废弃玻璃在混凝土中的应用研究进展

Research Progress on the Application of Waste Glass in Concrete

对废弃玻璃在混凝土中的应用研究进展进行了综述。废弃玻璃在混凝土中可作为骨料和掺合料使用。作为骨料使用时,废弃玻璃内部的裂纹会引起碱骨料反应,可通过在混凝土或砂浆中加粉煤灰、玻璃粉等加以解决。玻璃的碱骨料反应效应随其颗粒度减小而减小,颗粒度减小到一定程度,玻璃颗粒产生火山灰活性。和粉煤灰相比,玻璃粉的火山灰活性在低龄期时较为明显。混凝土中用一部分玻璃粉替代水泥,其长期抗氯离子渗透能力和抗硫酸盐侵蚀能力上升。玻璃颗粒和玻璃粉在混凝土方面的应用价值,还和国家环保政策和区域有关系。

The research progress on the application of waste glass in concrete was reviewed. Waste glass has been reused both as aggregate and supplementary cementitious materials in concrete. The intrinsic cracks of the waste glass aggregate have been found to result in ASR in concrete and the ASR effect was supposed to be suppressed by replacement of some cement with fly ash or glass powder in concrete. As the particle size became smaller, waste glass became less in ASR effects and of more pozzalanic reactivity. The pozzolanicity of glass powder was better than that of fly ash in concrete at earlier age. The long term resistance of concrete to both chlorine penetration and sulfate attack was suppressed when a part of cement was replaced by glass powder. The application of glass aggregate and glass powder in concrete was closely related to both the national environmental policy and the region concerned in China.