| Autor: |
Shrirao, Shubham Prakash, Bhosale, Sukhanand Sopan, Patil, Kailas Arjun |
| Zdroj: |
International Journal of Pavement Research and Technology; 20240101, Issue: Preprints p1-13, 13p |
| Abstrakt: |
Pavements constructed on expansive soil subgrades are often subjected to distress due to the volume change behaviour of the expansive soil. This study investigated the use of high-density polyethylene (HDPE) fibres to reinforce expansive soil subgrades and improve the performance of pavements constructed on them. The study first optimized the fibre content and length based on soaked California bearing ratio (CBR) tests. The optimal combination of 0.3% fibre content and 140 mm fibre length yielded the highest soaked CBR value of 2.61%. Full-scale laboratory accelerated pavement tests were then conducted on water-bound macadam (WBM) pavement models constructed using unreinforced and fibre-reinforced expansive soil subgrades. The results of the tests showed that the WBM pavement model with fibre-reinforced subgrade (WBM_FRS) exhibited reduced permanent settlement, enhanced resilience and a traffic benefit ratio of 5.33 compared to the WBM pavement model with an unreinforced subgrade (WBM_URS). The extent of heave observed in the WBM_FRS pavement model was also lower than that in the WBM_URS model, thereby mitigating differential settlement. The test results were then used to perform pavement design to quantify the base course thickness reduction with fibre-reinforced subgrade. The results showed that the base course thickness could be reduced by up to 23% with fibre-reinforced subgrade. Future research can focus on inclusion of higher number of loading cycles along with additional investigations such as life cycle assessment along with economic implications of using HDPE fibres for soil subgrade reinforcement. |
| Databáze: |
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