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Impacts of Low Atmospheric Pressure on Properties of Cement Concrete in Plateau Areas: A Literature Review

1, 1,2,*, 1,2,* and 1,2
1
School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
2
Engineering Research Center of Pavement Materials, Ministry of Education of P.R. China, Chang’an University, Xi’an 710064, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(9), 1384; https://doi.org/10.3390/ma12091384
Received: 10 March 2019 / Revised: 3 April 2019 / Accepted: 23 April 2019 / Published: 28 April 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

Low atmospheric pressure (LAP) can enormously affect properties of cement concrete in plateau areas. There are fewer studies and attendances on this issue than those of cement concrete in normal atmospheric pressure (AP), because of the limitations of both environmental conditions and instruments. In order to improve properties of cement concrete under LAP, influences of LAP on properties of cement concrete were reviewed in this work. The influence rules and mechanism on properties of cement concrete were summarized. The corresponding mechanism and techniques were put forward for enhancing the properties of cement concrete. The results of researchers show that LAP can significantly reduce the air entraining ability of the air entraining agent (AEA). Air content in concrete linearly decreases with the decrease of AP when other conditions are constant. If the initial air content is high, the decrease rate of air content increases with the decrease of AP. When the initial air content in cement concretes is similar, the greater the slump of cement concrete, the stronger its resistance to the decrease of air content caused by the decrease of AP. In addition, the condition of the bubble characteristics of hardened cement concrete under LAP is worse than that under normal AP. Therefore, the change of concrete properties under LAP is mainly attributed to these bubble characteristics, such as air content, bubble spacing coefficient, bubble radius and bubble specific surface area. In this work, nano-silica (negative charges) with cationic oligomeric surfactants is recommended as a new type of AEA to optimize the bubble characteristics under LAP in plateau areas. View Full-Text
Keywords: plateau areas; low atmospheric pressure (LAP); properties of cement concrete; air entraining agent (AEA); bubble characteristics; improvement techniques plateau areas; low atmospheric pressure (LAP); properties of cement concrete; air entraining agent (AEA); bubble characteristics; improvement techniques
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Huo, J.; Wang, Z.; Chen, H.; He, R. Impacts of Low Atmospheric Pressure on Properties of Cement Concrete in Plateau Areas: A Literature Review. Materials 2019, 12, 1384.

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