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Potential of Limestone Powder in the Production of Self Compacting Concrete

Temple Nwofor, Y.T. Adesanya

Abstract


Self-compacting concrete (SCC) is a cutting-edge building material. It's a smooth, durable concrete that fills the formwork completely. The SCC needs a lot of powder to perform well (mostly cement). However, increasing the cement content is impractical and may result in greater hydration heat and drying shrinkage. This project studies the effect of limestone powder (LSP) on the fresh and hardened appearances of SCC. To evaluate the samples with and without LSP as a partial replacement for cement, a control sample of concrete was generated. There were four mixes created using superplasticizer, sand, coarse aggregate, and water at varied replacement amounts of 0, 10, 20, and 30% from cement weight. The results show that replacing up to 30% of the cement in SCC with limestone powder increases the workability of fresh concrete. Conversely, compressive strength increases from 30.35 N/mm2 to 33.73 N/mm2 and 36.26 N/mm2 as the proportion of limestone powder grows from 0% to 10% and 20%, but drops from 36.26 N/mm2 to 21.27 N/mm2 as the percentage of limestone powder increases from 0% to 10% and 20%, respectively (20 percent to 30 percent). Calculated water absorption data show that 10% to 20% replacement reduced average water absorption from 9.54 to 8.87 percent, while 30% replacement reduced average water absorption from 9.54 to 8.87 percent. The water absorption % increased from 8.87 to 9.46. These studies suggest that up to 20% of the cement in SCC can be replaced with limestone powder.

 

Keywords: Limestone, self compacting, concrete, building material, formwork


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References


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