受污染河水中碱金属离子对混凝土的影响  

Influence of alkali metal ions on concrete in polluted river water

作　　者：郭利民 GUO Limin(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi 'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司

出　　处：《水利建设与管理》2019年第6期17-20,共4页Water Conservancy Construction and Management

摘　　要：随着经济发展,河流受到的污染逐渐增大,河水中的碱金属离子逐年升高。这些离子对混凝土有侵蚀作用,对混凝土的耐久性会产生影响。为研究碱金属离子对混凝土性能的影响,本文设计基础试验,分别采用复合离子溶液、单阳离子溶液、双阳离子溶液进行研究。结果表明:所有碱金属离子都会导致混凝土体积膨胀,而Ca2+在前期膨胀中占主导作用,过量的Ca^2+会导致混凝土膨胀开裂;Na^+、K^+在后期混凝土体积膨胀中占主导作用。The pollution of the river increases gradually, and the alkali metal ions in the river increases year by year with the development of economy. These ions have an erosive effect on concrete, which will affect the durability of concrete. Basic test is designed in the paper in order to study the influence of alkali metal ions on the performance of concrete, which is divided into composite solution, single ion solution and double ion solution. The results show that all alkali metal ions will lead to concrete volume expansion, and Ca^2+ has a dominant role in the early expansion, excessive Ca 2+ will lead to concrete expansion cracking. Na^+ and K^+ play a dominant role in later concrete volume expansion.

关 键 词：混凝土 碱金属离子 混凝土体积膨胀 

分 类 号：TV431[水利工程—水工结构工程]