Design of concrete for high flowability: Progress report of fib task group 4.3

Design of concrete for high flowability: Progress report of fib task group 4.3

Schmidt, W.
Grunewald, S.
Ferrara, L.
Dehn, F.

Civil Engineering and Geosciences

2015-05-18

Flowable concretes can differ significantly from traditional vibrated concrete. Concrete types like selfcompacting concrete (SCC), ultra-high performance concrete (UHPC) and high performance fibre reinforced cementitious composites (HPFRCCs) require novel mix design approaches. This has consequences for the production and the performance in the hardened state. Mix designs for flowable concretes can incorporate a wide variety of innovative admixtures or components: e.g. superplasticisers increase the flowability and allow for significant reduction of the water content, shrinkage compensating admixtures or superabsorbent polymers support sound and damage free curing processes, viscosity modifying admixtures enhance the robustness, and new fibre types allow for sophisticated and tailored structural performance. The new Model Code has limitations regarding the application of flowable concrete, e.g. thresholds for the minimum aggregate size and the maximum strength. Provisions are added to include fibres for structural design. fib Task Group 4.3 aims at facilitating the use of innovative flowable materials for designing concrete structures and considers three aspects of flowable concrete: material properties, production effects and structural boundary conditions and performance. This paper reports about the progress of fib TG 4.3 related to the mix design of flowable concrete and discusses the present stateof-the art concerning admixtures and robustness.

admixtures
fib Model Code
fibres
flowable concrete
mix design
robustness

http://resolver.tudelft.nl/uuid:3e39ca31-bfdd-4716-9be4-c55d7f2295b2

Federation International du Beton

fib Symposium 2015: Concrete - Innovation and Design, Copenhagen, Denmark, 18-20 May 2015

Institutional Repository

conference paper

(c) 2015 The author(s)