Effect of multiple precursors on the properties of ambient-cured geopolymer concrete in harsh environments: evaluating durability and microstructural changes
摘要
Geopolymer concrete (GPC) is a viable and sustainable alternative source to conventional cement concrete. In this research work, long term durability studies for M30, M50 and M70 concrete were studied. From the test results, it was found that in M30 grade concrete, strength and weight decreases to 14.59% and 2.46% with increase in curing days for acid attack, strength decreases after 90 days to 13.5%, and weight increases with increase in curing days to 1.02% for sulphate attack, strength decreases after 56 days to 21.93%, and weight decreases after 90 days to 0.16% for chloride attack. In M50 grade concrete, strength and weight decreases to 8.23% and 1.58% with increase in curing days for acid attack, strength decreases after 90 days to 12.15% and weight decreases to 0.19% after 90 days for sulphate attack, strength decreases after 90 days to 14.49%, and weight decreases after 90 days to 0.08% for chloride attack. In M70 grade concrete, strength and weight decreases to 4.53% and 1.33% with increase in curing days for acid attack, strength decreases to 13.16% after 90 days and weight decreases after 56 days to 0.15% for sulphate attack, strength decreases after 90 days to 17.99%, and weight decreases after 180 days to 0.13%. In salt ponding test, chloride concentration decreases with an increase in depth and in sorptivity test, sorptivity value decreases with increase in curing days. Additionally, Embodied energy (EE) and Embodied CO2 emission (ECO2) of construction materials were examined to evaluate the sustainability of concrete.
Graphical Abstract