UHPC mit alternativen Zusatzstoffen - Rheologie und Faserverbund

UHPC Made with Alternative Additions - Rheology and Fibre Bonding

The effect of additions on the production of UHPC and its rheological and mechanical properties was investigated. Quartz, limestone and granulated blast-furnace slag flour as well as two silica fumes were used. The additions affected significantly mixing time and amount of superplasticizer needed to achieve target flowability. A pronounced affect of the additions on the rheological properties relevant to practical application was also observed. Silica fume with low specific surface and limestone flour proved to be the most favourable additions. Regarding the mechanical properties, no appreciable effect of the additions was observed on, in particular, fibre bonding and flexural strength of fibre reinforced concretes. Thus additions replacement is unproblematic from a mechanical point of view.