The positive and negative influences of VMA's on the robustness of fresh self-compacting concrete

The positive and negative influences of VMA's on the robustness of fresh self-compacting concrete

Van der Vurst, F.
Grunewald, S.
De Schutter, G.

Civil Engineering and Geosciences

Structural Engineering

2015-12-31

Over time, several mix design metliods liave been developed to obtain a selfcompacting concrete (SCC) with suitable fresh and hardened concrete properties. The very fluid concrete with no need for external compaction is achieved by using a higher powder content and the use of chemical admixtures. Segregation and bleeding are prevented by either an appropriate yield stress, a high plastic viscosity, or intermediate values of both (assuming the Bingham model). To avoid rejection of batches, it is important for an SCC to have a sufficient robustness: the ability to withstand small variations in the mix proportions, material properties, and methods of casting. This experimental study examined the effect of two VMA's with different working mechanisms on the robustness of SCC mixtures. The influence of attapulgite clay, diutan gum, and no VMA addition on the robustness of the slump flow, V-funnel time, sieve stability, and rheological parameters of a SCC mixture stabilized by a relatively high yield stress and a SCC mixture stabilized by a high plastic viscosity is studied in this experimental program.

http://resolver.tudelft.nl/uuid:f3878966-cfef-4b39-9870-92fabec31da2

F.A. Finger Institut fur Bouwstoffkunde

978-3-00-050225-5

Proceedings of the 19. internationale Baustofftagung, 19. Ibausil, Weimar (Germany), 16-18 Sept. 2015; Authors version

Institutional Repository

conference paper

(c) 2015 The Authors