Carbon sequestration in engineered lightweight foamed mortar – Effect on rheology, mechanical and durability properties

Gupta, Souradeep; Kashani, Alireza; Mahmood, Aziz Hasan

doi:10.1016/j.conbuildmat.2022.126383

Cited by 24 publications

(4 citation statements)

References 72 publications

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“…Wood waste generated Biochar can be used to prepare foamed mortar of densities 1300 kg/m 3 and 1400 kg/m 3 , decreases the porosity of 2% to 3%, and increases the compressive strength between 17 to 23% concerning control mortars for 28 days of curing. Hydration is affected by the longer duration of carbonation after water curing [10]. Sustainability ensures the safety of the earth and human activity.…”

Section: Figure 2 Biochar Production and Applicationsmentioning

confidence: 99%

Sustainable Concrete Pavements: A Comparative Analysis of Biochar-Supplemented and Conventional Concrete in terms of Strength, Carbon Emissions, and Cost

Vijaya Gowri,

Siva Rama Krishna,

Baswaraj

et al. 2024

J. Phys.: Conf. Ser.

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The pavement engineering communities worldwide have deep concerns about the concept of sustainability. The cement concrete pavements can be constructed by replacing supplementary contentious materials (SCM). Biochar is a carbon-rich green material, a fine-grained residue obtained from the thermos-chemical conversion of waste biomass through pyrolysis or gasification. In this project, Biochar was used as a supplementary cementitious material with different percentages of 0% to 20% in preparation of concrete mixes for concrete pavements. Tests for mechanical properties such as compressive strengths of conventional concrete (CC) and Biochar Concrete (BC) were conducted and compared for 7, 14 and 28 days. The results showed that compressive strength of biochar concrete with 20% of biochar is exhibiting higher values than CC and other mixes of Biochar. In addition, BC, with 20% biochar, has reduced life cycle cost and carbon footprint by up to 19% and 17%, respectively, compared with the cement concrete mix without Biochar. So, it is inferred that the optimum replacement of Biochar as an SCM is 20% for cement concrete mix, and it makes concrete pavement sustainable.

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Section: Figure 2 Biochar Production and Applicationsmentioning

confidence: 99%

Sustainable Concrete Pavements: A Comparative Analysis of Biochar-Supplemented and Conventional Concrete in terms of Strength, Carbon Emissions, and Cost

Vijaya Gowri,

Siva Rama Krishna,

Baswaraj

et al. 2024

J. Phys.: Conf. Ser.

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“…Gupta et al investigated carbon sequestration in foamed mortar by the addition of biochar derived from wood waste through accelerated carbonation with a 2% CO 2 concentration [49]. According to thermogravimetric analysis, the carbon dioxide uptake of foamed mortar with silica fume and fly ash was 30% after 28 days, which is higher than the 3% reported for the control without biochar.…”

Section: Carbon-sequestering Potential Of Biocharmentioning

confidence: 99%

Biochar as Cement Replacement to Enhance Concrete Composite Properties: A Review

et al. 2022

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In recent years, concrete has been accessible and economical in the construction industry, resulting in high demand for its components. Cement is known for its negative impact on the environment, which has led researchers to investigate alternative supplementary materials. Recently, biochar has been proposed as a replacement to cement in small amounts, with an optimum amount of 0.08–5, resulting in increased strength and enhancement of other properties of concrete composites. The biochar production process and its components are more economical and environmentally friendly than that of cement. In this review, we focus on research highlighting the properties of biochar that aid in the enhancement of biochar mortar and concrete composite properties. We explore properties of biochar such as water absorption, as well as compressive, flexural and tensile strength. Progress has been made in research on biochar concrete composites; however, additional investigations are required with respect to its carbon-sequestering abilities and life cycle assessment for its production process.

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“…Since zeolite has pores, CO 2 absorption was confirmed, and CH consumption was detected at the same time. In another case, Gupta et al [ 12 ] investigated carbon sequestration performance using lightweight foamed cement mortar. Gupta et al [ 12 ] added biochar particles as an additional material for the fine aggregate, rather than a replacement material.…”

Section: Introductionmentioning

confidence: 99%

“…In another case, Gupta et al [ 12 ] investigated carbon sequestration performance using lightweight foamed cement mortar. Gupta et al [ 12 ] added biochar particles as an additional material for the fine aggregate, rather than a replacement material. Biochar and the foamed cement matrix include a much higher ratio of pores than ordinary cement mortar, therefore, the CO 2 -passing paths were more abundant inside the hardened cement paste than in the ordinary case.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Carbon Dioxide Sequestration in Cement Composites with a Granulation Technique

Lee,

Kim,

Min

et al. 2023

Materials

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The cement industry emits a significant amount of carbon dioxide (CO2). Therefore, the cement industry should recycle the emitted CO2. However, sequestration by carbonation in cement composites absorbs a very small amount of CO2. Therefore, a direct way of achieving this is to improve the absorption performance of CO2 in cement composites. In this study, to improve absorption, unlike in existing studies, a granulation technique was applied, and the material used was calcium hydroxide (CH). In addition, granulated CH was coated to prevent a reaction during the curing of cement paste. The coated CH granule (CCHG) was applied to 5% of the cement weight as an additive material, and the specimens were cured for 91 days to wait for the coating of CCHG to fully phase-change. The experiment of CO2 absorption showed an unexpected result, where the use of blast furnace slag (BFS) and fly ash (FA) had a negative effect on CO2 sequestration. This was because BFS and FA had a filler effect in the cement matrix, and the filler effect caused the blocking of the path of CO2. In addition, BFS and FA are well-known pozzolanic materials; the pozzolan reaction caused a reduction in the amount of CH because the pozzolan reaction consumed the CH to produce a calcium silicate hydrate. Therefore, the pozzolan reaction also had a negative effect on the CO2 sequestration performance combined with the filler effect. The CO2 sequestration efficiency was decreased between ordinary cement paste and BFS-applied specimens by 45.45%. In addition, compared to cases of ordinary cement paste and FA-applied specimens, the CO2 sequestration performance was decreased by 63.64%. Comprehensively, CO2 sequestration performance depends on the porosity and amount of CH.

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Carbon sequestration in engineered lightweight foamed mortar – Effect on rheology, mechanical and durability properties

Cited by 24 publications

References 72 publications

Sustainable Concrete Pavements: A Comparative Analysis of Biochar-Supplemented and Conventional Concrete in terms of Strength, Carbon Emissions, and Cost

Sustainable Concrete Pavements: A Comparative Analysis of Biochar-Supplemented and Conventional Concrete in terms of Strength, Carbon Emissions, and Cost

Biochar as Cement Replacement to Enhance Concrete Composite Properties: A Review

Performance Assessment of Carbon Dioxide Sequestration in Cement Composites with a Granulation Technique

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