Use of Triaxial Compression Test on Mortars to Evaluate Formwork Pressure of Self-Consolidating Concrete

To evaluate triaxial testing suitability to determine formwork pressure developed under both drained and undrained conditions by self-consolidating concrete (SCC), a comprehensive research project was undertaken. For ten concrete-equivalent mortar (CEM) mixtures made with various water-cementitious material ratios (w/cm) and binder types, there was determination of the cohesion (C) and angle of internal friction (Φ). Formwork pressure was determined using SCC and correlations were established with respect to thixotropy. Test results show that the drained and undrained conditions the tests are conducted under greatly affect CEM mixture cohesiveness. Higher C and lower Φ values were exhibited by mixtures made with ternary cement and/or lower w/cm in comparison to those made with binary or Type 1 cement, and those prepared with increased water content. Either thixotropy or C values can be used to predict SCC lateral pressure developed right after casting. The CEM triaxial approach was not appropriate, however, for pressure drop evaluation over time, given the absence of coarse aggregate, which underestimates internal friction development between solid particles.

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  • Authors:
    • Assaad, Joseph J
    • Harb, Jacques
    • Khayat, Kamal H
  • Publication Date: 2009


  • English

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  • Accession Number: 01142850
  • Record Type: Publication
  • Report/Paper Numbers: 106-M49
  • Files: TRIS
  • Created Date: Oct 14 2009 11:12AM