Investigation on the Utilisation of Coffee Husk Ashes to Stabilise Expansive Subgrade Soils for Road Construction in Tanzania

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Laboratory tests revealed that expansive soils can swell up to about 1.66% when untreated, affecting road stability.
Using coffee husk ash at a 20% mixture improved the California bearing ratio to 19.70%, enhancing soil stability.
The coffee husk ash mix reduced plasticity index values, showing potential for better construction material properties.
This approach could provide cost-effective solutions for construction practitioners dealing with expansive soils.

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Laboratory analysis shows that coffee husk ash improves soil properties in expansive soils, indicating its potential for road construction.

Mhando et al. (2025) studied this question.

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Laboratory analysis shows that coffee husk ash improves soil properties in expansive soils, indicating its potential for road construction.