Reactivity of Mineral Additions in Autoclaved UHPC

Title: Reactivity of Mineral Additions in Autoclaved UHPC
Author(s): P. Fontana, C. Lehmann, U. Müller, B. Meng
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 69 - 77
Total Pages: 9
Nb references: 14
Language: English

Abstract: Autoclaving of UHPC has a significant influence on its micro structure and its mechanical properties. It generally leads to enhanced cement hydration and accelerated pozzolanic reactions forming crystalline CSH. Quartz fillers are added usually to UHPC in order to optimise the particle size distribution and may improve the mechanical properties of UHPC by partial reaction and thus enhanced cohesion to the cement paste when autoclaving is applied. In the first part of our study we added secondary cementitious materials to the UHPC in order to reduce the very high amounts of cement and silica fume commonly used in UHPC. Due to the autoclaving these materials were activated to a large extent and contributed to the hydration process by significant reactivity. In the second part of our study we replaced the quartz filler by recycled industrial waste materials in order to compare their reactivity and their contribution to structural changes during autoclaving. The results showed that the reactivity of the fillers has a strong influence on the strength properties of autoclaved UHPC.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00