Simulation of hydration process and microstructure development of UHPC paste containing fly ash and silica fume

Author(s): C. Gu, G. Ye, W. Sun
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: 767 – 776
Total Pages: 10
Language: English

Abstract: 
Ultra-high performance concrete (UHPC) is attractive for infrastructure constructions in the future because of its superior properties. Ternary cementitious system containing fly ash and silica fume has been widely adopted for UHPC mix design. This paper presents a numerical model for the simulation of the hydration process and the microstructure development of UHPC paste containing fly ash and silica fume. In the numerical simulation, both the filler effect and pozzolanic reaction of fly ash and silica fume were considered, as well as the nucleating effect of fly ash and silica fume on the hydration process of cement in the early age. The simulated results were discussed and validated against the experimental data. The simulated microstructure and pore structure of UHPC paste were presented. It can be concluded that the UHPC paste containing fly ash and silica fume is extremely dense, which results in the excellent properties of UHPC.

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