泡沫陶瓷对混凝土抗压强度及微观性能研究

Study on the Compressive Strength and Microscopic Properties of Foamed Ceramics on Concrete

摘要: 为了探究泡沫陶瓷轻骨料对混凝土抗压强度及微观性能的影响，本文通过0%，10%、20%、30%的泡沫陶瓷轻骨料等体积取代普通碎石骨料的方式，对3、7、14、28 d混凝土的表观密度、破坏形貌及抗压强度、SEM进行检测，探究泡沫陶瓷轻骨料取代率及龄期对混凝土抗压强度及微观结构的影响。结果表明：表观密度随泡沫陶瓷取代率的增加呈线性减小关系；随取代率增加，混凝土破坏界面泡沫陶瓷轻骨料数量增多；混凝土抗压强度随龄期呈增加的趋势；随取代率增加，抗压强度呈先增大后减小的趋势；根据SEM观察，泡沫陶瓷轻骨料增强了界面之间的粘结力，同时提高了水泥的水化程度。

Abstract: In order to explore the effect of foamed ceramic lightweight aggregate on the compressive strength and microscopic properties of concrete, this paper replaces ordinary crushed stone aggregate with equal volume of 0%, 10%, 20%, 30% foamed ceramic lightweight aggregate. The apparent density, failure morphology, compressive strength and SEM of concrete at 3 d, 7 d, 14 d, and 28 d were examined, and the effects of the substitution rate and age of foamed ceramic light aggregate on the compressive strength and microstructure of concrete were investigated. The results show that: the apparent density decreases linearly with the increase of the substitution rate of foamed ceramics; as the substitution rate increases, the amount of foamed ceramic lightweight aggregate at the interface of concrete failure increases; the compressive strength of concrete increases with age; with the substitution rate increases, the compressive strength increases first and then decreases. According to SEM observation, the foamed ceramic lightweight aggregate enhances the adhesion between the interfaces and increases the hydration of the cement.