Here is a Research of the pozzolanic activity by using the shaft-kiln calcined coal gangue and its result indicates that coal gangue can be used in great amount as addition of cement.

• 研究了利用石灰竖窑煅烧煤矸石的火山灰活性。结果表明,煅烧煤矸石可作为水泥的混合材而大量利用。