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研究了配合比与养护温度对水泥窑灰(cement kiln dust,CKD)—粉煤灰(fly ash,FA)净浆的水化与强度发展的影响。净浆采用5种不同的水泥窑灰与粉煤灰比例配制,部分试件添加硅酸盐水泥作添加剂。试件在24、38℃及50℃的条件下进行养护。采用热重分析与X射线衍射测试试件的水化产物。结果表明在50℃的养护条件下,75%CKD+25%FA与45%CKD+45%FA+10%OPC试件的28 d与56 d强度分别达到了100%OPC水泥净浆强度的70%与80%以上。CKD-FA体系中的主要结晶水化产物是钙矾石。无论CKD与FA比例多大,CKD-FA浆体中钙矾石的含量显著高于水泥净浆。CKD-FA体系中钙矾石在90d的龄期仍可保持稳定。
The effects of mixing ratio and curing temperature on hydration and strength development of cement kiln dust (CKD) - fly ash (FA) paste were studied. Net pulp with 5 different types of cement kiln dust and fly ash ratio preparation, part of the sample added Portland cement as additive. Specimens were cured at 24, 38 and 50 ° C. Thermogravimetric analysis and X-ray diffraction were used to test the hydration products of the test pieces. The results showed that the strength of 75% CKD + 25% FA and 45% CKD + 45% FA + 10% OPC specimens reached the net strength of 100% OPC cement at 70 ℃ and 56 days under the curing condition of 50 ℃ % And 80% or more. The main crystalline hydration product in the CKD-FA system is ettringite. Regardless of CKD-FA ratio, the content of ettringite in CKD-FA slurry was significantly higher than that of cement paste. In the CKD-FA system, ettringite remained stable at 90 days.