【摘要】 硫酸盐侵蚀造成的工程危害越来越受到工程界的重视,本文从理论分析的角度阐述了硫酸盐侵蚀的破坏原理。研究表明:钙矾石作为对混凝土力学性能具有破坏作用的膨胀性物质,它广泛的存在于混凝土材料中,早期的水泥水化反应生成的钙矾石由于硫酸盐数量极少,一般是以单硫型硫铝酸钙(AFm)的形式存在,随着硫酸盐数量的增加,根据钙矾石(AFt)与单硫型硫铝酸盐(AFm)的比值的不同,混凝土中的钙矾石有三种不同的存在状态。滞后钙矾石的形成以及稳定区域受孔隙中温度和含碱量的影响很大,常温下AFt比较稳定,但是在高温下AFm要比AFt更稳定。但是,无论是在何种温度及碱度下,硫酸盐的含量是决定钙矾石存在形式的决定因素。更多还原

【Abstract】 More and more attention is paid to the engineering hazards caused by erosion of sulfate in engineerings.Here,the theoretical analysis is used to expound the destructive principle of sulfate attack.The research results show that as the expansion substances which would destruct the mechanical properties of concrete,the ettringite exists in the concrete materials widely.In the early cement hydration reaction,the ettringite would exist as a single sulfur type of sulphoaluminate(AFm) because of the small quantity of sulfate.But with the increase in the number of sulfate,the ettringite(AFt) would have three different states in the concrete according to the ratio of ettringite(AFt) to the single sulfur-based sulphoaluminate.The formation and stable region of delayed ettringite are affected greatly by the temperature and alkali in pore and the AFt is stable at room temperature,but at high temperature,the AFm is more stable than the AFt.However,no matter what the temperature and alkalinity may be,the sulfate is the deciding factor to determine the ettringite form.更多还原