This paper expounds mineral composition, physical and chemical characteristics, activity and its evaluation of natural volcanic ash which is used as concrete admixture.
论述了天然火山灰用作混凝土掺合料的矿物组成、物化性能；火山灰活性及其评定。
Based on green chemistry and molecular design theory of concrete admixture, the cleaner synthesis of novel grafted polymeric concrete slump retaining agent has been studied.
以混凝土外加剂分子设计原理为指导，以绿色化学为基础，研究了新型接枝聚合物保坍剂的绿色合成工艺。
The test results show that by the joint action with the concrete admixture, the pozzolanic, micro-aggregate filling and durable effects of KGF powder can be realized properly.
在混凝土外加剂的共同作用下，KGF粉可以很好地发挥火山灰效应、微集料填充效应和耐久性效应。
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