Analysis of Pore Structure and Mechanical Properties of Cement Stable Recycled Aggregate in Large Temperature Difference Area

DOI

10.2991/978-94-6463-793-9_30How to use a DOI?

Keywords

Cement stabilized recycled aggregate; Pore structure; Scanning electron microscope; Nuclear magnetic resonance; Mechanical properties

Abstract

The purpose of this study is to improve the utilization rate of waste concrete, and for the curing environment in large temperature difference areas, the effects of large temperature difference curing and standard curing on the mechanical properties of cement stabilized recycled aggregate (CSRA) are compared. By preparing CSRA with 70% recycled aggregate of waste concrete and different cement dosage (4%, 5%), the effect of pore structure characteristics on the mechanical properties of CSRA was studied. The results show that under the standard curing condition, the compressive strength of CSRA is always higher than that under the large temperature difference curing condition, and the influence of cement content on the strength is relatively stable. The splitting strength increases nonlinearly with the increase of age, but the influence of curing conditions and cement content is small. The microstructure analysis showed that the hydration reaction of CSRA was more sufficient and the porosity was lower under standard curing, while the optimization degree of pore structure was lower under large temperature difference curing. The micro powder in recycled fine aggregate not only plays a role of filling, but also plays a role of bonding. The pore structure analysis shows that the porosity decreases with the increase of cement content under standard curing conditions, while the porosity decreases slightly under large temperature difference curing conditions. With the increase of age, the porosity of all kinds of pores gradually decreased, especially the decrease of transition pore and macropore porosity contributed significantly to the improvement of CSRA strength. This provides direction and theoretical basis for optimizing the performance and maintenance management of cement stabilized recycled aggregates.

Copyright

© 2025 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  - Xuqiu Teng
AU  - Huqiang Ma
PY  - 2025
DA  - 2025/07/28
TI  - Analysis of Pore Structure and Mechanical Properties of Cement Stable Recycled Aggregate in Large Temperature Difference Area
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 327
EP  - 343
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_30
DO  - 10.2991/978-94-6463-793-9_30
ID  - Teng2025
ER  -