Possibilities for improving the properties of UHPC by means of thermal treatment

Author(s) : C. Snelleng, S. Simon, P. Fontana, B. Meng
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. ResplendinoT.Ch.
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 83 - 92
Total Pages : 10
Language : English

Abstract: A further improvement of the excellent properties of UHPC can be realized with thermal treatment. Like for normal concrete, it accelerates the hardening and prevents shrinkage after the treatment. Additionally, an increase in strength can be achieved. Aim of this study was the optimisation of the thermal treatment conditions of UHPC for very different treatment methods; heat treatment at 90 °C for unprotected and sealed samples, hot water bath at 90 °C and hydrothermal treatment at 185 °C/1.1 MPa. The pre-storage time and the dwell time were systematically varied for each method to gain a higher strength. The compressive strength depends on the manner of treatment at which higher water accessibility leads to higher strengths. The phase composition changes considerably with different treatment temperatures. Finally, it can activate unhydrated binder components forming additional C-S-H, leading to higher strength.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00