|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Streams: Recycling and Sustainability Joint Session
||Utilization CFA-derived Tobermorite Fiber as Crystallization Revulsive in Autoclaved Concrete Block Production
||Pengxu Cao, Jun Luo, Guanghui Li, Yijia Dong, Mingjun Rao, Zhiwei Peng
|On-Site Speaker (Planned)
Coal fly ash (CFA), as a by-product generated from coal fired power stations, is widely used for autoclaved concrete block production. It has been found that the generation of tobermorite is great benefit to the block strength during autoclaving. In this study, the tobermorite fibers synthesized from CFA and lime via the hydrothermal process are used as the revulsive to promote the mechanic strength of the concrete blocks. The results show that tobermorite fibers with 0.01-0.5 μm in diameter and 1-3 μm in length are obtained at 200 oC for 0.2 h. With the addition of prepared tobermorite fibers increases from 0 wt.% to 2.0 wt.%, the compression strength of concrete block increases from 24.6 MPa to 40.5 MPa, and the compression strength of aerated concrete block produced under the optimized conditions can reach above 7.5 MPa.