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A platform for research: civil engineering, architecture and urbanism
Sulfuric acid attack neutralizing through carbonation curing of hydrated lime-modified concretes
https://orcid.org/0009-0009-2845-3726
https://orcid.org/0000-0002-7521-5079
Abstract Sulfuric acid in sewage systems causes great damage to concrete elements every year. Also, the excessive release of carbon dioxide develops global warming and climate change. A lot of studies have been separately carried out to solve mentioned problems and some solutions have been provided. But, research that simultaneously mitigates the harmful effects of both problems has rarely been conducted. Therefore, sulfuric acid resistance of carbonated concretes with replacement levels of 10 %, 20 %, and 30 % of hydrated lime was investigated in this study. 28 days of moist curing and up to 24 h of CO2 curing were considered for the specimens. Then the samples were immersed in sulfuric acid solution (pH=0.6) up to 90 days. Parameters such as compressive strength, water absorption, and CO2 absorption of concrete samples were measured before immersion in sulfuric acid solution. Also, compressive strength loss, mass reduction, 3D scanning, and FT-IR analysis of concrete samples after immersion in sulfuric acid solution were performed. The results showed that the CO2 curing method can increase the durability of concrete mixtures in the sulfuric acid environment. It was also observed that replacing hydrated lime with cement increases the durability of concrete mixtures against sulfuric acid attacks in both moist and CO2 curing methods. In general, replacing hydrated lime up to 30 % of cement increased CO2 absorption up to 36 % and increased sulfuric acid resistance up to 38 % in terms of mass loss.
Highlights CO2 uptake of the mixtures increased with increasing the hydrated lime replacement. CO2 curing of concretes increases the durability under sulfuric acid attack. CO2 curing period has no significant effect on the durability against sulfuric acid. Hydrated lime replacement increased the durability of concretes against sulfuric acid.
Sulfuric acid attack neutralizing through carbonation curing of hydrated lime-modified concretes
https://orcid.org/0009-0009-2845-3726
https://orcid.org/0000-0002-7521-5079
Abstract Sulfuric acid in sewage systems causes great damage to concrete elements every year. Also, the excessive release of carbon dioxide develops global warming and climate change. A lot of studies have been separately carried out to solve mentioned problems and some solutions have been provided. But, research that simultaneously mitigates the harmful effects of both problems has rarely been conducted. Therefore, sulfuric acid resistance of carbonated concretes with replacement levels of 10 %, 20 %, and 30 % of hydrated lime was investigated in this study. 28 days of moist curing and up to 24 h of CO2 curing were considered for the specimens. Then the samples were immersed in sulfuric acid solution (pH=0.6) up to 90 days. Parameters such as compressive strength, water absorption, and CO2 absorption of concrete samples were measured before immersion in sulfuric acid solution. Also, compressive strength loss, mass reduction, 3D scanning, and FT-IR analysis of concrete samples after immersion in sulfuric acid solution were performed. The results showed that the CO2 curing method can increase the durability of concrete mixtures in the sulfuric acid environment. It was also observed that replacing hydrated lime with cement increases the durability of concrete mixtures against sulfuric acid attacks in both moist and CO2 curing methods. In general, replacing hydrated lime up to 30 % of cement increased CO2 absorption up to 36 % and increased sulfuric acid resistance up to 38 % in terms of mass loss.
Highlights CO2 uptake of the mixtures increased with increasing the hydrated lime replacement. CO2 curing of concretes increases the durability under sulfuric acid attack. CO2 curing period has no significant effect on the durability against sulfuric acid. Hydrated lime replacement increased the durability of concretes against sulfuric acid.
Sulfuric acid attack neutralizing through carbonation curing of hydrated lime-modified concretes
https://orcid.org/0009-0009-2845-3726
https://orcid.org/0000-0002-7521-5079
Abstract Sulfuric acid in sewage systems causes great damage to concrete elements every year. Also, the excessive release of carbon dioxide develops global warming and climate change. A lot of studies have been separately carried out to solve mentioned problems and some solutions have been provided. But, research that simultaneously mitigates the harmful effects of both problems has rarely been conducted. Therefore, sulfuric acid resistance of carbonated concretes with replacement levels of 10 %, 20 %, and 30 % of hydrated lime was investigated in this study. 28 days of moist curing and up to 24 h of CO2 curing were considered for the specimens. Then the samples were immersed in sulfuric acid solution (pH=0.6) up to 90 days. Parameters such as compressive strength, water absorption, and CO2 absorption of concrete samples were measured before immersion in sulfuric acid solution. Also, compressive strength loss, mass reduction, 3D scanning, and FT-IR analysis of concrete samples after immersion in sulfuric acid solution were performed. The results showed that the CO2 curing method can increase the durability of concrete mixtures in the sulfuric acid environment. It was also observed that replacing hydrated lime with cement increases the durability of concrete mixtures against sulfuric acid attacks in both moist and CO2 curing methods. In general, replacing hydrated lime up to 30 % of cement increased CO2 absorption up to 36 % and increased sulfuric acid resistance up to 38 % in terms of mass loss.
Highlights CO2 uptake of the mixtures increased with increasing the hydrated lime replacement. CO2 curing of concretes increases the durability under sulfuric acid attack. CO2 curing period has no significant effect on the durability against sulfuric acid. Hydrated lime replacement increased the durability of concretes against sulfuric acid.
Sulfuric acid attack neutralizing through carbonation curing of hydrated lime-modified concretes
Ezzati, Hamid Reza (author) / Rahmani, Hamid (author)
2024-01-19
Article (Journal)
Electronic Resource
English
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