Effect of Recycled Coarse Aggregate on Mechanical Properties and Durability of Steam-cured Concrete

DOI

10.2991/978-94-6463-449-5_24How to use a DOI?

Keywords

Construction material; Steam-cured concrete; Recycled coarse aggregate; Compressive strength; Durability analysis; Permeability

Abstract

In order to promote the application of recycled coarse aggregate in steamed concrete, and to achieve a broader coverage of recycled coarse aggregate in the construction industry, thus effectively reduce the shortage of natural aggregate resources. The study investigated effects of different replacement rates of recycled coarse aggregate on the strength, capillary water absorption, gas permeability and chloride ion permeability of steam-cured concrete, and the microstructure of steam-cured concrete was observed by means of electron microscopy (SEM). The results show that the compressive strength of steam-cured concrete with replacement rates of 25%, 50%, 75% and 100% recycled coarse aggregate decreases by 7.79%, 12.77%, 16.23% and 22.94% at 1 day age, and by 5.28%, 11.24%, 16.18% and 22.27% at 28 days age, respectively; the gas permeability coefficients increase by 0.65, 1.23, 1.77 and 2.59 times, respectively; the chloride ion diffusion coefficients increase by 14.41%, 35.05%, 47.51% and 63.08%, respectively; there is an obvious interface transition zone between natural coarse aggregate and gel phase, and the interface bond of recycled coarse aggregate and gel phase in steam-cured concrete with 50% replacement rate is tightly bonded, and no obvious interface division is seen.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Shaoying Ning
AU  - Shuai Shen
AU  - Baoju Liu
PY  - 2024
DA  - 2024/06/30
TI  - Effect of Recycled Coarse Aggregate on Mechanical Properties and Durability of Steam-cured Concrete
BT  - Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)
PB  - Atlantis Press
SP  - 241
EP  - 252
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-449-5_24
DO  - 10.2991/978-94-6463-449-5_24
ID  - Ning2024
ER  -