摘要
总结了再生骨料的颗粒级配、表观密度、压碎值及吸水率等特性,分析了再生骨料对混凝土工作性能、力学性能、体积稳定性及耐久性能的影响.结果表明,再生骨料较天然骨料表观密度小、吸水率高、压碎值大.探讨了多种再生骨料强化技术,包括机械研磨、热处理、酸处理、微生物强化、碳化强化、矿物掺合料强化、纳米材料改性和聚合物浸渍等方法,并分析了各自的优缺点,以期推动再生骨料的规模化高值利用.
Abstract
The study summarizes the characteristics of recycled aggregates such as particle gradation,apparent density,crushing value,and water absorption,and analyzes the impact of recycled aggregates on the workability,mechanical properties,volume stability,and durability of concrete.The research indicates that recycled aggregates have defects such as lower apparent density,higher water absorption,and greater crushing value compared to natural aggregates.To address these defects,various strengthening technologies for recycled aggregates are discussed,including mechanical grinding,thermal treatment,acid treatment,microbial reinforcement,carbonation reinforcement,mineral admixture reinforcement,nanomaterial modification,and polymer impregnation,and their respective advantages and disadvantages are analyzed,with the aim of promoting the large-scale and high-value utilization of recycled aggregates.
维普
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