复合掺合料对混凝土抗冻性和抗渗性的影响

Effect of composite mineral admixtures on the frost resistance and impermeability resistance of concrete

本文研究了矿物掺合料种类及掺量对混凝土的抗冻性和抗氯离子渗透性的影响。基于本研究条件下的试验结果表明:掺入不超过25%的粉煤灰、矿渣粉和复合掺合料对混凝土的抗冻性基本无影响,均可达到F350以上;56d前,随粉煤灰掺量的增加混凝土抗氯离子渗透性降低,掺矿渣粉混凝土则刚好相反,90d龄期时均与基准混凝土接近;复合掺合料掺量为15%时,混凝土抗氯离子渗透性能最优。

This paper studied the influence of type and dosage of mineral admixtures on the frost resistance and Chloride ion permeability of concrete. Based on the experimental, it showed that frost resistance of concrete was not affected with no more than 25% of fly ash, mineral powder and composite admixture. The frost resistance of the concrete mentioned above reached F350. With the increase of the dosage of fly ash, the resistance to chloride ion penetration decreased before 56 day curing age. On the other hand, the chloride ion permeability of concrete mixed with slag showed the reversed tendency. The 90 day chloride ion permeability of concrete mixed with mineral admixtures was similar with that of the reference concrete. The concrete mixed with 15 % composite mineral admixtures showed the optimal resistance to chloride ion penetration