Bulletin of the Chinese Ceramic Society, Volume. 43, Issue 11, 4019(2024)

Effect of Curing Process on Properties of Sand-Free Macroporous Recycled Concrete

XU Chenyang1, ZHANG Zhizhu1, ZHANG Pengfei1, LI Qiuyi1,2、*, KONG Zhe3, GUO Yuanxin1, and CHEN Mingxu1
Author Affiliations
  • 1School of Architecture Engineering, Qingdao Agricultural University, Qingdao 266109, China
  • 2School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
  • 3School of Civil Engineering, Qingdao City University, Qingdao 266106, China
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    To address the waste of natural aggregates and limited application of recycled aggregates, this study prepared sand-free macroporous recycled concrete using natural and recycled aggregates. Macro and micro properties of dry, water spraying, and coating sand-free macroporous recycled concrete were investigated via mechanical properties, microhardness, scanning electron microscopy, and X-ray diffraction analysis. The results show that different curing processes affect the hydration reaction of ordinary Portland cement, and sand-free macroporous recycled concrete “honeycomb” structure and recycled aggregate characteristics complicate the hydration process. The best curing method is coating, followed by dry, while water spraying is least effective. Microhardness and scanning electron microscopy tests reveal that the free water absorption in matrix increases during water spraying, resulting in concrete expansion, deteriorating adhesion of aggregate-cement interface and decreasing hardness. X-ray diffraction analysis results confirm the effects of curing methods on sand-free macroporous recycled concrete via composition of hydration products like portlandite.

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    XU Chenyang, ZHANG Zhizhu, ZHANG Pengfei, LI Qiuyi, KONG Zhe, GUO Yuanxin, CHEN Mingxu. Effect of Curing Process on Properties of Sand-Free Macroporous Recycled Concrete[J]. Bulletin of the Chinese Ceramic Society, 2024, 43(11): 4019

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    Paper Information

    Category:

    Received: Mar. 20, 2024

    Accepted: Jan. 2, 2025

    Published Online: Jan. 2, 2025

    The Author Email: Qiuyi LI (201801001@qau.edu.cn)

    DOI:

    CSTR:32186.14.

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