评估甘蔗渣粉煤灰作为可持续水泥替代品对提高性能的作用

IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Cleaner Engineering and Technology Pub Date : 2024-05-04 DOI:10.1016/j.clet.2024.100751
Ketlynn Passos Alvarenga, Guilherme Chagas Cordeiro
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引用次数: 0

摘要

本研究评估了甘蔗渣飞灰作为一种可再生补充胶凝材料的潜力,甘蔗渣飞灰是通过旁路管道从锅炉排气烟囱中收集的。甘蔗渣粉煤灰被研磨成三种不同的颗粒大小(D50 分别为 10、20 和 30 μm),并在形态、孔隙率、比表面积和水胶活性方面进行了表征。使用等温量热法研究了灰烬对浆料水化的影响。然后测试了粉煤灰替代 20% 水泥的砂浆,分析了填料密度、抗压强度变化和耐硫酸的耐久性。结果表明,粉煤灰适合作为一种补充胶凝材料,在粒径较小的情况下,粉煤灰的污染程度低,且具有更强的热固性。这增强了初始水化和长期强度,与参考砂浆相比,较细的粉煤灰显示出更优越的机械性能(增加了 8%)。与参考灰泥相比,含有粉煤灰的灰泥表现出更高的堆积密度,并减少了硫酸侵蚀下的质量损失,但吸水率和毛细管增加,同时抗压强度降低。简而言之,研究结果凸显了甘蔗渣粉煤灰作为可持续建筑实践中一种低成本、有益生态的材料的潜力。
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Evaluating sugarcane bagasse fly ash as a sustainable cement replacement for enhanced performance

This study evaluated the potential of sugarcane bagasse fly ash, collected from boiler exhaust stacks via a bypass pipe, as a renewable supplementary cementitious material. The bagasse fly ash was ground into three different particle sizes (D50 of 10, 20, and 30 μm) and characterized in terms of morphology, porosity, specific surface area, and pozzolanic activity. The influence of the ashes on paste hydration was investigated using isothermal calorimetry. Mortars were then tested with 20% cement replacement by fly ash, analyzing packing density, compressive strength evolution, and durability against sulfuric acid. Results indicated the suitability of the fly ash as a supplementary cementitious material, with low contamination and greater pozzolanic activity at smaller particle sizes. This enhanced initial hydration and long-term strength, with finer ashes showing superior mechanical properties when compared to the reference mortar (an 8% increase). Mortars with fly ash exhibited higher packing density and reduced mass loss under sulfuric acid attack, but increased water absorption and capillarity, alongside decreased compressive strength compared to the reference. Briefly, the findings highlighted that the potential of bagasse fly ash as a promising low cost and eco-beneficial material for sustainable construction practices.

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来源期刊
Cleaner Engineering and Technology
Cleaner Engineering and Technology Engineering-Engineering (miscellaneous)
CiteScore
9.80
自引率
0.00%
发文量
218
审稿时长
21 weeks
期刊最新文献
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