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Can vacuum mixing replace heat curing in UHPFRC?



Author(s): J. Dils, V. Boel, G. De Schutter
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 739 – 748
Total Pages: 10
Language: English


Abstract: 
In order to obtain the full capacity of cementitious materials incorporated in ultra-high performance fibre-reinforced concrete (UHPFRC) a heat curing can be applied. This method represents a high cost for the manufacturer. Therefore other techniques that increase the mechanical performance are interesting. Vacuum mixing is a new technology that can improve the compressive strength of such mixtures. Research is necessary to check whether it can replace the expensive heat treatment. We compared both techniques for several mixtures. This paper reports the effect of vacuum mixing on the compressive strength and splitting tensile strength of UHPFRC. First the effect of vacuum mixing on the compressive strength of ultra-high performance concrete was tested and compared with heat cured specimens. Next, two mixtures were chosen to incorporate different types of fibres. The effect of vacuum mixing on the splitting tensile strength was investigated. In conclusion, vacuum mixing improves the mechanical performance. Nevertheless, this new technique is not able to fully replace a heat treatment, based on the compressive strength. Further research should be done to examine the effect of vacuum mixing on the post-cracking behaviour of UHPFRC.


Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00