Accelerated carbonation of biochar reinforced cement-fly ash composites: Enhancing and sequestering CO2 in building materials

Praneeth, Sai; Guo, Ruonan; Wang, Tao; Dubey, Brajesh; Sarmah, Ajit K.

doi:10.1016/j.conbuildmat.2020.118363

Cited by 108 publications

(18 citation statements)

References 52 publications

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“…3d ). 43 A valve with a digital pressure gage was connected to the reactor to control the gas pressure. Three CO 2 gas pressures, 0.1 bar (0.01 MPa), 1 bar (0.1 MPa), and 2 bar (0.2 MPa), were selected to study the effect of CO 2 pressure on the crystallization of CaCO 3 during CO 2 pretreatment.…”

Section: Experimental Programmentioning

confidence: 99%

“…To facilitate the entry of CO 2 into cement matrix, removal of pore water is recommended. [43][44][45][46] Here, a drying scheme of 40 C for 2 h was used to partially remove the capillary water in the AC specimens before being exposed to CO 2 gas (Fig. 3c).…”

Section: Carbonationmentioning

confidence: 99%

“…3c). [43][44][45][46] This allows for a 7-10% reduction in mass of the AC specimens. The partially dried AC specimens were then moved to a homemade CO 2 curing reactor for carbonation (Fig.…”

Section: Carbonationmentioning

confidence: 99%

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Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Ruan

Liu

et al. 2022

RSC Adv.

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Section: Experimental Programmentioning

confidence: 99%

Section: Carbonationmentioning

confidence: 99%

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Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Ruan

Liu

et al. 2022

RSC Adv.

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“…While water, as a reactant, is essential for carbonation, excessive water would depress the reaction of CO 2 with cement-based materials. − Therefore, a pre-drying scheme (60 ± 2 °C for 10 h) was performed to all the cubic AC blocks (Figure c). After these blocks were naturally cooled to room temperature, the mass before carbonation was measured ( m 1 ).…”

Section: Experimental Programmentioning

confidence: 99%

“…After these blocks were naturally cooled to room temperature, the mass before carbonation was measured ( m 1 ). A homemade CO 2 curing reactor was employed for CO 2 curing (Figure d–f). A CO 2 cylinder was connected to the reactor with a valve and barometer to control the CO 2 gas pressure (Figure d).…”

Section: Experimental Programmentioning

confidence: 99%

CO₂ Pretreatment to Aerated Concrete with High-Volume Industry Wastes Enables a Sustainable Precast Concrete Industry

Yan

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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Carbon dioxide (CO 2 ) pretreatment to concrete at the early curing ages is a feasible technique towards achieving a greener and more sustainable concrete industry. However, the carbonation efficiency of ordinary concrete blocks is greatly limited due to their dense compactness. Here we proposed that the aeration of concrete blended with high-volume industry wastes may bring about improved sustainability of the precast concrete industry by enhancing the carbonation efficiency. We designed two different CO 2 pretreatment courses: that is, the gas pressure of CO 2 = 0.1 atm (0.01 MPa) for 8 h and 1 atm (0.1 MPa) for 4 h. The strength and microstructure of the aerated concrete with and without the CO 2 pretreatments were investigated by macro-and microscopic tests. Results showed that the CO 2 pretreatments greatly altered the minerals and pore structure of the aerated concrete blocks. The higher CO 2 pressure with less curing time raised the carbonation extent, crystal size, and compressive strength at 3 days. Compared with ordinary solid concrete, the aerated concrete showed a higher CO 2 sinking efficiency by more than one order of magnitude. This technique would potentially sink millions of tons of CO 2 from the precast aerated concrete industry.

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Enhancement of impact resistance of alkali‐activated slag concrete through biochar supplementation

Egodagamage,

Yapa,

Buddika

et al. 2024

Structural Concrete

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Biochar is a well‐known sustainable and effective additive used in mortar/concrete to improve its mechanical properties. However, its potential to improve the impact resistance of concrete is still unexplored. This paper investigates biochar's effectiveness in improving the strength and impact performance of alkali‐activated slag concrete (AASC). Five AASC samples with 0%, 2%, 4%, 6%, and 8% rice husk biochar (RB) were employed in an experimental program. The strength and the impact resistance were tested, and the latter was assessed over a drop‐weight test conforming to the ACI Committee 544 guidelines. The crack propagation of the impact‐tested samples was examined using micro‐CT images. The results showed that adding RB up to 6% improved, notably the 28‐day compressive strength of AASC. At 6% RB, the strength enhancement was 44.6%, whereas no additional gain was observed at the 8% RB blend. More importantly, except for the 8% RB sample, the impact resistance was considerably augmented with the RB level increment. The increment in the impact number at the first crack and the failure in the 6% RB sample were as high as 185% and 180%, respectively. The reduction in the solution/binder ratio of the mix with the addition of biochar and the internal curing effect of biochar were deemed to be responsible for these improvements. However, possibly due to biochar's brittle characteristics, the increase in RB dosage from 6% to 8% reduced the impact resistance drastically.

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Accelerated carbonation of biochar reinforced cement-fly ash composites: Enhancing and sequestering CO2 in building materials

Cited by 108 publications

References 52 publications

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

CO₂ Pretreatment to Aerated Concrete with High-Volume Industry Wastes Enables a Sustainable Precast Concrete Industry

Enhancement of impact resistance of alkali‐activated slag concrete through biochar supplementation

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Accelerated carbonation of biochar reinforced cement-fly ash composites: Enhancing and sequestering CO2 in building materials

Cited by 108 publications

References 52 publications

Morphological characteristics of calcium carbonate crystallization in CO2 pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO2 pre-cured aerated concrete

CO2 Pretreatment to Aerated Concrete with High-Volume Industry Wastes Enables a Sustainable Precast Concrete Industry

Enhancement of impact resistance of alkali‐activated slag concrete through biochar supplementation

Contact Info

Product

Resources

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Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

CO₂ Pretreatment to Aerated Concrete with High-Volume Industry Wastes Enables a Sustainable Precast Concrete Industry