天然火山灰掺合料在水电工程中的应用

Use of Natural Pozzuolanic Admixture in Construction of Hydropower Projects

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。分析了江腾火山灰作为天然火山灰掺合料对混凝土的改性作用及掺合效能:可降低混凝土水化热绝热温升,减小混凝土需水量,降低混凝土干缩,提高混凝土耐久性。结合试验成果与实际工程应用,与粉煤灰掺合料在掺合效果、经济成本方面作出比较分析。

This paper expounds mineral composition, physical and chemical characteristics, activity and its evaluation of natural volcanic ash which is used as concrete admixture. The paper also makes an analysis of concrete performance improvement and admixing effect after using Jiangteng volcanic ash as natural volcanic ash admixture of concrete. The pozzuolanie admixture can lower thermal insulation temperature rise of concrete hydration heat, reduce water demand and drying shrinkage of concrete, and improve concrete durability. The paper finally makes an analysis in terms of admixing effect and cost as compared with fly ash admixture.