Effect of anti-washout admixture on the compressive strength of alkali-activated underwater non-dispersible concrete

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

Magazine of Concrete Research Pub Date : 2023-05-02 DOI:10.1680/jmacr.22.00239

Zhongzhe Zhang, Yong-sheng Ji, Zhanguo Ma, Yanpeng Zhao, Zhishan Xu, Furong Gao, Qi Xue, M. Ma

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Abstract

The issue of low compressive strength in concrete is primarily caused by the anti-washout admixture (AWA) added to cement-based cementitious materials (CBCMs). In this paper, the AWA was added to alkali-activated cementitious materials (AACM) to prepare underwater non-dispersible concrete (UNDC). The effect of different AWA contents on the compressive strength of AACM was studied by measuring the compressive strength, hydration process, pore structure, microscopic appearance, and chemical composition. The results show that the compressive strength of AACM-UNDC moulded underwater can reach higher than 80% of the compressive strength of AACM-UNDC moulded on land. The polymerization and decomposition reaction of AACM can lead to the formation of strong covalent bonds, which can not only interweave with the long chain structure of AWA to form a dense network structure, but also can avoid the AWA wrapping on the surface of the activated material through the charge effect, and hinder the hydration reaction process of AASM.

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抗冲剂对碱活性水下不分散混凝土抗压强度的影响

混凝土抗压强度低的问题主要是由添加到水泥基胶结材料（CBCM）中的抗冲刷外加剂（AWA）引起的。本文在碱活性胶凝材料（AACM）中加入AWA，制备水下不分散混凝土（UNDC）。通过测定AACM的抗压强度、水化过程、孔隙结构、微观形貌和化学成分，研究了不同AWA含量对AACM抗压强度的影响。结果表明，水下成型AACM-UNDC的抗压强度可达到陆地成型AACM-UNIDC抗压强度的80%以上。AACM的聚合和分解反应可以导致形成强共价键，不仅可以与AWA的长链结构交织形成致密的网络结构，还可以通过电荷效应避免AWA包裹在活性材料表面，阻碍AAM的水化反应过程。

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.