Effect of admixed silicone emulsion on water and chloride transport properties of concrete

IF 12.7 1区 材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY
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Abstract

The addition of silicone is effective method for improving both surface and internal hydrophobicity of concrete, thus clarifying its effect on transport property of concrete is very important. In this study, both water and chloride transport properties of concrete incorporated with three silicone emulsions based on different active ingredients (silane oligomers or silane monomers) were evaluated and investigated. The results show that all three silicone emulsions exhibit no obvious negative effect on hydration and microstructure of cement paste; however, the admixed silicone emulsions increase both the thickness and porosity of ITZ in concrete. Therefore, the admixed silicone emulsions result in reduced compressive strength of concrete. Further, the incorporated silicone emulsions efficiently increase surface and internal water contact angle of concrete, thus mitigating both water absorption and chloride transport in concrete. Due to more pronounced interaction between silane oligomers and hydration products based on molecular dynamics simulation, the beneficial effect on improving hydrophobicity of concrete and halting water and chloride transport is more significant for the admixed silicone emulsion with silane oligomers as active ingredient.

Abstract Image

掺入有机硅乳液对混凝土水和氯离子迁移性能的影响
添加有机硅是改善混凝土表面和内部憎水性的有效方法,因此明确有机硅对混凝土迁移特性的影响非常重要。在这项研究中,对掺入了基于不同活性成分(硅烷低聚物或硅烷单体)的三种有机硅乳液的混凝土的水和氯离子迁移性能进行了评估和研究。结果表明,三种有机硅乳液对水泥浆的水化和微观结构都没有明显的负面影响;但是,掺入的有机硅乳液会增加混凝土中 ITZ 的厚度和孔隙率。因此,掺入的有机硅乳液会降低混凝土的抗压强度。此外,掺入的有机硅乳液还能有效增加混凝土的表面和内部水接触角,从而减轻混凝土的吸水性和氯离子迁移。根据分子动力学模拟,硅烷低聚物与水化产物之间的相互作用更为明显,因此以硅烷低聚物为活性成分的掺入型有机硅乳液在改善混凝土憎水性、阻止水和氯离子迁移方面的效果更为显著。
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来源期刊
Composites Part B: Engineering
Composites Part B: Engineering 工程技术-材料科学:复合
CiteScore
24.40
自引率
11.50%
发文量
784
审稿时长
21 days
期刊介绍: Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.
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