Effect of different pore-forming agents on the performance of lightweight external wall brick

摘要

In this paper, the lightweight external wall brick was prepared by means of dry pressure molding sintering process to explore the effect of the pore-forming agent on its performance. The shale and clay were used as the main raw materials and additives of bran, coal powder and SiC were chosen as pore-forming agent. The results show that, for both different pore-forming agents, as the content of pore-forming increases, the water absorption got elevated and the bulk density and flexural strength got reduced. Moreover, SiC could react with oxygen to generate CO and CO_2, resulting in the appearance of numerous closed pores inside the green body after fired. It was easy to obtain low density lightweight external wall brick which could exhibit better performance.