Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 203, Issue -, Pages 601-607Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.01.071
Keywords
Recycled aggregate; Mixing method; ITZ; Compressive strength
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Funding
- 13th Five-Year State Key Development Program [2016YFB0303505]
- Natural Science Foundations of China [51672108]
- Key Research and Development Plan of Shandong Province [2018GGX107009]
- Enterprise Corporation Project [W17139]
- 111 Project of International Corporation on Advanced Cement-based Materials [D17001]
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Due to the existence of two weaknesses in the ITZ, the performance of recycled aggregate concrete (RAC) is much lower than that of natural aggregate concrete. An optimized triple mixing (OTM) method was developed to strengthen the ITZ in the RAC in this paper. It was found that OTM could dramatically improve the compressive strength, freezing and thawing resistance and water impermeability of the RAC. The reason is that supplementary cementitious materials (SCMs) filled the ITZ in the RAC prepared by OTM. Additionally, SCMs formed a thin and dense layer to coat the recycled aggregate, which was beneficial in terms of strengthening the ITZ structure of the RAC. In addition, OTM was beneficial for the dispersion of SCMs in the ITZ, even if the amount of the mixing water was not sufficient. (C) 2019 Elsevier Ltd. All rights reserved.
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