This research project evaluates the enhancement of strength and durability properties in concrete mixtures through the incorporation of volcanic ash as an admixture. Concrete used in bridge construction is prone to degradation over time, allowing water to permeate and carry chlorides and other harmful substances that accelerate deterioration. To address this, alternative green construction materials are being explored to extend the lifespan of these structures without significantly increasing maintenance costs. This study compares the effects of volcanic ash and the traditional fly ash admixture on concrete’s strength and durability. The results indicate that volcanic ash can significantly improve early strength, with mixes containing 20% volcanic ash showing higher initial stress values compared to those with fly ash. Both volcanic ash and fly ash mixes achieve comparable long-term strength, but volcanic ash mixes tend to perform slightly better. High proportions of volcanic ash (50% or more) result in lower strength, suggesting that optimal replacement levels (around 20-25%) provide a good balance between early and long-term strength. These findings support the use of volcanic ash as a sustainable and effective alternative to fly ash in concrete production, contributing to more durable and environmentally friendly bridge construction.

Concrete, admixture, volcanic ash, fly-ash

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