论磷酸盐系超塑化剂在单组分碱活性矿渣中的作用机理

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2024-09-06 DOI:10.1016/j.cemconres.2024.107659
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引用次数: 0

摘要

关于聚羧酸醚(PCE)超塑化剂在双组份碱激活炉渣(AAS)中分散能力受损或丧失的机理,已经进行了广泛的研究,但对于聚羧酸醚在单组份 AAS 体系(尤其是使用更环保的碳酸盐基固体活化剂制备的体系)中如何发挥作用或丧失其分散效率的科学认识还很有限。本研究调查了磷酸盐型聚氯乙烯在由 KCO 或 KCO 和 CaO 组合活化的单组分 AAS 中的分散和吸附行为。我们的研究结果表明,在 KCO 活化的熔渣体系中,磷酸盐基聚合氯化铝效率的降低主要是由于聚合氯化铝分子的构象收缩,从而削弱了碱性活化溶液中的立体斥力,而不是由于聚合氯化铝在碱性溶液中的不溶性或聚合氯化铝与溶解熔渣颗粒上的碳酸盐阴离子之间的竞争性吸附。在 KCO-CaO 活化矿渣体系中,当 PCE 的用量低于 5 mg/g 时,早期沉淀物(如 C-A-S-H、gaylussite、方解石)对 PCE 的消耗会大大增加其效率损失;然而,一旦 PCE 的用量超过这一临界值,影响 PCE 效率的主要因素就会转变为 PCE 的构象变化。
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On the action mechanism of phosphate-based superplasticizers in one-part alkali-activated slag

The mechanisms responsible for the compromised or lost dispersing capability of polycarboxylate ether (PCE) superplasticizers in two-part alkali-activated slag (AAS) have been extensively studied, but limited scientific understanding is available on how PCEs function or lose their dispersing efficiency in one-part AAS systems, particularly those prepared using greener carbonate -based solid activators. This study investigates the dispersing and adsorption behaviors of phosphate-based PCE in one-part AAS activated by K2CO3 or a combination of K2CO3 and CaO. Our findings indicate that in K2CO3-activated slag systems, the loss of phosphate-based PCE efficiency primarily results from the conformational contraction of PCE molecules, which deteriorates steric repulsion in the alkaline activating solution, rather than the insolubility of PCEs in alkaline solution or competitive adsorption between PCEs and carbonate anions on dissolving slag grains. In K2CO3-CaO-activated slag systems, when PCE dosage is below 5 mg/g, the consumption of PCE by early precipitates (e.g., C-A-S-H, gaylussite, calcite) contributes substantially to its lost efficiency; however, once the PCE dosage surpasses this threshold, the dominant factor influencing PCE efficiency shifts to the conformational change of PCE.

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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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