Physico-Mechanical Properties of Geopolymer Concrete made from Metakaolin and Recycled Concrete Aggregate
Authors: Abiodun, Y.O.
DOI Info: http://doi.org/10.5281/zenodo.8095032
ABSTRACT
Due to the negative implications of carbon dioxide emissions from cement manufacture and excessive demands on naturally available resources, the construction industry's developmental contributions to both developing and developed countries have been deemed unsustainable. A circular economy approach, which includes material recycling, reuse, reduction, and repair, is becoming more popular. In this study, metakaolin was synthesized using sodium hydroxide and sodium silicate to create metakaolin-based geopolymer (Mk-Gp). Recycled concrete aggregate (RCA) obtained from crushed concrete cubes was used to replace natural coarse aggregate (granite) at 0, 20, 40, 60, and 80% replacement levels to produce Mk-Gp concrete containing recycled concrete aggregate (Mk-GpRCA) and Ordinary Portland Cement (OPC) concrete containing recycled concrete aggregate (OPC-RCA) which serves as the control. Compressive strength test, splitting tensile strength test and water absorption test were carried out. The results for compressive strength at 28 days of curing revealed that 20% Mk-GpRCA had an increase of 11.85% over 20% OPC-RCA, while 20% Mk-GpRCA had an increase of 12.7% over 20% OPC-RCA in splitting tensile strength. Therefore, this study established that RCA can be used to replace granite in Mk-GpRCA up to 40% replacement level for sustainable construction.
Affiliations: Department of Civil and Environmental Engineering, University of Lagos, Lagos State, Nigeria
Keywords: Carbon Dioxide, Compressive Strength, Metakaolin, Recycled Concrete, Splitting Tensile Strength, Water Absorption
Published date: 2023/06/30
