Study on Mechanical Properties and Microstructure of Recycled Aggregate Concrete Containing Steel Slag Powder and Metakaolin

LIU Yejin; ZHOU Changshun

doi:10.13204/j.gyjzG21062503

Volume 52 Issue 2

Feb. 2022

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LIU Yejin, ZHOU Changshun. Study on Mechanical Properties and Microstructure of Recycled Aggregate Concrete Containing Steel Slag Powder and Metakaolin[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(2): 133-138,157. doi: 10.13204/j.gyjzG21062503

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Study on Mechanical Properties and Microstructure of Recycled Aggregate Concrete Containing Steel Slag Powder and Metakaolin

doi: 10.13204/j.gyjzG21062503

LIU Yejin¹,
ZHOU Changshun^{2,3
,
,}

1. College of Architecture and Design Art, Shaoxing Vocational and Technical University, Shaoxing 312000, China;
2. Yuanpei College, Shaoxing University, Shaoxing 312000, China;
3. Civil Engineering College, Central South University, Changsha 430100, China

Received Date: 2021-06-25
Available Online: 2022-06-30
Publish Date: 2022-02-20

Abstract

Abstract

To improve the utilization rate of steel slag powder (SSP) as mineral admixture in cement-based materials, and to enhance the mechanical properties of recycled aggregate concrete (RAC), the influences of SSP and MK on the mechanical properties and microstructure of RAC were studied. The mechanical test results showed that the compressive strength of the mineral admixture at 28 d and 90 d was respectively increased by 13.3% and 18% as the mass fraction of MK in mineral admixture was 30%, compared with that of the reference group, and the changing trend of elastic modulus was similar to that of the compressive strength. Microstructural tests indicated that SSP and MK mixed with Ca(OH)₂ decreased the peak strength, generated additional C-S-H gel and increased the percentage of high density C-S-H, which significantly improved the microstructure and interfacial transition zone of RAC in the later stage. These were attributed to the better volcanic ash activity and micro-aggregate filling effect of SSP and MK mixed mixture.
- recycled aggregate concrete,
- metakaolin,
- steel slag powder,
- mechanical properties,
- microstructure

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References(24)

References

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