ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 65, (4) 395 - 400 (2021)


EFFECT OF LOW PRESSURE ON THE PROPERTIES AND MICROSTRUCTURE OF ULTRA-HIGH PERFORMANCE CONCRETE
 
Wu Xiong 1,2, Yang Wen 2, Luo Yaoling 2, Yan Xinyi 2, Xie Yuhao 2
 
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2 China West Construction Academy of Building Materials, Chengdu, 610015, China.

Keywords: UHPC, Plateau Low Pressure Environment, Properties of fresh concrete, Mechanical properties, Microstructure
 

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.


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doi: 10.13168/cs.2021.0042
 
 
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