Study of Compressive Strength and Flexural Strength of HVFA SCC as Sustainable Concrete for Rigid Pavement

Abstract

High Volume Fly Ash–Self Compacting Concrete (HVFA-SCC) is a sustainable concrete innovation that utilizes large amounts of fly ash as a partial replacement for cement, thereby reducing carbon emissions and industrial waste. High Volume Fly Ash Self Compacting Concrete (HVFA-SCC) has a fly ash content of more than 50%. The purpose of this study was to determine the compressive strength and flexural strength of HVFA-SCC concrete that will be used for making Rigid Pavement. This study used experimental methods in the laboratory including testing the properties of fresh concrete and mechanical properties of hardened concrete compressive strength and flexural strenght. Concrete testing was carried out at the ages of 28, 56, and 90 days. The results showed that the compressive strength increased from 32.5 MPa at 28 days to 38.8 MPa at 90 days, while the flexural strength increased from 4.56 MPa to 4.68 MPa. The most significant increase in strength occurred between 28 and 56 days, then tended to slow down until 90 days, indicating increasingly stable hydration and microstructural development. Compressive strength can be used as a representative parameter for estimating the flexural strength of HVFA SCC. HVFA SCC has good potential for use in rigid pavement construction, because it is able to meet the need for structural strength while providing a more environmentally friendly material alternative through the use of high amounts of fly ash. The flexural strength of HVFA SCC based on Pd T-14-2003 and ASTM C-78 is included in the minimum flexural strength requirements for Rigid Pavement with a value criterion of 3-5 MPa.