Abstract
Laterized concrete is characterised by decreasing compressive strength with increasing content of laterite. Carbonation, on the other hand, is noted to increase concrete strength. In order to reduce carbon dioxide from the atmosphere, this paper investigated the effect of carbonation on the compressive strength development of laterized concrete. The paper compared the compressive strengths of conventional and laterized concrete specimens containing up to 35% content of laterite cured in water for 126 days and in an accelerated carbonation chamber for 12 weeks at the water/cement ratios of 0.35, 0.50 and 0.65. Results revealed that while the addition of laterite reduced compressive strength, carbonation increased the compressive strength development of laterized concrete. Furthermore, while equal strengths with water cured conventional concrete were achieved when laterite content is limited to 10%, all the carbonated laterized concrete specimens achieved higher strengths than the water cured laterized concrete specimens at 12 weeks of accelerated carbonation. Hence, carbonation would enhance the strength development of laterized concrete, permit the use of higher content of laterite and contribute to the reduction of carbon dioxide from the atmosphere. Keywords: carbonation, compressive strength, concrete, laterite, laterized concrete DOI: 10.7176/CER/12-4-04 Publication date: April 30 th 2020
Highlights
IntroductionIn order to reduce pressure on river sand and possibly reduce the cost of concrete, laterized concrete (a concrete in which the sand content has been partially replaced with laterite) has been suggested as an alternative to the conventional concrete (Lasisi & Osunade, 1985; Falade, 1994; Udoeyo et al, 2006; Onipe & Folagbade, 2017; Folagbade & Osadola, 2019)
In order to reduce pressure on river sand and possibly reduce the cost of concrete, laterized concrete has been suggested as an alternative to the conventional concrete (Lasisi & Osunade, 1985; Falade, 1994; Udoeyo et al, 2006; Onipe & Folagbade, 2017; Folagbade & Osadola, 2019)
In order to improve the compressive strength of laterized concrete, encourage the use of higher contents of laterite in concrete and contribute to reducing the level of carbon dioxide in the atmosphere in order to make the environment friendlier, this paper investigated the effect of carbonation on the compressive strength development of laterized concrete
Summary
In order to reduce pressure on river sand and possibly reduce the cost of concrete, laterized concrete (a concrete in which the sand content has been partially replaced with laterite) has been suggested as an alternative to the conventional concrete (Lasisi & Osunade, 1985; Falade, 1994; Udoeyo et al, 2006; Onipe & Folagbade, 2017; Folagbade & Osadola, 2019). The major shortcoming of laterized concrete is that the content of laterite should be limited to a level that would not impair its strength and durability performance. A laterite content of 20-40% have been suggested to ensure that laterized concrete would have good strength and durability performance (Onipe & Folagbade, 2017; Folagbade & Osadola, 2019). The increasing level of industrialisation have created imbalance in the atmospheric level of carbon dioxide (the most dangerous of the greenhouse gases) resulting in health problems (respiratory diseases arising from air pollution) and environmental problems such as change in weather pattern (climate change) resulting in global warming, thermal discomfort, extinction problem, melting of ice, rising sea level and flooding. According to the report of the Intergovernmental Panel on Climate Change, every sector of the global economy has contributed to the emissions and everyone is expected to devise means of preventing its devastation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
