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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2023, Vol. 42 ›› Issue (12): 4183-4196.

• Cement and Concrete •     Next Articles

Research Progress on Influence of Parent Concrete Strength on Properties of Recycled Aggregate and Recycled Aggregate Concrete

CHEN Chunhong1,2, CHEN Yunchun1, WANG Lei1, YU Jiang1, ZHU Pinghua1, LI Haichao1, XU Lingjie1, WANG Cijian1, QIAO Sen3   

  1. 1. School of Urban Construction, Changzhou University, Changzhou 213164, China;
    2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China;
    3. Shandong Yongfu Construction Group Co., Ltd., Zaozhuang 277102, China
  • Received:2023-07-27 Revised:2023-09-18 Online:2023-12-15 Published:2023-12-12

Abstract: The use of recycled aggregate obtained from the crushing of construction solid waste can not only save natural sand and gravel resources, but also promote the recycling of construction solid waste. The quality of recycled aggregate determines the performance of recycled aggregate concrete. There are many factors affecting the quality of recycled aggregate, and the strength of parent concrete is one of the important influencing factors. The article takes strength of parent concrete as the research object, and summarizes its influence law on the properties of recycled aggregate and recycled aggregate concrete. Different strengths of parent concrete affect the quality and content of recycled aggregate adhesive mortar, which in turn affects the properties of recycled aggregate and recycled aggregate concrete. When the strength of parent concrete increases, the quality and content of adhesive mortar are improved. While the quality of adhesive mortar is improved, the properties of recycled aggregate and recycled aggregate concrete are strengthened. The increase in the content of adhesive mortar deteriorates the physical properties of recycled aggregate, increases the porosity and water absorption of recycled aggregate, but strengthens the internal curing effect of concrete, which contributes to the mechanical properties of recycled aggregate concrete. Using microscopic analysis, it is found that different strength of parent concrete make a difference in the content of hydration products in the interfacial transition zone of recycled aggregate concrete, which has an impact on the mechanical properties of concrete. The article provides a theoretical basis for further grading and utilization of recycled aggregate.

Key words: recycled aggregate, recycled aggregate concrete, parent concrete strength, physical property, mechanical strength

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