玻璃混凝土及其织物增强薄板试验研究

Experimental study on glass concrete and textile reinforced glass concrete sheets

玻璃混凝土的研制,不仅开辟了废玻璃回收利用的新途径,而且节约了有限的砂石资源。为探索废玻璃作为混凝土骨料的可行性,开发织物增强玻璃混凝土薄板。首先,通过比较砂骨料和玻璃骨料混凝土的强度、变形随时间变化的特征,研究在玻璃混凝土拌合料中掺入适量偏高岭土超细粉末对碱-硅反应(ASR)的抑制作用;然后,分别制作出预应力和非预应力的碳纤维织物增强砂骨料、玻璃骨料混凝土薄板,并对四种类型的薄板进行拉伸、弯曲、和织物与混凝土之间的界面黏结性能试验。研究表明,掺入适量的偏高岭土超细粉末,能抑制玻璃混凝土中的碱-硅反应,并能制作出变形稳定、后期强度较高的细骨料玻璃混凝土;预应力和非预应力玻璃骨料混凝土薄板与砂骨料混凝土薄板相比,具有较好的抗拉、抗弯和界面黏结性能。

The study on glass concrete not only opens up a new way for waste glass recycling, but also saves the limited resources of sand and stone. In order to explore the feasibility of waste glass as aggregate in concrete and develop textile reinforced glass concrete sheets, through comparing the characteristics of the strength and deformation variations with age of glass concrete with that of sand concrete, the inhibitory effect of ultra-fine metakaolin powder on alkali-silica reaction （ASR） of the glass concrete was studied, and the prestressed and non-prestressed carbon textile reinforced concrete sheets with sand and glass as aggregates were fabricated, respectively, tests on the tensile, bending and interfacial bond properties of the four types of sheets were carried out. The results indicate that, alkali-silica reaction is restrained by adding a proper amount of ultra-fine metakaolin powder in glass concrete, making it possible to prepare fine aggregate glass concrete with stable deformation and high post-strength. Compared to the textile reinforced concrete sheets with sand as aggregate, prestressed or non-prestressed, the glass concrete sheets have better properties of tensile, flexural and interracial bond.