Serigne Diop1, Oustasse Abdoulaye Sall2, Déthié Sarr3, and Makhaly Ba4
1 Department of Civil Engineering, UFR SI-University Iba Der Thiam de Thies, Thies, Senegal
2 Department of Civil Engineering, UFR SI, Université Iba Der THIAM, Thiès, Senegal
3 Geotechnics Department, UFR SI, Université Iba Der THIAM, Thiès, Senegal
4 Department of Geotechnics, UFR SI- Université Iba Der Thiam de Thies, Thies, Senegal
Original language: English
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Abstract
The aim of this project is to reclaim fly ash from the Bargny coal-fired power plant for use in the production of hydraulic concrete, and also to provide economic and environmental solutions for the storage of industrial waste. To achieve this, the materials used were first characterized, in particular cement, fly ash and aggregates (sand, basalt, flint and limestone), in order to determine their physical and physico-chemical characteristics. Next, a campaign to formulate hydraulic concretes and manufacture 16x32cm cylindrical test bodies was carried out, in which cement was substituted by fly ash at different contents (0%, 5%, 10% and 20%). After conditioning in water, the specimens were progressively crushed at 7, 14 and 28 days of curing. The results showed an increase in compressive strength with increasing curing time for a given substitution rate. However, a decrease in compressive strength was observed for all formulated concretes as the fly ash content increased. On the other hand, the strengths obtained with basalt are higher than the target strength at 28 days (25 MPa), even up to 20% cement substitution.
Author Keywords: Strength, Fly ash, Coal-fired power plant, Hydraulic concrete, Formulation.
