08.2021.406.416

The effect of substitution of cement by geopolymers on carbonation and mechanical properties of Concrete

Author(s):

Zainab A. Mohammed * , Ismail I. Marhoon

Affiliation(s):

Mustansiriyah University, College of Engineering, Iraq

Corresponding Author Email: ebma006@uomustansiriyah.edu.iq; isibmr@uomustansiriyah.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The use of geopolymers to partially or completely replace ordinary portland cement (OPC) has recently become a significant major research field. Not only for economic reasons but also environmental reasons, because cement is a product that emits a lot of CO2 up into the air during its production that led to contributing to global warming. The alkali-activated binders have been shown in studies to have comparable strengths to ordinary Portland cement (OPC) nonetheless; very few studies have been done on their long-term durability. Therefore, this research looked into the impact of replacing 0%, 20%, 40%, and 60% of the cement mass with fly ash and mix of (fly ash (FA)/ Ground Granulated Blast Furnace Slag (GGBS)) on the carbonation and mechanical properties of concrete. Based on the findings of the experiments, it turns out as the fraction of cement substituted by geopolymers increases, the carbonation depth decreases, while the initial and final setting time increases with the rise in the replacement percentage. As for the compression resistance, it improved initially in the beginning but soon decreases when the percentage of replacement with FA increases, and when mixing FA with GGBS, the compressive strength increases again.