Effects of a clay additive on the properties of no-slump concrete

  • Harald Budelmann
  • Karim Hariri
  • Hans-Werner Krauss
  • Tim Malonn
Conference paper

Abstract

The strength of no-slump concrete is mainly achieved by a high particle packing density (ppd), which causes a strong interlocking of the coarse aggregates. Also inert fillers like fly ash are enhancing the strength by help of interlocking of micro-sized particles (Bornemann 2005). Both the compressive strength in the green and hardened state is enhanced. However, additional water or liquifier is needed to keep a sufficient workability. Accordingly there’s often a lack of water for the cement hydration process, that is either retained by the filler or is replaced by high superplasticizer content. Anyway there is a discrepancy to be noted between high green strength (little water needed) and high compression strength of hardened concrete (more water needed). The stickiness of a filler-optimized mixture causes hindrances in manufacturing, yet another problem. Another theory, wherein green strength is explained by capillary forces between micro-sized particles (Wierig 1972) seems to fail. Capillary forces have a maximum effect on particles with diameters from 0.1-1 mm, while friction forces are dominant when particle diameters exceed 1 mm (Bornemann 2005).

Keywords

Compressive Strength Cement Paste Pore Solution Cement Particle DLVO Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Harald Budelmann
    • 1
  • Karim Hariri
    • 1
  • Hans-Werner Krauss
    • 1
  • Tim Malonn
    • 1
  1. 1.Institute of Building Materials, Concrete Construction and Fire ProtectionTechnical University BraunschweigGermany

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