掺合料对引气混凝土抗冻性的影响研究

Research on influence of admixtures on frost-resistance of air-entraining concrete

抗冻性是表征混凝土耐久性的关键指标之一,为了提高混凝土的耐久性,混凝土通常需要掺入适量的矿物掺合料,利用其微集料效应、玻璃微珠效应和火山灰效应,不仅有助于大幅度提高混凝土的抗冻性,还可以改善混凝土的抗渗性、抗氯离子渗透和抗碳化性能。研究了粉煤灰和矿渣粉的掺入对新拌混凝土和易性和硬化混凝土强度以及抗冻性的影响,研究结果表明:无论是单掺粉煤灰、单掺矿渣粉,还是两者复掺,都能够一定程度上改善引气混凝土的和易性和抗冻性。

Frost-resistance is one of the key indicators with regard to durability of concrete.In order to improve the durability of con- crete, appropriate amount of admixtures were generally required which could also elevate impermeability, resistance to chloride ion and anti-carbonation of concrete.This paper had investigated influence of fly ash and ground granulated slag on workability, strength and frost-resistance of concrete, and the results indicated that incorporation of either fly ash, ground granulated slag or both, could improve the workability and.frost-resistance of air-entraining concrete to a certain extent.