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Volume 52 Issue 2
Feb.  2022
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Article Navigation >  INDUSTRIAL CONSTRUCTION  > 2022  >  52(2): 133-138,157
Li Yi, Zhao Wen, Yan Yunqi. METHOD OF CONTINUAL ANALYSIS FOR SYSTEM RELIABILITY[J]. INDUSTRIAL CONSTRUCTION, 2005, 35(10): 26-28,39. doi: 10.13204/j.gyjz200510009
Citation: 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
shu

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

doi: 10.13204/j.gyjzG21062503

  • 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
  • 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.
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