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为提高再生骨料的性能,使之适用于自密实混凝土,使用4种强化手段对简单破碎后的两种来源再生骨料进行改性处理,研究其对新配RA-SCC工作性能和硬化后物理力学等性能的影响.结果发现:骨料来源和原生混凝土强度对再生骨料的品质有较大影响,而经过改性处理以后,不同来源的再生骨料品质都有所提升,所制成的RA-SCC性能差异变小;裹浆法以及水玻璃浸泡的方法能够较大程度地改善新拌RA-SCC的自密实性能;高温煅烧法、酸性溶液浸泡法、水玻璃分散技术可使硬化后的RA-SCC内部结构更加致密,从而明显改善了RA-SCC的抗拉强度、抗干燥收缩性能和抗冻性能,但大部分骨料增强技术对RA-SCC的抗压强度和弹性模量的影响较小.
In order to improve the performance of recycled aggregates and make them suitable for self-compacting concrete, four kinds of strengthening methods were used to modify the two kinds of regenerated aggregates after simple crushing, to study their performance on newly formulated RA-SCC and the hardened Physical mechanics and other properties.The results show that: the aggregate source and the strength of the primary concrete have a greater impact on the quality of recycled aggregate, and after modification, the quality of recycled aggregate from different sources have improved, made of Of the RA-SCC performance difference becomes smaller; Wrap method and water glass immersion method can largely improve the self-compacting performance of the fresh RA-SCC; high temperature calcination method, acid solution immersion method, water glass dispersion technology can make the hardening The internal structure of RA-SCC was more compact, which significantly improved the tensile strength, drying shrinkage and frost resistance of RA-SCC. However, the compressive strength and elastic modulus of most of RA-SCC Less affected.