Biochar as internal curing material to prepare foamed concrete

Song, Ning; Li, Zhihe; Wang, Shaoqing; Guo, Li

doi:10.1016/j.conbuildmat.2023.131030

Cited by 11 publications

(1 citation statement)

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“…Several aspects need to be addressed in future research: (1) details on biochar production conditions and biochar properties, including pyrolysis conditions, proximate analysis, element contents, and physicochemical properties need to be provided for further relationship and mechanism analysis and modelling (Song et al 2023 ; Zhu et al 2023 ); (2) the potential application of engineered or modified biochars need to be explored to potentially increase biochar dosage while maintaining Portland cement composites’ properties; (3) the analysis of batching factors, including cement types, concrete batching type and combining biochar with other SCMs and reinforcement, needs to be conducted to figure out how biochar works in specific Portland cement composites; (4) the measurements for parameters of Portland cement composites need to be extended to quantify the overall effect of biochar addition; (5) the leaching risk of biochar constituents, such as polycyclic aromatic hydrocarbons and heavy metal, needs to be estimated to evaluate the health risks of biochar addition to Portland cement composites (Duan et al 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Biochar affects compressive strength of Portland cement composites: a meta-analysis

Zhao,

El-Naggar,

Kau

et al. 2024

Biochar

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One strategy to reduce CO2 emissions from cement production is to reduce the amount of Portland cement produced by replacing it with supplementary cementitious materials (SCMs). Biochar is a potential SCM that is an eco-friendly and stable porous pyrolytic material. However, the effects of biochar addition on the performances of Portland cement composites are not fully understood. This meta-analysis investigated the impact of biochar addition on the 7- and 28-day compressive strength of Portland cement composites based on 606 paired observations. Biochar feedstock type, pyrolysis conditions, pre-treatments and modifications, biochar dosage, and curing type all influenced the compressive strength of Portland cement composites. Biochars obtained from plant-based feedstocks (except rice and hardwood) improved the 28-day compressive strength of Portland cement composites by 3–13%. Biochars produced at pyrolysis temperatures higher than 450 °C, with a heating rate of around 10 C min-1, increased the 28-day compressive strength more effectively. Furthermore, the addition of biochar with small particle sizes increased the compressive strength of Portland cement composites by 2–7% compared to those without biochar addition. Biochar dosage of < 2.5% of the binder weight enhanced both compressive strengths, and common curing methods maintained the effect of biochar addition. However, when mixing the cement, adding fine and coarse aggregates such as sand and gravel affects the concrete and mortar's compressive strength, diminishing the effect of biochar addition and making the biochar effect nonsignificant. We concluded that appropriate biochar addition could maintain or enhance the mechanical performance of Portland cement composites, and future research should explore the mechanisms of biochar effects on the performance of cement composites. Graphical Abstract

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Section: Resultsmentioning

confidence: 99%