温度和碱对低钙粉煤灰的活化和结构的影响

INFLUENCE OF TEMPERATURE AND ALKALINITY ON ACTIVATION AND MICROSTRUCTURE OF FLY ASH

用TGA、测孔和SEM测试方法研究了粉煤灰在不同温度和不同碱度环境下的活化机制、水化产物和微观结构 .研究表明 :粉煤灰-石灰系统在常温下养护 ,粉煤灰的反应能力较低 ,这是因为在Ca(OH) 2 存在条件下的活化很慢 ,只有提高养护温度或在碱和硫酸盐存在条件下才有利于结构的解体和水化产物的稳定 .

Active mechanism, hydrates and microstructure of fly ash were studied by TGA and pore structure and SEM analysis. Results show that the reaction degree of fly ash is very low in the fly ash-lime system at room temperature, indicating that Ca(OH) 2 has low activation capability on fly ash under the condition. It is found that enhancing curing temperature, increasing alkalinity and introducing sulfate are effective to break the structure of fly ash and to stabilize the hydrates.