Influence of active or inert mineral admixtures on the hydration characteristics of complex binder
Influence of active or inert mineral admixtures on the hydration characteristics of complex binder
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发表时间：
2007
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通讯作者：
Zhang Qing-huan
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作者：
Zhang Qing-huan
采用等温量热法、x射线衍射法和非蒸发水分法研究了含活性矿物和惰性矿物外加剂的复合粘结剂在不同温度下固化的水化过程。研究了水化产物含量和水化程度随龄期的变化。在掺合料掺量均匀的情况下，矿物掺合料类型对复合粘结剂初始水化过程的影响不明显。水化过程受存在于复合粘结剂中的硅酸盐水泥控制。活性粉煤灰能延缓复合粘结剂的水化，而惰性石英粉则不能。热刺激能显著增强粉煤灰的火山灰反应，但抑制硅酸盐水泥的长龄期水化。热固化使水化初期形成的高含水量CSH凝胶转变为低含水量CSH凝胶。在粉煤灰的火山灰反应中形成低含水量的CSH凝胶。
The hydration process of complex binders containing active or inert mineral admixtures cured at different temperature schedules was studied using isothermal calorimetry,XRD and non-evaporated water content.The age-depended hydration product content and hydration degree were investigated.There is not obvious influence of type of mineral admixtures on the initial hydration process of complex binders when the adding content of admixture is uniform.The hydration process is controlled by Portland cement existing in complex binder.Active fly ash can delay the hydration of complex binder,but inert quartz powder does not.The heat stimulation can greatly enhance the pozzolanic reaction of fly ash,but suppress the long-age hydration of Portland cement.Heat curing makes the high water content of CSH gel formed in the initial hydration period transform to the low water content of CSH gel.CSH gel with low water content forms in the pozzolanic reaction of fly ash.