Mechanical properties and environmental assessment of low carbon concrete containing limestone powder and high-volume fly ash Steve Supit (1a), Dwars Soukotta (2b), Artian Sirun (3c), Priyono (4d), Sintia Korompis (5e), Rudolf Mait (6f)
1,2,3,4,5,6 Manado State Polytechnic, Jl. Raya Politeknik Kel. Buha, Manado 95252, Indonesia
a) Corresponding author: steve.supit[at]sipil.polimdo.ac.id
b) dwarssoukotta[at]gmail.com c) sirunartian[at]yahoo.co.id d) priyonosst[at]gmail.com e) sintiapolimdo[at]gmail.com
f) rudolf.mait[at]polimdo.ac.id
Abstract
This paper reports the experimental evaluation on mortar containing limestone and high-volume fly ash as a replacement of cement to produce a low-carbon concrete for green infrastructure. In this experiment, mortar containing different percentages of limestone was tested to gain the mixture that exhibited highest influence based on the 7th day of compressive strength. The results gained from the tested mortar were then used to evaluate the compressive strength, tensile strength, and water sorptivity of concrete. The estimation of the carbon emission produced by different types of mixture proportions was also presented in this study. Based on the results, the improvement of compressive strength can be expected when replacing cement with limestone powder with the maximum percentage used was found in a mixture with 15% replacement of cement. When adding the 15% limestone in high-volume fly ash i.e., 40%, 50%, and 60%, the strength was found to be lower. However, the results on water sorptivity showed that using limestone combined with 40% fly ash can produce a comparable result with the normal concrete. The environmental assessment shows the potential of reducing CO2 emissions by replacing cement at the high-volume fly ash with the percentage of 40%. The research outcomes would be more on the potential contribution to produce environmentally friendly concrete to support the zero emissions goal in the construction field.
