Author:
Chen Yuzhi,Ning Yingjie,Chen Xudong,Xuan Weihong,Guo Yuzhu
Abstract
AbstractThis study addresses the meso-structure of recycled aggregate concrete with different admixture and c;uring condition. The RCA (Recycled concrete aggregate) with admixture of slag power and fly ash and curing condition of steam was casted. X-ray CT (Computed tomography) was used to obtain meso-structure of RCA, and the pore structure, aggregate, and interface traction zone were analyzed. The results show that steam curing not only increases the pore volume but also makes the pore morphology more complex, the fractal dimension increases, the proportion of spherical pores decreases, and the pores develop from spherical to flat and slender with the increase of steam curing temperature. The porosity of micron pores in recycled aggregate concrete is about 2.3%, in which the pores with aperture less than 300 μm accounts for more than 85%. The thickness of the interface area between recycled aggregate and new mortar is about 200 μm, and the crack width in recycled aggregate is about 300– 400 μm.
Funder
Jiangsu Industry University Research Cooperation Project
Scientific Research Foundation for High-Level Talents of Jinling Institute of Technology
Publisher
Springer Science and Business Media LLC
Subject
Ocean Engineering,Civil and Structural Engineering
Reference23 articles.
1. Chandrappa, A. K., & Biligiri, K. P. (2018). Pore structure characterization of pervious concrete using X-ray microcomputed tomography. Journal of Materials in Civil Engineering, 30, 04018108. https://doi.org/10.1061/(ASCE)MT.1943-5533.0002285
2. de Andrade Salgado, F., & de Andrade Silva, F. (2022). Recycled aggregates from construction and demolition waste towards an application on structural concrete: A review. Journal of Building Engineering, 52, 104452. https://doi.org/10.1016/j.jobe.2022.104452
3. Gonzalez-Corominas, A., Etxeberria, M., & Poon, C. S. (2016). Influence of steam curing on the pore structures and mechanical properties of fly-ash high performance concrete prepared with recycled aggregates. Cement Concrete Composites, 71, 77–84. https://doi.org/10.1016/j.cemconcomp.2016.05.010
4. Guo, Y., Chen, X., Chen, B., Wen, R., & Wu, P. (2021). Analysis of foamed concrete pore structure of railway roadbed based on X-ray computed tomography. Construction and Building Materials, 273, 121773. https://doi.org/10.1016/j.conbuildmat.2020.121773
5. Hong, C. W., Jang, H. S., & Jeong, W. K. (2006). Strength and durability properties of concretes using ground granulated blast-furnace slag according to steam curing types. Journal of Korean Institute of Research Recycling, 15, 52–59.
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