Study of properties on fly ash-slag complex cement

In China, blast furnace slag (BFS) has been widely used as an additive to cement and concrete. So it is almost completely utilized. Therefore, the cost of BFS is higher, so the cement expense is going to increase. Therefore, it is necessary to partially replace BFS with fly ash, which has lower cost and therefore has not been used in large quantity. This paper studies the mechanical properties, hydration degree, pore distribution and hydrates of fly ash-slag complex cement (FSCC) by strength and other physical mechanical tests, XRD, TGA and pore structure analysis. Test results show that there were better properties when fly ash was added in a proper ratio. It is called an effect of mutual complement of superiority supplement. In addition to this, the admixtures speed up the hydration of complex cement and improve the strength and pore structure properties. (C) 2000 Elsevier Science Ltd. All rights reserved.