Journal
MATERIALS
Volume 9, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ma9040294
Keywords
ultra-high-performance concrete; setting property; early age tensile strength; ultrasonic pulse velocity; surface treatment
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Funding
- Smart Civil Infrastructure Research Program - Ministry of Land, Infrastructure and Transport (MOLIT) of Korea government [13SCIPA01]
- Korea Agency for Infrastructure Technology Advancement (KAIA)
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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.
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