|Table of Contents|

Effect of recycled fine aggregate on properties of alkali-activated recycled concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2026年02期
Page:
74-85
Research Field:
建筑材料
Publishing date:

Info

Title:
Effect of recycled fine aggregate on properties of alkali-activated recycled concrete
Author(s):
CHEN Longxiang1;  YANG Dingyi1; 2;  LIU Miao1;  LU Shimin1;  YANG Kailu1;  MAO Xiang1;  ZHAO Jian1
(1. School of Civil Engineering and Transportation, Yangzhou University, Yangzhou 225127, Jiangsu, China; 2. Research Institute of Green Building Materials, Yangzhou University, Yangzhou 225127, Jiangsu, China)
Keywords:
recycled fine aggregate;  recycled coarse aggregate;  alkali-activated recycled concrete;  macroscopic phenomena;  microstructure
PACS:
TU443
DOI:
10.19815/j.jace.2024.10102
Abstract:
To accelerate the low-carbon development of construction materials and achieve full waste recycling in concrete production, alkali-activated recycled concrete was taken as the research object, and the effects of different replacement ratios of recycled fine aggregate(RFA)on its macroscopic properties and microstructure were systematically evaluated. Through the test of workability, physical and mechanical properties, microstructural characteristics, and damage evolution, the mechanism of RFA was discussed. The results show that the use of RFA have adverse effects on the workability, dry apparent density, capillary water absorption, and porosity of alkali-activated recycled concrete to a certain extent. For ultrasonic pulse velocity and mechanical performance, there is an optimal replacement ratio of 50% for RFA. When the RFA replacement ratio is 100%, the deterioration in mechanical properties does not exceed 20%, and the overall performance degradation is small, suggesting that it has good applicability in alkali-activated systems. The incorporation of recycled coarse aggregate further aggravates performance deterioration and has a more pronounced influence on structural compactness and failure morphology. Microstructural analysis reveals that calcium carbonate in RFA reacts with the alkaline solution to form gel products, which partially compensates for matrix defects. The addition of recycled aggregates blurry the stage characteristics of compressive failure and lead to more complex crack propagation behavior. The research findings can not only provide theoretical support for the application of alkali-activated recycled concrete, but also provide reference for the utilization strategy of recycled aggregate.

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Last Update: 2026-04-01