Pozzolanic activity of argentine vitreous breccia containing mordenite

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-02-17 DOI:10.3989/mc.2020.04019

V. Bonavetti, V. Rahhal, F. Locati, E. Irassar, S. Marfil, P. Maiza

引用次数: 2

Abstract

A vitreous breccia with variable amount of mordenite was studied for its use as pozzolan. The raw material was characterized by optical and scanning electron microscopy (SEM), X-ray diffraction (XRD), and the zeolite content was estimated by the methylene blue staining technique. After being ground, physical characteristics, cation exchange capacity (CEC), pozzolanicity, and the compressive strength activity index (SAI) were determined. The staining technique and the CEC measurement were used to evaluate the average content of zeolite. The vitreous breccia has pozzolanic activity after 7 days, the water demand increases slightly, and its addition stimulates the early hydration of portland cement. At later ages, the pozzolanic reaction around the grains, as revealed by SEM studies, improves the compressive strength of blended cements having a SAI > 0.85 at 28 days.

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含丝光沸石的阿根廷玻璃质角砾岩的火山活动

研究了一种含有不同数量丝光沸石的玻璃角砾岩用作火山灰。通过光学和扫描电子显微镜（SEM）、X射线衍射（XRD）对原料进行表征，并通过亚甲基蓝染色技术估算沸石含量。在研磨后，测定了物理特性、阳离子交换容量（CEC）、火山灰性和抗压强度活性指数（SAI）。采用染色技术和CEC测定法对沸石的平均含量进行了评价。玻璃角砾岩在7天后具有火山灰活性，需水量略有增加，其加入刺激了硅酸盐水泥的早期水化。在后期，SEM研究表明，颗粒周围的火山灰反应提高了28天SAI>0.85的混合水泥的抗压强度。

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.