基于砖含量的再生砖混粗骨料分类研究

Classification of Recycled Brick and Concrete Coarse Aggregate Based on Brick Content

针对目前我国再生骨料分类标准适用范围窄,难以指导高砖含量再生骨料综合利用的问题,探究了砖含量对再生砖混骨料吸水率、表观密度和压碎指标等方面的影响规律,并结合现有文献资料统计分析,建立了砖含量与吸水率和压碎指标之间的一般线性关系公式。提出将砖含量作为主要分类控制指标,表观密度、吸水率和压碎指标作为技术控制指标的砖混骨料分级分类新方法。这种方法能够有效完善现有技术标准,使之与再生砖混骨料性质相适应,更加有效地指导砖混骨料在混凝土工程中的资源化利用。

The existing recycled aggregate classification standard in China is inapplicable to guide the comprehensive utilization of recycled aggregate with high brick content.The influence of brick content on water absorption,apparent density and crushing index of recycled brick and concrete aggregate was studied.Based on data analysis,a general linear relationship formula between brick content and water absorption,crushing index was established.A new classification method of recycled brick and concrete aggregate was proposed,which took brick content as main control index,as well as apparent density,water absorption and crushing index as technical control index.This method can effectively improve the existing standards and make it adapt the properties of recycled brick and concrete aggregate.Moreover,it can guide the resource utilization of recycled brick and concrete aggregate in concrete engineering more effectively.