粉煤灰中的含钙矿物及其影响

含钙矿物是粉煤灰中重要的矿物成分,其含量变化会使粉煤灰性质与使用性能发生比较大的变化。总结分析了粉煤灰中含钙矿物的形成过程与存在形态,重点分析了含钙矿物对粉煤灰性能及其应用的影响。结果显示粉煤灰中SO3与CaO含量存在一定线性关系,含钙矿物增加会引起粉煤灰颗粒形貌、硅酸盐离子聚合度等发生变化,提高粉煤灰火山灰活性,但也会引起粉煤灰使用过程中体积稳定性不良,对粉煤灰在水泥混凝土中应用产生不利影响,若合理利用将会使得含钙矿物成为粉煤灰利用的有利因素。

The Formation and Effect of Calcic Minerals in Fly Ash

The content of calcic minerals in fly ash is an important factor affecting the properties and application of fly ash.We reviewed information about and analyzed the formation of calcic minerals in fly ash and the negative effects of calcic minerals on fly ash properties.We found that the content of SO3 versus CaO is a linear relationship.Fly ash morphology and degree of silicate polymerization vary as the calcic minerals content in fly ash increases.Higher levels of calcic minerals in fly ash may cause poor soundness of cement and concrete added with fly ash;high content calcic minerals in fly ash may become an advantage,however,when the volume of fly ash used in concrete is limited and the fly ash is pre-treated.