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• W2940829312 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." @default.
• W2940829312 created "2019-05-03" @default.
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• W2940829312 date "2019-04-28" @default.
• W2940829312 modified "2023-10-13" @default.
• W2940829312 title "Impacts of Low Atmospheric Pressure on Properties of Cement Concrete in Plateau Areas: A Literature Review" @default.
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• W2940829312 doi "https://doi.org/10.3390/ma12091384" @default.
• W2940829312 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6539586" @default.
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• W2940829312 hasPublicationYear "2019" @default.
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