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Nano-montmorillonite modified foamed paste with a high volume fly ash binder

机译：纳米蒙脱土改性的泡沫膏，带有大量的粉煤灰粘合剂

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This laboratory study explores a cost-effective and environmental friendly foamed paste with satisfactory physical properties and outstanding thermal insulation properties. Such a composite material was made by using a high volume of class F coal fly ash as a replacement of Portland cement (70% by mass) and nano-montmorillonite as an admixture. Replacing cement with fly ash at high levels is environmentally and economically desirable, as this not only reduces the energy and carbon footprint of the foamed paste, but also diverts the coal fly ash from the waste stream. A statistical design of experiments was adopted and executed to investigate the effects of various factors on the properties of the composite. At the age of 28 days, the pastes exhibited a high compressive strength ranging from 1.77 MPa to 6.51 MPa and a low thermal conductivity in the range of 0.071 W (m?1 K?1) to 0.173 W (m?1 K?1). Two foamed mixes were chosen for further investigation as they presented the best and worst performance as a thermal insulation material. The scanning electron microscopy shed light on the best foamed mix, which contains 70% fly ash, 30% cement, and 1% nano-montmorillonite, and how its microstructure differed from that of the worst mix without nano-montmorillonite. The Ca content, Si/Ca ratio and Al/Ca ratio were obtained from energy-dispersive X-ray spectroscopy of hardened samples, and used to help explain the observed strength difference between these two mixes. X-ray diffraction was also employed to elucidate the hydration mechanism of HVFC foamed paste.
机译：这项实验室研究探索了具有令人满意的物理性能和出色的隔热性能的经济高效且环保的泡沫糊。这种复合材料是通过使用大量的F级粉煤灰代替波特兰水泥（按质量计70％）和纳米蒙脱土作为混合物制成的。在环境和经济上，用粉煤灰代替水泥是理想的环保和经济选择，因为这不仅减少了泡沫糊的能量和碳足迹，而且从废物流中转移了粉煤灰。采用统计设计的实验并执行以研究各种因素对复合材料性能的影响。在28天的龄期中，这些糊料表现出1.77 MPa至6.51 MPa的高抗压强度，且在0.071 W范围内具有较低的热导率（m ？1 K ？1 ）至0.173 W（m ？1 K ？1 ）。选择两种泡沫混合物进行进一步研究，因为它们作为隔热材料表现出最佳和最差的性能。扫描电子显微镜揭示了最佳的泡沫混合物，其中包含70％的粉煤灰，30％的水泥和1％的纳米蒙脱石，其微观结构与没有纳米蒙脱石的最差混合物的微观结构有何不同。 Ca含量，Si / Ca比和Al / Ca比是从硬化样品的能量色散X射线光谱学获得的，用于帮助解释这两种混合物之间观察到的强度差异。还使用X射线衍射阐明了HVFC泡沫糊的水合机理。

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