Effect of high temperatures on the mechanical behaviour of hybrid cement

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-02-18 DOI:10.3989/mc.2020.13318

B. Qu, A. Fernández Jiménez, A. Palomo, A. Martin, J. Pastor

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引用次数: 8

Abstract

The high-temperature mechanical behaviour of a pre-industrial hybrid alkaline cement (HYC) was studied. The HYC in question contained 30 % Portland clinker and 70 % of a blend of slag, fly ash and a solid activator (mix of alkaline salts with a predominance of Na 2 SO 4 ). The material was tested during exposure to high temperatures to establish its compressive and bending strength and elastic modulus, as well as fracture toughness, analysed using an innovative methodology to notch the hydrated cement paste specimens. Post-thermal treatment tests were also run to assess residual mechanical strength after 2 h of exposure to temperatures ranging from 400 °C to 1000 °C. TG/DTA, MIP and SEM were deployed to ascertain heat-induced physical-chemical changes in the structure. The higher mechanical strength during and after treatment exhibited by the hardened hybrid alkaline cement than the CEM I 42.5R ordinary portland cement (OPC) paste used as a reference was associated with the lower water and portlandite content found in HYC. Pseudo-plastic behaviour was observed at high temperatures in the loaded HYC in the tests conducted during exposure.

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高温对混合水泥力学性能的影响

研究了工业化前混合碱性水泥（HYC）的高温力学行为。所讨论的HYC含有30%的波特兰熟料和70%的矿渣、粉煤灰和固体活化剂的混合物（碱性盐的混合物，主要是Na2SO4）。在暴露于高温的过程中对该材料进行了测试，以确定其压缩和弯曲强度、弹性模量以及断裂韧性，并使用创新的方法对水合水泥浆试样进行了分析。还进行了热处理后试验，以评估暴露在400°C至1000°C温度下2小时后的残余机械强度。采用TG/DTA、MIP和SEM来确定热引起的结构的物理化学变化。硬化混合碱性水泥在处理期间和处理后表现出比用作参考的CEM I 42.5R普通硅酸盐水泥（OPC）浆体更高的机械强度，这与HYC中发现的较低的水和硅酸盐含量有关。在暴露期间进行的测试中，在高温下在负载的HYC中观察到伪塑性行为。

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.