Email this article Investigation on mechanical properties and microstructural characteristic of rice hush ash based geopolymer mortar as patch repair
Abstract
The rapid expansion of the construction sector is increasing cement use, which significantly impacts the environment due to CO2 emissions. Geopolymers are eco-friendly construction materials designed to reduce cement use and potential to be the patching material to rehabilitate the concrete structure. Among these, pozzolanic materials like rice husk ash, rich in aluminosilicate, are abundant and suitable for geopolymer binders. This study explores using rice husk ash and alkali activators (NaOH/Na2SiO3) with different activator percentages (40%, 45%, and 50%) to evaluate their mechanical properties and potential applications as patch repair materials. The research involved formulating an optimal mix design through trial and error in a laboratory setting, followed by curing at 70°C and testing at room temperature. XRF and SEM-EXD analyses were performed to determine the chemical composition and microstructure of the specimens. The activators, NaOH and Na2SiO3, were used in a 1:3.5 ratio with 14M molarity and 2% superplasticizer to enhance workability. Results showed that the geopolymer mortar's highest compressive strength was 8.14 MPa at a 40% activator variation, while the highest split tensile and flexural strengths were 2.50 MPa and 1.00 MPa, respectively, both at a 50% variation. These findings suggest that the mortar is suitable for patch repairs on concrete substrates with compressive strengths below 8 MPa. The mechanical properties of the rice husk ash geopolymer mortar are influenced by the silica, calcium, and alkali activator content, which affect the mortar's strength and density.
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References
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