Carbon capture and storage potential of biochar-enriched cementitious systems
Carbon capture and storage potential of biochar-enriched cementitious systems
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富含生物炭的胶凝系统的碳捕获和储存潜力
DOI：
10.1016/j.cemconcomp.2023.105078
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发表时间：
2023
影响因子：
10.5
通讯作者：
Konsta-Gdoutos, Maria S.
中科院分区：
文献类型：
--
作者：
Mishra, Geetika;Danoglidis, Panagiotis A.;Shah, Surendra P.;Konsta-Gdoutos, Maria S.
消除民用基础设施净温室气体排放的一个有希望的解决方案是在混凝土制造中使用负碳材料。碳中性煤灰和农业/林业副产品，如生物炭，具有很高的二氧化碳吸收潜力。该研究的目的是探索使用生物炭作为碳汇的可行性，并开发具有改进性能的碳中性混凝土。实验结果表明，生物炭的最佳添加量（1%）对水化性能和力学性能略有改善，但与矿物添加剂的组合显著提高了性能。热重分析（TGA）表明，与OPC相比，添加1%的生物炭可使co2吸收量增加42%，而生物炭与10%的C类粉煤灰混合可使混合物的co2捕集能力进一步提高92%。在加速碳化条件下，生物炭富集砂浆的弹性模量比参考碳化OPC高20%，表明其刚度有效增加。碳化生物炭砂浆的韧性指标提高了64%，表明材料在应变软化阶段具有很强的抗裂纹合并和扩展能力。扫描电镜和能量色散x射线能谱（SEM-EDS）结果证实了我们的预测，即生物炭的多孔形态促进了二氧化碳的吸收和碳酸钙的原位矿化，从而形成了更致密、更强的水泥基质。
A promising solution to nullify the net embodied greenhouse gas emissions of civil infrastructure is the use of carbon-negative materials for concrete manufacturing. Carbon-neutral coal ash and agriculture/forestry by-products, such as biochar, exhibit a high carbon dioxide (CO2) uptake potential. The aim of the study is to explore the viability of using biochar as a carbon sink and to develop carbon-neutral concrete with improved performance. Experimental findings suggest that the optimal amount of biochar (1%) slightly improves hydration and mechanical properties, but the combination with mineral additives significantly enhances the performance. Thermogravimetric analysis (TGA) revealed that compared to OPC, the addition of 1% biochar contributes to a 42% increase in CO2uptake, while the combination of biochar with 10% class C fly ash further increases CO2capture capacity of the mix by 92%. Under accelerated carbonation conditions, the biochar-enriched mortars exhibit a 20% higher modulus of elasticity indicating an effectively increased stiffness over the reference carbonated OPC. The carbonated biochar mortars also exhibit up to 64% increased toughness indices indicating the material's great resistance to crack coalescence and propagation at the strain softening stage. Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDS) results validated our prediction that the porous morphology of biochar promoted enhanced CO2absorption and in-situ mineralization of calcium carbonate, resulting in a denser and stronger cement matrix.
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影响因子：
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作者：
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