Abstract
Alkali-activated slag recycled coarse aggregate concrete (AAS-RAC) is a novel type of green building material with significant growth potential, utilizing waste slag and construction waste effectively. However, its large shrinkage and poor toughness limit its further utilization. Adding fiber is the crucial way to limit its shrinkage. Therefore, the effects of fiber type and content on the shrinkage performance of AAS-RAC were systematically studied. The results show that the incorporation of recycled aggregate increases the shrinkage of AAS-RAC, and AAS-RAC of full recycled aggregate is 59% higher than that of undoped aggregate. The addition of steel fiber, polypropylene fiber and basalt fiber can effectively reduce the shrinkage of AAS-RAC. Among them, steel fiber has the best inhibition effect, and 0.6% steel fiber can reduce the shrinkage of AAS-RAC by 30.6%. The AAS-RAC shrinkage model considering the influence of fiber content and recycled aggregate is established. The research results provide an effective way to reduce the shrinkage of AAS-RAC.
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Acknowledgements
The Central Guidance Local Science and Technology Development Project of Hebei Province (Project No. 236Z4505G), the National Natural Science Foundation of China (Project No. 52108132), the Colleges and Universities in Hebei Province Science and Technology Research (Project No. QN2021037), The China construction first bureau (Group) Co., Ltd. technology research and development platform projects (Project No. PT-2022-10).
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Yunhe Li and Yinbo Liu designed and participated in the experiment; Pang Chen and Yunhe Li designed and wrote the paper; Zaixian Chen, Xinghao Liu and Zhaomeng Liu made comments and amendments to the paper. All the authors analyzed the data and contributed to writing the paper.
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Li, Y., Chen, P., Chen, Z. et al. Influence of fiber on the shrinkage performance of alkali-activated slag recycled concrete. Arch. Civ. Mech. Eng. 24, 153 (2024). https://doi.org/10.1007/s43452-024-00966-x
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DOI: https://doi.org/10.1007/s43452-024-00966-x