Investigation of anionic group characteristics of PCEs on the behavior of fly ash cementitious systems

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2024-04-07 DOI:10.1680/jadcr.23.00201

Kemal Karakuzu, Veysel Kobya, Ali Mardani, Burak Felekoğlu, Kambiz Ramyar

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引用次数: 0

Abstract

This study investigated the compatibility of polycarboxylate-based water reducing admixtures (PCE) having different carboxylate, phosphate and sulfonate anionic groups with paste and mortar mixtures containing fly ash. According to the results, with the increase of the fly ash content of the mixtures, PCE requirement for the target flow decreased, as well as consistency retention performance improved due to the decrease in the amount of hydrated cement. An improvement in rheological parameters was observed with the increase in fly ash content from 15% to 30%. However, increasing the fly ash replacement level beyond 30% caused stability problems in the mixtures. This problem was eliminated with PCE addition. In the paste and mortar mixtures, regardless of the fly ash substitution ratio, the best performance was obtained with PCEs containing 7% and 5% phosphate and sulfonate, respectively. The most suitable fly ash replacement ratio in terms of rheological parameters and 28-day compressive strength was 30% and 15%, respectively. It was observed that PCE anionic group content did not have any significant effect on all fly ash substitution ratios.

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研究聚氯乙烯阴离子基团特性对粉煤灰胶凝体系行为的影响

本研究调查了具有不同羧酸盐、磷酸盐和磺酸盐阴离子基团的聚羧酸盐基减水剂（PCE）与含粉煤灰的浆料和砂浆混合物的相容性。结果表明，随着混合物中粉煤灰含量的增加，目标流动度所需的 PCE 量减少，同时由于水化水泥量减少，稠度保持性能也得到改善。随着粉煤灰含量从 15% 增加到 30%，流变参数也有所改善。然而，粉煤灰替代量增加到 30% 以上时，混合物的稳定性就会出现问题。添加 PCE 后，这一问题得以解决。在糊状混合物和砂浆混合物中，无论粉煤灰替代率如何，磷酸盐和磺酸盐含量分别为 7% 和 5% 的聚合氯化铝的性能最佳。就流变参数和 28 天抗压强度而言，最合适的粉煤灰替代率分别为 30% 和 15%。据观察，PCE 阴离子基团含量对所有粉煤灰替代率均无显著影响。

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

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.