Experimental evaluation of fly ash and lime stabilization on the geotechnical characteristics of expansive clay for road subbase applications
Nnadi Ezekiel, Josephine Najjibyo, Deepa Krishnan, Emmanuel Izere · 2026
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Description
Ezekiel and colleagues tested cheap ways to firm up swelling clay soil so it can carry roads without cracking. Their 2026 laboratory study mixed expansive clay with fly ash, lime, and granules from waste tyres. Untreated clay swells when wet and shrinks when dry, which breaks road bases. The team measured density, stiffness, and swelling across several mix ratios to find a sweet spot.
A blend using 5 percent combined lime and fly ash cut the soil plasticity index, a swelling measure, by 86 percent in the reported tests. Bearing strength jumped as well, rising from a weak untreated range to a much stronger treated value. Doubling the additives to 10 percent backfired, giving worse results than the smaller dose. Tyre granules raised water demand and lowered density. Ezekiel recommends the modest blend for road subbase work.
Catalog record
| CREATOR | Nnadi Ezekiel, Josephine Najjibyo, Deepa Krishnan, Emmanuel Izere |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 32 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |