Journal
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
Volume 15, Issue 1, Pages 391-406Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/16583655.2021.1984864
Keywords
Micro steel fibres; geopolymer paste; nano CaCO3; flexural strength; toughness modulus; SEM
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The study investigated the mechanical properties of micro steel fibre-reinforced fly ash-based geopolymer pastes by adding different contents of nano CaCO3. It was found that the utilization of 2% nano CaCO3 in the paste introduced optimum mechanical performance in terms of compressive strength, flexural strength, fracture toughness, elastic modulus, toughness modulus, and hardness.
The present study has investigated the mechanical properties of micro steel fibre-reinforced fly ash-based geopolymer pastes by adding different contents of nano CaCO3. Three contents (0%, 1%, 2%, and 3% by weight of fly ash) were evaluated for nano CaCO3 while the content of micro steel fibres was kept constant at 0.5% by weight of paste. A control mix containing 0.5% micro steel fibres without any content of nano CaCO3 was fabricated for comparison purposes. The evaluated mechanical characteristics of micro steel fibre-reinforced geopolymer pastes were the compressive strength, flexural strength, elastic modulus, Charpy impact strength, hardness, fracture toughness, toughness modulus, bending stress-strain response, bending load-deflection behaviour, compressive stress-strain response and toughness indices. The outcomes of the present study showed that the utilization of 2% nano CaCO3 in micro steel fibre-reinforced GPC introduced the optimum mechanical performance for compressive strength, flexural strength, fracture toughness, elastic modulus, toughness modulus, and hardness. . [GRAPHICS] .
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