Analysis of Pore Structure and Mechanical Properties of Recycled Concrete with Full Replacement of Coarse Aggregate

Abstract

Abstract: In order to improve the utilization rate of construction waste, large liquidity recycled concrete was prepared using recycled coarse aggregates with significant differences in properties from two sources to meet engineering needs. The effects of different quality recycled coarse aggregates and mineral admixtures on workability, mechanical properties and pore structure of recycled concrete were studied under the full replacement of coarse aggregates, and the optimal ratio was determined. The results show that recycled coarse aggregates contain more cracks than natural aggregates. After adding fly ash and mineral powder, some particles fill the gaps inside aggregates, which is beneficial for improving workability of concrete, but not conducive to development of concrete strength. The analysis of pore structure shows that the smaller percentage of bubble volume and the larger percentage of beneficial bubbles, the more favorable it is for concrete. Taking into account various performance factors, it is recommended that the optimal mix ratio is 10% (mass fraction, the same below) fly ash and 5% mineral powder. The workability of recycled concrete meets the requirements of large liquidity and the strength meets the requirements of C30 strength grade.

Key words: recycled coarse aggregate, recycled concrete, mineral admixture, mechanical proporty, pore structure, bubble pore size, large liquidity

CLC Number:

TU528

ZHANG Yudong, ZHANG Jiashuai, JIA Jilong, LI Xiaochen, HUO Gang, XIE Long, MENG Zhipeng, GAO Yuzeng, CAO Yingzhuo. Analysis of Pore Structure and Mechanical Properties of Recycled Concrete with Full Replacement of Coarse Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 3005-3016.

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