by 12.4%, which is suitable for non-load-bearing structures. [ABSTRACT FROM AUTHOR] |
