Evaluation of Volcanic Ash in Concrete Mixes for Sustainable Bridge Construction
Volume Title: ICASGE2025
Paper ID : 1114-ICASGE-FULL (R1)
Authors
Central Connecticut State University
Abstract
This study investigates the improvement of strength and durability in concrete mixtures by incorporating volcanic ash as an admixture. Concrete used in bridge construction often degrades over time, allowing water to penetrate and carry chlorides and other harmful substances that accelerate deterioration. To combat this, alternative green construction materials are being explored to extend the lifespan of these structures without significantly increasing maintenance costs. This research compares the effects of volcanic ash and traditional fly ash admixtures on concrete’s strength and durability. The findings show that volcanic ash can significantly enhance early strength, with mixes containing 20% volcanic ash exhibiting higher initial stress values compared to those with fly ash. Both volcanic ash and fly ash mixes achieve similar long-term strength, though volcanic ash mixes tend to perform slightly better. High proportions of volcanic ash (50% or more) result in lower strength, indicating that optimal replacement levels (around 20-25%) provide a good balance between early and long-term strength. These results 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.
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