Application of electro-injection method in improving cement mortar durability

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

Magazine of Concrete Research Pub Date : 2023-08-18 DOI:10.1680/jmacr.22.00063

Hongyou Shan, Jinxia Xu, Yuanhai Jiang, Hongfei Liu, Gang Zheng, Guomin Cui

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引用次数: 1

Abstract

An electrochemical method for improving durability of cement mortar by injection of nanoparticle (Al2O3 coated SiO2) is presented. In this method, nanoparticles are injected into cement mortar pores under an external electrical field, refining pore structure of cement mortar. The efficiency of electro-injection nano-particle treatment with different applied electric fields was evaluated by monitoring the evolution of cement mortar resistivity. The improvement of cement mortar durability after electro-injection of nano-particle treatment was assessed by examining the resistance to water absorption, carbonation, sulfate resistance and chloride diffusion. The microstructure of cement mortar after the electro-injection treatment was analyzed using Scanning Electron Microscope (SEM), Mercury Intrusion Porosimetry (MIP), X-Ray Diffraction (XRD) and Differential Thermo-Gravimetric Analysis (DTG). The results show that improving cement mortar durability by the injection of nanoparticle under external electric field can be obtained. The efficiency of electro-injection nano-particle treatment increased with the increasing of applied electric field. The resistance to water absorption, carbonation, sulfate attack and chloride diffusion were significantly improved by using the electro-injection method. The improvement in cement mortar durability can be attributed to the filling effect of nanoparticles.

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电喷射法在提高水泥砂浆耐久性中的应用

提出了一种注入纳米颗粒(Al2O3包覆SiO2)提高水泥砂浆耐久性的电化学方法。该方法在外加电场作用下，将纳米颗粒注入水泥砂浆孔隙中，细化水泥砂浆孔隙结构。通过监测水泥砂浆电阻率的变化，评价了不同外加电场下电注入纳米颗粒处理的效率。通过检测纳米颗粒电注入后水泥砂浆的吸水性能、抗碳化性能、抗硫酸盐性能和氯离子扩散性能，评价纳米颗粒电注入后水泥砂浆耐久性的提高。采用扫描电镜(SEM)、压汞孔隙法(MIP)、x射线衍射(XRD)和差热重分析(DTG)对电注入水泥砂浆的微观结构进行了分析。结果表明，在外加电场作用下注入纳米颗粒可以提高水泥砂浆的耐久性。电注入纳米颗粒处理的效率随着外加电场的增大而增大。电注入法显著提高了材料的吸水性能、抗碳化性能、抗硫酸盐侵蚀性能和抗氯离子扩散性能。纳米颗粒的填充作用是提高水泥砂浆耐久性的主要原因。

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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.