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首页> 外文期刊>Cement and Concrete Research >Effects of flue gas desulphurization sludge on the pozzolanic reaction of reject-fly-ash-blended cement pastes
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Effects of flue gas desulphurization sludge on the pozzolanic reaction of reject-fly-ash-blended cement pastes

机译：烟气脱硫污泥对废粉煤灰掺合水泥浆火山灰反应的影响

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摘要

Reject fly ash (rFA), a coarse portion of the pulverized fuel ash (PFA) produced from coal-fired power plants and rejected from the ash classifying process, has remained unused due to its high carbon content and large particle size (>45 mu m). However, the reject ash may have potential uses in chemical stabilization/solidification (S/S) processes that require relatively low strength and low chemical reactivity. Flue gas desulphurization (FGD) sludge is a by-product of the air pollution control process in coal-fired power plants. Its chemical composition is mainly gypsum. As there is no effective usage of both of these materials, it was of interest to conduct research on the possible activation of rFA using FGD. This paper presents experimental results of the effect of FGD on the pozzolanic reaction of rFA-blended cement pastes with or without Ca(OH)_2 and chemical activators. The results show that FGD take effect as an activator only at late curing ages. Adding Ca(OH)_2 activates the hydration of rFA. Chemical activator, such as alkali sulphate, is more effective in enhancing the strength development and degree of hydration of rFA than CaCl_2 in the rFA-Ca(OH)_2-cement system. But CaCl_2 is more effective in the rFA-Ca(OH)_2-FGD-cement system. The chemical activators speed up the reaction of the rFA through the formation new hydration products and elevating the pH value.
机译：拒绝粉煤灰（rFA）是燃煤电厂生产的粉状燃料灰（PFA）的较粗部分，被灰分选过程所拒绝，由于其高碳含量和大粒径（> 45μm m）。但是，废料灰可能在化学稳定/固化（S / S）过程中具有潜在用途，这些过程需要相对较低的强度和较低的化学反应性。烟气脱硫（FGD）污泥是燃煤电厂空气污染控制过程的副产品。其化学成分主要是石膏。由于这两种材料均未有效使用，因此有兴趣进行有关使用FGD激活rFA的研究。本文介绍了FGD对含或不含Ca（OH）_2和化学活化剂的rFA掺合水泥浆的火山灰反应的实验结果。结果表明，FGD仅在固化后期才作为活化剂起作用。添加Ca（OH）_2可激活rFA的水合。在rFA-Ca（OH）_2-水泥体系中，化学活化剂（如碱式硫酸盐）比CaCl_2更有效地增强rFA的强度发展和水合度。但是CaCl_2在rFA-Ca（OH）_2-FGD-水泥系统中更有效。化学活化剂通过形成新的水合产物并提高pH值来加快rFA的反应。

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