Improvement of subgrade California Bearing Ratio (CBR) using recycled concrete aggregate and fly ash
Document Type
Article
Publication Date
4-2024
Abstract
The study aims to understand the effect of different admixtures on improving the quality of flexible pavement subgrades. In this paper, recycled concrete aggregates (RCA) and Fly Ash were used as the admixtures in improving the maximum dry density (MDD), swelling potential, and California bearing ratio (CBR) of subgrade soil. The percentages of RCA and fly Ash used were 5%, 10%, and 15%. With the upscaling in fly ash dosage, the optimum moisture content and the California bearing ratio increased. However, the MDD of soil decreased for higher fly ash contents. On the contrary, the optimum moisture content (OMC) of the soil decreased and the MDD and California Bearing Ratio increased with an increase in RCA content. Both RCA and fly ash-treated soil demonstrated lower values of swelling. At 5% dosage, both RCA and fly ash admixtures were found to improve CBR. However, at higher percentages (10% and 15%) of fly ash, the CBR values decreased while in comparison, soil samples performed significantly better in the CBR test with the increasing dosage of RCA. The findings of this research can be used to examine the suitability and effects of recycled aggregate and fly ash on the performance of soil in terms of CBR, particularly when the soil is planned to be used as a subgrade in highways.
Recommended Citation
Ahmed, Safkat Tajwar, Mozaher Ul Kabir, Chowdhury Zubayer Bin Zahid, Tahsin Tareque, and Seyedali Mirmotalebi. "Improvement of subgrade California Bearing Ratio (CBR) using recycled concrete aggregate and fly ash." Hybrid Advances (2024): 100153. https://doi.org/10.1016/j.hybadv.2024.100153
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Publication Title
Hybrid Advances
DOI
10.1016/j.hybadv.2024.100153
Comments
Under a Creative Commons license http://creativecommons.org/licenses/by/4.0/