Biochar as a cost-effective and eco-friendly substitute for binder in concrete: a review

Singhal, Shailey

doi:10.1080/19648189.2022.2068658

Cited by 22 publications

(6 citation statements)

References 142 publications

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“…Biochar can improve soil physical and chemical properties, mitigate greenhouse gas emissions, and remediate soil pollution, among other benefits (He et al 2022 ; Osman et al 2022 ; Singh et al 2022 ). Using biochar as SCMs in civil engineering is an emerging field supported by promising results (Danish et al 2021 ; Singhal 2023 ; Tan et al 2021 ). For instance, biochar addition to Portland cement composites has shown to promote heat evolution of hydration (Sikora et al 2022 ; Zhang et al 2022a , b , c ).…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…About biochar, we have mentioned the fact that it is compatible with concrete. A recent review about the use of biochar in concrete (Singhal, 2022), tells that biochar is an efficient absorber for EM radiations, besides allowing "buildings to be turned into carbon sinks". For what is regarding the use of biochar in different matrices (included concrete) for EMI-SE evaluation, see please Torsello et al, 2021.…”

Section: Appendix: Biochar@concretementioning

confidence: 99%

Iron Oxide Fe3O4 Nanoparticles for Electromagnetic Shielding

Sparavigna

2023

Preprint

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Magnetic iron oxide nanoparticles (Fe3O4) can be dispersed in a supporting material so that the composite can better respond to electromagnetic fields, absorbing a part of their energy. In the discussion here proposed, therefore, we will consider the role of these nanoparticles in the applications for electromagnetic interference (EMI) shielding. Inserted in intrinsically conducting polymers (ICPs) for instance, the nanoparticles are increasing EMI shielding effectiveness of polymer, producing light weight "absorption-type" shields, which are specifically relevant for absorbing microwaves. Composite materials, based on Fe3O4 nanoparticles with polypyrrole or polyaniline, will be considered in detail. Other materials, such as the recent biochar-based composites, will be discussed too.

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“…About biochar, we have mentioned the fact that it is compatible with concrete. A recent review about the use of biochar in concrete (Singhal, 2022), tells that biochar is an efficient absorber for EM radiations, besides allowing "buildings to be turned into carbon sinks". Singhal mentions the works by Yasir et al, 2020, who studied shielding properties of cement composites with commercial biochar.…”

Section: Appendix: Biochar@concretementioning

confidence: 99%