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Materials 2016, 9(4), 294; doi:10.3390/ma9040294

Ultrasonic Monitoring of Setting and Strength Development of Ultra-High-Performance Concrete

1
Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
2
Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 0C3, Canada
3
School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 22 March 2016 / Revised: 6 April 2016 / Accepted: 13 April 2016 / Published: 19 April 2016
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [2977 KB, uploaded 19 April 2016]   |  

Abstract

In this study, the setting and tensile strength development of ultra-high-performance concrete (UHPC) at a very early age was investigated by performing the penetration resistance test (ASTM C403), as well as the direct tensile test using the newly developed test apparatus, and taking ultrasonic pulse velocity (UPV) measurements. In order to determine the optimum surface treatment method for preventing rapid surface drying of UHPC, four different methods were examined: plastic sheet, curing cover, membrane-forming compound, and paraffin oil. Based on the test results, the use of paraffin oil was found to be the best choice for measuring the penetration resistance and the UPV, and attaching the plastic sheet to the exposed surface was considered to be a simple method for preventing the rapid surface drying of UHPC elements. An S-shaped tensile strength development at a very early age (before 24 h) was experimentally obtained, and it was predicted by a power function of UPV. Lastly, the addition of shrinkage-reducing and expansive admixtures resulted in more rapid development of penetration resistance and UPV of UHPC. View Full-Text
Keywords: ultra-high-performance concrete; setting property; early age tensile strength; ultrasonic pulse velocity; surface treatment ultra-high-performance concrete; setting property; early age tensile strength; ultrasonic pulse velocity; surface treatment
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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Yoo, D.-Y.; Shin, H.-O.; Yoon, Y.-S. Ultrasonic Monitoring of Setting and Strength Development of Ultra-High-Performance Concrete. Materials 2016, 9, 294.

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