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Progress to understand influence of reinforcement density on SCC lateral pressure

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Abstract

In addition to material properties, casting conditions, and formwork characteristics, presence and density of reinforcing bars can play a role on the resulting lateral pressure exerted by self-consolidating concrete (SCC) on formwork system. The effect of density of vertical reinforcement and spacing between reinforcing steel and formwork surface (concrete cover) on SCC lateral pressure were investigated in this study using laboratory-scale columns measuring 1.4 m in height. The effect of casting rate and concrete structural build-up at rest were also considered. A model was proposed to estimate SCC lateral pressure taking into consideration reinforcement density and concrete cover. A 6-m high column cast as part of field experimental study was used to validate the laboratory results. The results showed that the increase in steel reinforcement density placed at relatively small cover of 25 mm can reduce the maximum lateral pressure. At casting depth of 3 m and a concrete cover of 25 mm, increasing the reinforcement density from 0.5 to 4%, can reduce lateral pressure from 4 to 22%. The lateral pressure reduction is less significant when concrete cover increases to 50 mm or at deeper casting depths. A 2–17% pressure reductions for the 50-mm concrete cover, and 1–7% for the 5-m casting depth can be estimated. Based on the obtained results, a factor accounting for lateral pressure reduction due to the inclusion of vertical reinforcement was introduced in the pressure prediction models proposed by Khayat and Omran (State-of-the-art review of form pressure exerted by self-consolidating concrete, 2. http://www.concretesdc.org/projects/SCCreport.htm).

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Authors and Affiliations

  1. Department of Civil Engineering, University of Sherbrooke, 2500 Blvd. de l’Université, Sherbrooke (QC), J1K2R1, Canada

    Ahmed F. Omran

  2. University of Minoufiya, Shebin Elkom, Minoufiya, Egypt

    Ahmed F. Omran

  3. Missouri University of Science and Technology, 224 Engineering Research Laboratory, 500 W. 16th St., Rolla, 65409-0710, MO, USA

    Kamal H. Khayat

Authors
  1. Ahmed F. Omran
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  2. Kamal H. Khayat
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Correspondence to Ahmed F. Omran.

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Conflict of interest

This study was funded by NSERC Canada through the industrial NSERC Chair awarded to Prof. Kamal Khayat at University of Sherbrooke in Canada. The authors are grateful for Ellis-Don Construction, Canada Building Materials (CBM), and their collaborative agencies who carried out the “SCC under Pressure Research Program” project.

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Omran, A.F., Khayat, K.H. Progress to understand influence of reinforcement density on SCC lateral pressure. Mater Struct 50, 152 (2017). https://doi.org/10.1617/s11527-017-1022-x

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