Study on The Method and Performance of Ceramsite Manufactured from Zipingpu Reservoir Sediment

Abstract

Zipingpu Reservoir sediment is used as raw material to prepare ceramsite. Through the analysis of the ceramsite composition and mineral composition, the feasibility of making silt ceramsite was discussed. The influence of sintering temperature and admixtures on the structure and properties of the prepared ceramsite was discussed from technical indicators such as the surface glass phase, pore size, internal structure and porosity of the ceramsite, and the optimal manufacturing process parameters of the ceramsite were determined. The results show that the composition of Zipingpu Reservoir’s silt meets the requirements of the chemical composition of ceramsite and has marvelous conditions for preparing expanded ceramsite. With the increase of sintering temperature, the skeleton structure of ceramsite is gradually dense, meanwhile, the surface pores and the internal closed pore diameter increases.When the sintering temperature is 1175°C and the holding time is 20 minutes, the silt ceramsite structure with 100% silt ratio is the densest. Its closed pores are dense and uniform, and there are fewer interconnected pores. The best quality ratio of silt and basalt powder to prepare silt ceramsite is 93:7. The effect on the performance of silt ceramsite is sintering temperature, pore-forming agent, and holding time in descending order.