Design and Application Research of Recycling Solutions for Aged Asphalt Mixture Aggregates

DOI

10.2991/978-94-6463-856-1_40How to use a DOI?

Keywords

RAP fine aggregate; cement; epoxy resin; aggregate strengthener; pelletizing process; fine concrete

Abstract

To address the issue of low utilization rate of a substantial amount of fine aggregate (particle size <5mm) in recycled asphalt pavement (RAP), a method is proposed to agglomerate RAP fine aggregate into recycled coarse aggregate (particle size range 5mm~15mm). Cement (20%, 30%, 40%) is used as the main binder, supplemented with epoxy resin (3%, 5%, 7%), and RAP recycled aggregate is prepared through a pelletizing process. The aggregate is chemically impregnated and strengthened using water glass (WG) and tetraethyl orthosilicate (TEOS) solution. The optimal preparation process parameters for the recycled aggregate are determined through setting up orthogonal experiments; the obtained RAP recycled aggregate is used to replace natural coarse aggregate at different proportions (0%, 20%, 30%, 40%, 50%) to prepare fine concrete with a compressive strength grade of C30. The results indicate that with the increase of RAP recycled aggregate content, the concrete’s slump, compressive strength, flexural strength, and frost resistance all show a declining trend. Taking everything into consideration, when the content of RAP recycled aggregate is 30%-40%, the loss of concrete performance is relatively controllable, possessing certain engineering application potential. This study provides a new technical approach for the high-value utilization of RAP fine aggregate, which has positive significance for promoting the resource utilization of construction waste and green infrastructure development.

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  - Fuzhou Shi
AU  - Chu Huang
AU  - Kaicheng Zhang
AU  - Ze Tao
PY  - 2025
DA  - 2025/09/22
TI  - Design and Application Research of Recycling Solutions for Aged Asphalt Mixture Aggregates
BT  - Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
PB  - Atlantis Press
SP  - 419
EP  - 432
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-856-1_40
DO  - 10.2991/978-94-6463-856-1_40
ID  - Shi2025
ER  -