Analysis of Mechanical Properties and Sulfate Resistance of Concrete with the Addition of Sawdust Ash as a Filler

Fairuza Putri Rahmah Salsabila, Agil Fitri Handayani, Syahidah Fani Nastiti, Dwi Siswahyudi

Abstract


The use of wood as fuel in Indonesia remains high in both household and industrial activities. However, the ash produced from wood combustion is often discarded and allowed to accumulate, causing pollution and disturbing human respiratory health. Sawdust ash contains very fine particles and exhibits pozzolanic characteristics, making it a potential alternative filler material in concrete. This study investigated the effect of sawdust ash addition on the mechanical properties and sulfate resistance of concrete. Sawdust ash was added at proportions of 0%, 5%, 10%, and 15% of the total cement weight. The mechanical properties of concrete were evaluated through compressive strength and modulus of elasticity tests at 28 days. Durability performance against sulfate attack was assessed by immersing the specimens in a magnesium sulfate solution and testing them at 56 and 84 days. The results showed that the addition of 5% and 10% sawdust ash improved the compressive strength and modulus of elasticity, while the 15% variation reduced both properties. The optimum percentage of sawdust ash was 5%, increasing compressive strength by 23,85% and modulus of elasticity by 24,49%. However, the incorporation of sawdust ash reduced the concrete resistance to sulfate attack under prolonged immersion in magnesium sulfate solution.

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References


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