EFFECT OF LOW PRESSURE ON THE PROPERTIES AND MICROSTRUCTURE OF ULTRA-HIGH PERFORMANCE CONCRETE

The properties of fresh concrete, the mechanical properties and microstructure of Ultra-High Performance Concrete (UHPC) with different admixtures were studied in Chengdu and Lhasa, for exploring the influence of low pressure on the performance of UHPC. The test results indicated that: The plateau l...

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Bibliographic Details
Published inCeramics (Praha) Vol. 65; no. 4; pp. 395 - 400
Main Author Wu, Xiong
Format Journal Article
LanguageEnglish
Published University of Chemistry and Technology, Prague 01.01.2021
Subjects
mechanical properties
microstructure
plateau low pressure environment
properties of fresh concrete
uhpc
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Summary:The properties of fresh concrete, the mechanical properties and microstructure of Ultra-High Performance Concrete (UHPC) with different admixtures were studied in Chengdu and Lhasa, for exploring the influence of low pressure on the performance of UHPC. The test results indicated that: The plateau low pressure environment can significantly reduce the dosage of the admixtures and improve the performance of fresh UHPC, but the compressive strength was significantly reduced at 28 d and 60 d. The porosity and average pore size of the UHPC under low pressure are relatively small, but the pore size of the UHPC above 10000 nm takes up a larger proportion. In addition, the low pressure environment on the plateau can also reduce the degree of hydration of the UHPC.
ISSN:0862-5468
1804-5847
DOI:10.13168/cs.2021.0042