Characterization of sugarcane bagasse ash as a potential supplementary cementitious material: Comparison with coal combustion fly ash
Characterization of sugarcane bagasse ash as a potential supplementary cementitious material: Comparison with coal combustion fly ash
复制标题
DOI：
10.1016/j.jclepro.2020.123834
复制
发表时间：
2020-12
影响因子：
11.1
通讯作者：
Ping Zhang;Wenyu Liao;Aditya Kumar;Qian Zhang;Hongyan Ma
中科院分区：
文献类型：
--
作者：
Ping Zhang;Wenyu Liao;Aditya Kumar;Qian Zhang;Hongyan Ma
本研究旨在评估蔗渣灰(SCBA)作为辅助胶凝材料(SCM)的组成潜力。以燃煤飞灰(CFA)为基准，采用多种手段对SCBA进行了全面的表征，测定和比较了颗粒大小、颗粒形态、化学成分、玻璃含量、元素分布和化学状态。结果表明，SCBA具有细粒径(D50=66.76μm，CFA为2.2μm)、高玻璃含量(78.5wt%，CFA为81wt%)和相对稳定的化学组成，是一种潜在的有效的SCM。SCBA的玻璃成分以无定形二氧化硅为主(77.2%，CFA为53.6%)，在火山灰反应中可形成二次水化硅酸钙。然而，SCBA不含球形玻璃颗粒，而含有大量多孔性颗粒，这可能会影响新鲜状态水泥基材料的工作性。SCBA的另外两个不利因素是高碳和高钾含量，这可能会影响水泥基材料的性能。然而，由于它们的存在形式(即X射线光电子能谱揭示的光或可溶的)，这些有害影响可以通过洗涤来减轻。基于文献调查的分析表明，本研究所采用的灰样具有代表性，因此本研究得出的结论具有普遍意义。
This study aims to evaluate the potential of sugarcane bagasse ash (SCBA) as a supplementary cementitious material (SCM) in terms of composition. Using coal-combustion fly ash (CFA) as the benchmark, SCBA is characterized thoroughly using multiple tools to determine and compare particle size, particle morphology, chemical composition, glass content, element distribution and chemical status. It is found that SCBA has fine particle size (d50= 6.76 μm, compared to 2.2 μm of CFA), high glass content (78.5 wt%, compared to 81 wt% of CFA), and relatively stable chemical composition, making it a potential effective SCM. The glass content of SCBA is dominated by amorphous silica (77.2%, compared to 53.6% of CFA), which can lead to formation of secondary calcium silicate hydrates in pozzolanic reactions. However, SCBA contains no spherical glass grains but many porous grains, which may compromise the workability of fresh-state cement-based materials. Another two detriments of SCBA are high carbon and potassium contents, which could potentially interfere the performance of cement-based materials. However, due to their existence forms (i.e., either light or dissolvable, as revealed by X-ray photoelectron spectroscopy), these detrimental effects can be mitigated through washing. A literature-survey based analysis shows that the ash samples adopted in this study are representative, so the conclusions drawn from this study are generally meaningful.