自磨改性对再生粗骨料及再生混凝土性能的影响

doi:10.11896/cldb.22020144

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Abstract Anew modification technology (self-grinding modification) of recycled coarse aggregate was proposed. The influence laws of self-grinding modification on the properties of recycled coarse aggregate and recycled concrete were systematically studied, the influence laws of the recycled micro-powder on the workability and mechanical properties of recycled concrete when it adhered to the surface of recycled aggregate was explored. The results revealed that the self-grinding modification could effectively improve the particle shape and the interface morphology of recycled coarse aggregate, which is benefit to the stripping of the attached mortar on the surface. After modification, the apparent density of recycled coarse aggregate was increased by 9.7%, the crushing index and water absorption are reduced by 37.6% and 51.4% respectively, the fluidity and cohesion of the prepared recycled concrete were improved, and the compressive strength of recycled concrete was effectively enhanced. Recycled micro-powders had the small particles, loose and porous surface, and it presented the micro-aggregate filling effect and pozzolanic activity, which could effectively improve the later compressive strength of recycled concrete.

Key words： self-grinding modification recycled coarse aggregate recycled concrete recycled micro-powder second hydration

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TU528

Fund:National Natural Science Foundation of China (52172027).

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	LIN Yike
	HE Tingshu
	DA Yongqi

Cite this article:

LIN Yike,HE Tingshu,DA Yongqi. Influence of Self-grinding Modification on the Properties of Recycled Coarse Aggregate and Recycled Concrete[J]. Materials Reports, 2023, 37(16): 22020144-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22020144 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22020144

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