固废煤矸石的活化及其对混凝土力学性能的影响

Activation of gangue and its impact on the mechanical properties of concrete

研究表明热力活化和机械活化方法能够有效的提高煤矸石的活性。煤矸石的最佳活化煅烧温度为900℃,煅烧后的煤矸石具有良好的易磨性,粉磨至比表面积550 m2/kg左右为宜。高温煅烧使煤矸石结构膨胀及部分成分挥发,出现较为明显的颗粒状结构并伴有一定的孔洞结构。煤矸石掺合料的需水量较粉煤灰和矿粉高,煅烧煤矸石粉对混凝土有早期的增强作用,且具有后期的强度增长保持能力;其活性介于粉煤灰和矿渣之间,比较接近矿渣。

Research showed that thermal activation and mechanical activation method could effectively improve the activity of coal gangue.900 ℃ is the optimum temperature of high-temperature activation of gangue, it had easy powder grinding characteristics after calcining and grinding to the specific surface area of 550 mVkg was the best.The gangue structure expansion and some of the ingredients volatile and appear obvious granular structure and associated with certain hole structure after high-temperature calcination.Coal gangue admixture of water demand more than fly ash and mineral powder, calcined coal gangue powder to promote the early strength of concrete increased, and had the strength remains ability in the late.The active between fly ash and slag between, closer to the activity of slag.