轻质自防水混凝土的研究

Lightweight Self-waterproof Concrete

本文采用新型双膨胀源膨胀剂以及不同密度等级、不同类型的轻骨料配制轻质自防水混凝土,并对其工作性、物理力学、变形等性能进行了研究。研究结果表明,轻质自防水混凝土的工作性与轻骨料吸水率、形貌、级配、密度等性质密切相关;相同水胶比下,抗压强度取决于轻骨料的筒压强度;轻骨料的吸水特性对膨胀剂有增益作用,在膨胀剂与轻骨料的相互作用下,轻质自防水混凝土限制膨胀率大幅提高,干燥收缩得到明显抑制。

Lightweight self-waterproof concrete(LSWC) was made by double expansion resource expansive agent and lightweight aggregate(LA) of different density degree and type. Workability, physical mechanics, and deformation of LSWC were investigated. The results show that workability of LSWC is closely related to water absorption, shape, gradation, and density of LA. Compressive strength of LSWC depends on cylinder compressive strength of LA when with a fixed water to binder ratio. Water absorption of LA can result in prolonging of expansion rate.In the interrelationship between expansive agent and LA, restrained expansion rate of LSWC grows significantly, and drying shrinkage is obviously inhibited.