机场道面混凝土性能优化设计研究

Optimization Design of Properties of Concrete for Airport Pavement

研究了含气量和掺合料对机场道面混凝土抗弯拉强度、抗冻性和抗盐冻剥蚀性的影响.结果表明:通过引气,可显著提高其抗冻性和抗盐冻剥蚀性,且较明显地提高混凝土的抗弯拉强度;相同含气量下,干硬性混凝土抗冻性和抗盐冻剥蚀性明显低于常态混凝;为了获得较高的后期强度增长,当采用硅酸盐水泥配制混凝土时,建议掺质量分数为15%的低钙粉煤灰或矿渣粉.气泡结构参数分析数据可很好地解释这些试验结果,并证明了干硬性混凝土的引气泡稳定性和气泡结构要显著比常态混凝土差.

Effects of air content and mineral admixtures on the flexural strength, frost resistance and deicer-frost scaling resistance of airport concrete were investigated in this paper. The results show that the frost resistance and deicer-frost scaling resistance of concrete are significantly improved, and its flexural strength is enhanced by the addition of the air- entraining agent. The frost resistance and deicer-frost scaling resistance of dry concrete are much lower than those of normal concrete at a similar air content. 15% fly ash or slag is suggested to replace Portland cement in order to get a higher late strength growth. The data on the air-bubble structure parameters of the concrete can explain these results well, and prove that the air-bubble stability and air-bubble structure of the dry concrete are obviously worse than those of the normal concrete.