摘要
混凝土侵蚀的主要原因是水泥石遭受了侵蚀,外界环境中的侵蚀介质(如硫酸盐及镁盐)通过水泥石开口孔隙进入到水泥石内部,与水泥石中易分解于软水的成分如氢氧化钙、水化铝酸钙等反应生成钙矾石或石膏等侵蚀产物,钙矾石体积膨胀和石膏结晶膨胀都会引起水泥石结构的开裂,继而造成混凝土的破坏。由于高性能混凝土掺加了高效减水剂和大掺量超细掺合料并采用低水胶比配制混凝土,使得这种混凝土中水泥石的孔隙减少,而且缩小了孔径;同时大掺量超细掺合料可以大大减少水泥石内的不稳定成分,从而使高性能混凝土抗侵蚀性能得以提高。
The main erosion of the concrete is the cement stone.With the material of the corrosion （such as sulphate and bitter salt）,the environmental water enters into the inside of the cement stone through the open pores.The material of the corrosion reacts with CH and CAH,then produces AFt and CaSO4·2H2O.These products swell the structure of the cement stone and then destroy the concrete.The high-performance concrete which with high-efficient water-reducing agent,heavy admixtures and lower water gelled material ratio becomes close-grained,so the quantity of the pores is less,and the diameter of pores turn smaller.Meanwhile,heavy admixtures can reduce the instability composition of the cement stone greatly.So the high-performance concrete has excellent anti-corrosion.
出处
《混凝土》
CAS
CSCD
北大核心
2010年第5期21-24,共4页
Concrete
基金
新疆水利水电工程重点学科基金资助(xjzdsk-2002-10-05)
新疆高校科研计划重点项目(xjedu2005I09)
关键词
侵蚀
硫酸盐
高性能混凝土
抗侵蚀性
corrosion
sulphate
high-performance concrete
anti-corrosion
