Effect of Adding Nano Starch Biopolymer on some Properties of Silica Fume Concrete

Abstract:

The article describes a new method to use biopolymers (Nano starch) as an alternative to mineral admixtures in improving concrete properties, producing sustainable concrete, and reducing CO₂ emissions in the atmosphere by partial replacement of cement with silica fume. The impact of nano starch as a biopolymer on certain properties of silica fume concrete In the fresh state (slump and fresh density) and In the hardened state (compressive strength, splitting tensile strength) at 7 and 28 days was researched. It has been added to silica fume concrete in various percentages of (0.5%, 1%, and 1.5%) by the weight of cement. The mix proportions were (1:2.3:2.3) (cement: sand: gravel) respectively, for all blends w/c equal 0.47, and constant percentage of ( silica fume of 15%, and superplasticizer of 0.75 percent) by the weight of cement. According to the findings, the optimal starch addition was 0.5%, which resulted in a 34% increase in compressive strength and a 31% and 21% increase in splitting tensile and flexural strength of concrete, respectively. Slump increased by 19%, and fresh density increased by 4% when the starch powder was added at a concentration of 1.5%.

• Periodical: Key Engineering Materials (Volume 911)
• Pages: 145-150
• DOI: https://doi.org/10.4028/p-2i42va
• Online since: February 2022
• Authors: Samir M. Atia*, Waleed A. Abbas
• Keywords: Biopolymer Admixtures, Biopolymer Concrete, Nano Starch, Silica Fume Concrete, Stength

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