Influence of polycarboxylate superplasticizer and polyacrylamide on mirror effect of fair-faced concrete

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-07-22 DOI:10.1680/jmacr.24.00122

Hongxiang Zheng, Weizhun Jin, Liang Wang, Binbin Na, Zhengxiang Lin, Jinghui Zhang, Qinghua Huang, Linhua Jiang

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Abstract

This work successfully prepared fair-faced concrete with mirror effect. The gray value standard deviation, porosity, crack rate and glossiness of the concrete surface were used to characterize the apparent quality of fair-faced concrete. The effect of polycarboxylate superplasticizer and polyacrylamide viscosity-modifying admixture on mirror effect of fair-faced concrete was investigated. The changes of hydration products and microstructure of fair-faced concrete were monitored by the measurements of X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and mercury intrusion porosity (MIP), and the potential mechanism was analyzed. The results indicate that the polyacrylamide reduces the number and size of Ca(OH)2 and change the morphology of Ca(OH)2 crystals from large-size parallel stacking state to small-size edge corrosion structure. The polyacrylamide can refine the pore size of concrete, the most probable pore size at the optimum dosage is 13.73 nm, which is much lower than that at other dosages. The usage of the polycarboxylate superplasticizer will introduce air, which has adverse effect on the concrete surface. But polycarboxylate superplasticizer can also improve the flowability of concrete and make bubbles easy to discharge. The combined action of polycarboxylate superplasticizer and polyacrylamide contributes the fair-faced concrete for better mirror effect.

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聚羧酸盐超塑化剂和聚丙烯酰胺对清水混凝土镜面效果的影响

这项工作成功制备了具有镜面效果的清水混凝土。采用灰度标准偏差、孔隙率、裂缝率和混凝土表面光泽度来表征清水混凝土的表观质量。研究了聚羧酸盐超塑化剂和聚丙烯酰胺粘度调节剂对清水混凝土镜面效果的影响。通过 X 射线衍射 (XRD)、热重分析 (TG)、扫描电子显微镜 (SEM) 和汞侵入孔隙率 (MIP)，监测了清水混凝土水化产物和微观结构的变化，并分析了潜在的机理。结果表明，聚丙烯酰胺降低了 Ca（OH）2 的数量和尺寸，并使 Ca（OH）2 晶体的形态从大尺寸平行堆积状态变为小尺寸边缘腐蚀结构。聚丙烯酰胺可以细化混凝土的孔径，最佳用量下最可能的孔径为 13.73 nm，远低于其他用量。使用聚羧酸盐超塑化剂会引入空气，对混凝土表面产生不利影响。但聚羧酸盐超塑化剂还能改善混凝土的流动性，使气泡易于排出。聚羧酸盐超塑化剂和聚丙烯酰胺的共同作用可使混凝土表面光滑，达到更好的镜面效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.