Mortar Properties Improvement by Using Fine Portland Cement Clinker as Reactive Aggregate

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-03-10 DOI:10.22068/IJMSE.18.1.5

Jafar Shafaghat, A. Allahverdi

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引用次数: 1

Abstract

: Microscopic studies has shown that adjacent to the interface between cement paste and aggregate, there exists an area with high porosity and low binding compounds that is referred to as interfacial transition zone (ITZ). ITZ in concrete and mortar imposes a number of negative effects, including flexural and compressive strengths reduction and permeability enhancement. That’s why many research attempts have been devoted to limit ITZ and its negative effects. The present study investigates the possibility of utilizing fine Portland cement (PC) clinker as a reactive aggregate in mortar for the same purpose. For this, natural quartz sand in normal mortar (NM) was totally replaced with PC clinker of the same particle size distribution and the most important engineering properties of the new mortar referred to as Reactive Aggregate Mortar (RAM) were measured and compared with NM as control. The results of compressive strengths measurements represented 65 and 21% increase after curing age of 7 and 90 days, respectively, for RAM compared to NM. Chloride penetration depth in RAM displayed reductions by about 33 and 26% after 14 and 28 days of exposure, respectively. The effect of PC clinker reactivity on the microstructure and size of ITZ was studied by using scanning electron microscopy.

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用细硅酸盐水泥熟料作活性骨料改善砂浆性能

微观研究表明，在水泥浆体与骨料界面附近，存在一个孔隙率高、结合度低的区域，称为界面过渡区(interface transition zone, ITZ)。混凝土和砂浆中的ITZ会产生许多负面影响，包括抗折和抗压强度降低以及渗透性增强。这就是为什么许多研究尝试致力于限制ITZ及其负面影响。本研究探讨了利用细硅酸盐水泥熟料作为活性骨料在砂浆中达到相同目的的可能性。为此，将普通砂浆(NM)中的天然石英砂完全替换为相同粒径分布的PC熟料，并测量了新型砂浆(即反应骨料砂浆(RAM))最重要的工程性能，并与普通砂浆(NM)作为对照进行了比较。抗压强度测量结果表明，与NM相比，RAM在养护7天和90天后分别增加了65%和21%。暴露14天和28天后，RAM中的氯化物渗透深度分别减少了33%和26%。利用扫描电镜研究了PC熟料反应性对ITZ的微观结构和尺寸的影响。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.