Study on the Effect of Steel Slag Fine Aggregate on the Road Performance of Cement Stabilised Sandstone Subgrade

DOI

10.2991/978-94-6463-514-0_61How to use a DOI?

Keywords

road engineering; steel slag; sandstone; pavement base; shrinkage properties; water stability

Abstract

The application of steel slag in pavement subgrade can not only improve the comprehensive utilization of steel slag, but also help to reduce the consumption of natural sand and gravel materials. In order to analyze the influence of steel slag fine aggregate on the road performance of cement-stabilized sandstone base layer (CSSB), this paper compares and analyzes the compressive strength, splitting strength and shrinkage of CSSB under different conditions of replacing limestone fine aggregate with steel slag fine aggregate, and uses SEM combined with energy spectroscopy to reveal the influence of steel slag fine aggregate on the microstructure of CSSB. The results show that: steel slag fine aggregate can effectively improve the late strength of CSSB, in which the 60 d strength of CSSB with 100% (mass fraction) steel slag fine aggregate replacement rate increased by 18.7% compared with the undoped steel slag samples, but there is a certain negative effect on the early strength of CSSB; steel slag fine aggregate can improve the shrinkage performance of CSSB, and the higher the doping, the more obvious the improved performance; although steel slag fine aggregate can improve the shrinkage performance, the higher the doping, the more obvious the improved performance. Compared with the unadulterated steel slag samples, at the age of 28 d, the m(Ca)/m(Si) mass ratio of CSSB interfacial transition zone was reduced by 62.95% at 100% steel slag fine aggregate replacement rate, and the C-S-H gel increased significantly, and the structure was denser. The study shows that steel slag fine aggregate can be used as a substitute for traditional sand and gravel fine aggregate by controlling the reasonable dosage, and has good application prospects in pavement subgrade.

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  - Liu Yang
AU  - Changxi Tang
PY  - 2024
DA  - 2024/09/28
TI  - Study on the Effect of Steel Slag Fine Aggregate on the Road Performance of Cement Stabilised Sandstone Subgrade
BT  - Proceedings of the 2024 7th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA 2024)
PB  - Atlantis Press
SP  - 635
EP  - 643
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-514-0_61
DO  - 10.2991/978-94-6463-514-0_61
ID  - Yang2024
ER  -