盐碱溶液对混凝土碳化性能的影响

Influence of Saline-Alkaline Solution on Concrete Carbonation

基于盐碱寒冷地区的工程环境与混凝土的配制特点,模拟配制了盐碱(SA)溶液,对水灰比、含气量和粉煤灰掺量三个因素对混凝土碳化性能的影响进行了正交试验研究.结果表明:水灰比、含气量和粉煤灰掺量三个因素对混凝土碳化性能影响的顺序是水灰比最大,含气量次之,粉煤灰掺量最小;盐碱溶液侵蚀产生膨胀性裂缝和溶解碱组分的双重作用,改变了水灰比、含气量和粉煤灰掺量影响混凝土碳化性能的顺序,即水灰比最大,粉煤灰掺量次之,含气量最小;无论经过盐碱溶液的侵蚀与否,各因素影响混凝土碳化性能的规律是一致的,即随着水灰比、含气量、粉煤灰掺量的增加,碳化深度增大.

Based on the compounding characteristic of concrete in cold saline-alkaline（SA） zone, an orthogonal experiment was carried out to study the influence of water-cement ratio, entrained air content and content of fly ash on the carbonation performance of concrete. Water-cement ratio has the greatest effect on carbonation, next comes entrained air content followed by content of fly ash; expansion crack caused by SA solution erosion and SA solution＇ s dissolving alkali component can change their influence, with water-cement ratio still having the greatest effect and content of fly ash followed by entrained air content; whether subjected to SA solution erosion or not, the influence trend of each factor on carbonation of concrete is the same： with the increasing of water-cement, entrained air content and content of fly ash, the depth of carbonation increases.