辅助胶凝材料和外加剂对海工混凝土耐腐蚀性的影响

Effect of different admixtures and SCMs on the corrosion resistance of concrete for marine engineering

耐海水腐蚀性是海工混凝土最重要的性能。研究了不同掺合料和外加剂对混凝土抗氯离子侵蚀性和硫酸盐侵蚀性的影响,提出了以经济性和可行性为前提提高混凝土的耐海水腐蚀性能的最优配合比。试验发现,掺合料的掺量越大对提高混凝土抗蚀性越有利,其中,矿渣的改善效果较粉煤灰要好。对比几种提高混凝土抗蚀性措施发现,其改善能力为硅粉>膨胀剂>引气剂>防水剂。硅粉由于具有良好的填充作用和高火山灰活性的优点,成为改善混凝土抗氯离子侵蚀性能最理想的矿物外加剂,但是其价格过高,使用后混凝土和易性不易控制,通常提倡使用改善效果稍差的膨胀剂。

The most important performance of concrete for marine engineering is the corrosion resistance.The effects of different supplementary cementing materials（SCMs） and additive on the performance of anti-corrosive chloride ions and sulphate resistance are studed.An optimal mix proportions is put forward on the basis of economy and feasibility.According to the results, more SCMs, the greater performance.Slag is better than fly ash.Comparison of several measures to improve the corrosion resistance of concrete, the ranking is found：silica fume,expanding agent, air entraining agent,waterproof agent.Silica fume is the most appropriate admixtures for its good filling and activity of volcanic ash.But for it＇s expensive and not easy to control, expanding agent is usually promoted.