几种火山灰质掺合料的火山灰活性研究

Study on Pozzolanic Reactivity of Several PozzolanicAdmixtures

采用酸溶法测定并比较几种典型的火山灰质掺合料的火山灰活性,探讨其火山灰反应程度对浆体强度的影响。试验结果表明,硅灰的火山灰活性最大,明显高于煤矸石和粉煤灰;煤矸石和Ⅱ级磨细粉煤灰的火山灰活性比Ⅰ级分选粉煤灰较大;酸溶法测定的煤矸石或硅灰的火山灰活性误差较大,活性偏低;掺合料火山灰的活性与其浆体强度有一定相关性。

Pozzolanic reactivity of several pozzolanic admixture were measured and compared by acid dissolution method. Effects of reaction degree of pozzolanic admixture on strength of paste were discussed.Experimental results show that pozzolanic reactivity of silica fume is the highest and that of grade I fly ash is the lowest. For silica fume and coal slack, the error value of measure by acid dissolution method is big and the reaction activity is lower. Relativity is shown between pozzolanic reactivity of pozzolanic admixture and its strength of paste.