Combined effect of nano-SiO 2 and nano-Fe 2 O 3 on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2018-03-05 DOI:10.3989/MC.2018.10716

M. Sanjuán, C. Argiz, J. Gálvez, E. Reyes

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引用次数: 13

Abstract

The compressive strength, flexural strength, porosity and electrical resistivity properties of cement mortars with nano-Fe 2 O 3 and nano-SiO 2 are studied. Amorphous silica is the main component of pozzolanic materials due to its reaction with calcium hydroxide formed from calcium silicate (C 3 S and C 2 S) hydration. The pozzolanic reaction rate is not only proportional to the amount of amorphous silica but also to the surface area available for reaction. Subsequently, fine nano-Fe 2 O 3 and nano-SiO 2 particles in mortars are expected to improve mortar performance. The experimental results showed that the compressive strength of mortars with nano-Fe 2 O 3 and nano-SiO 2 particles were lower than those obtained with the reference mortar at seven and 28 days. It was shown that the nano-particles were not able to enhance mechanical strength on every occasion. The continuous microstructural progress monitored by mercury intrusion porosimetry (MIP) measurements, pore-size distribution (PSD), total porosity and critical pore diameter also confirmed such results.

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纳米sio2和纳米fe2o3对水泥砂浆抗压强度、抗折强度、孔隙率和电阻率的综合影响

研究了纳米氧化铁和纳米二氧化硅水泥砂浆的抗压强度、抗折强度、孔隙率和电阻率等性能。无定形二氧化硅与硅酸钙(c3s和c2s)水化形成的氢氧化钙反应，是火山灰材料的主要成分。火山灰的反应速率不仅与无定形二氧化硅的量成正比，而且与可用于反应的表面积成正比。随后，在砂浆中加入纳米fe2o3和纳米sio2颗粒有望改善砂浆性能。实验结果表明，在第7天和第28天，纳米氧化铁和纳米二氧化硅颗粒砂浆的抗压强度低于参考砂浆。结果表明，纳米颗粒并不能在任何情况下都能提高机械强度。通过压汞孔隙度(MIP)测量、孔隙尺寸分布(PSD)、总孔隙度和临界孔径监测的连续微观结构进展也证实了这一结果。

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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.