活性或惰性掺和料对复合胶凝材料水化性能的影响

采用等温量热法、X射线衍射(XRD)和化学结合水量测定等方法,研究了含有不同比例的粉煤灰或磨细石英粉的复合胶凝材料在不同养护温度条件下的水化过程,观察了水化产物量和水化程度随水化龄期变化情况。在掺量相同时,矿物掺和料的种类变化不会对复合胶凝材料的初期水化过程有明显影响,其反应过程仍由其中所含硅酸盐水泥控制。活性的粉煤灰可延迟复合胶凝材料的水化反应,而惰性的石英粉则不会。热激发作用可显著促进粉煤灰的火山灰反应,但对于硅酸盐水泥的长期水化反应有抑制作用。热养护能促使水化初期生成的高含水率的CSH向低含水率的CSH变化;粉煤灰的火山灰反应生成的也是含水率较低的CSH凝胶。

Influence of active or inert mineral admixtures on the hydration characteristics of complex binder

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.