三峡工程高性能大坝混凝土配合比设计技术措施

摘要

In this paper, the measures adopted in the design of concrete mix for the dam in ThreernGorges Project are described. The technical measures include high quality water reducing agent,rnair entrainment additive, first grade fly ash, micro-expensive middle heat cement, controllingrnthe alkali content in raw material and concrete, reducing the water-cement ratio, increasingrnthe amount of fly ash. These measures efficiently lowered the water requirement, improved thernworkability and durability as well as the volume stability of concrete. High performancernconcrete for dam is attained.%本文介绍了三峡工程大坝混凝土配合比设计思想及采取的技术措施.通过采用优质缓凝高效减水剂、引气剂、Ⅰ级rn粉煤灰、具有微膨胀性质的中热水泥、限制原材料及混凝土中总碱含量、并缩小水胶比、增大粉煤灰掺量等综合措施和技术rn路线，有效地降低了混凝土用水量，改善了混凝土工作性，保证了混凝土抗冻耐久性，提高了混凝土的体积稳定性，实现了rn高性能大坝混凝土的目标.