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Regression models to predict SCC pressure exerted on formworks containing vertical and transverse reinforcing bars

Regression models to predict SCC pressure exerted on formworks containing vertical and transverse... The use of self-consolidating concrete (SCC) containing recycled concrete aggregate (RCA) considerably increased in sustainable structural applications and civil engineering works. However, current literature and construction practices are not clear regarding the influence of RCA additions and presence of steel reinforcement on formwork pressure exerted by the plastic concrete. This paper reports experimental data obtained from 32 SCC mixtures possessing different stability levels and cast in 1.6-m high formwork containing various combinations of vertical and transverse steel bars. Test results have shown that mixtures incorporating recycled aggregates exhibited reduced initial maximum pressure, given the higher RCA surface roughness that promotes internal friction and material build-up at rest. The decrease in pressure was particularly accentuated in presence of steel bars, suggesting that the reinforcement cage confines the plastic concrete and carries part of its load. The transverse steel was around 1.5-times more influential than vertical steel in reducing the formwork pressure. The rates of pressure drop over time were not altered because of steel, implying that pressure decay is governed by the concrete intrinsic properties such as thixotropy, RCA friction, and cement hydration. Special emphasis was placed to develop regression models and examine suitability of existing ones to predict lateral pressure of RCA-modified SCC cast in formworks containing reinforcing bars. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials and Structures Springer Journals

Regression models to predict SCC pressure exerted on formworks containing vertical and transverse reinforcing bars

Assaad, Joseph; Matar, Pierre
Materials and Structures , Volume 51 (3) – May 4, 2018
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References (33)

Publisher
Springer Journals
Copyright
Copyright © 2018 by RILEM
Subject
Engineering; Structural Mechanics; Materials Science, general; Theoretical and Applied Mechanics; Operating Procedures, Materials Treatment; Civil Engineering; Building Materials
ISSN
1359-5997
eISSN
1871-6873
DOI
10.1617/s11527-018-1188-x
Publisher site
See Article on Publisher Site

Abstract

The use of self-consolidating concrete (SCC) containing recycled concrete aggregate (RCA) considerably increased in sustainable structural applications and civil engineering works. However, current literature and construction practices are not clear regarding the influence of RCA additions and presence of steel reinforcement on formwork pressure exerted by the plastic concrete. This paper reports experimental data obtained from 32 SCC mixtures possessing different stability levels and cast in 1.6-m high formwork containing various combinations of vertical and transverse steel bars. Test results have shown that mixtures incorporating recycled aggregates exhibited reduced initial maximum pressure, given the higher RCA surface roughness that promotes internal friction and material build-up at rest. The decrease in pressure was particularly accentuated in presence of steel bars, suggesting that the reinforcement cage confines the plastic concrete and carries part of its load. The transverse steel was around 1.5-times more influential than vertical steel in reducing the formwork pressure. The rates of pressure drop over time were not altered because of steel, implying that pressure decay is governed by the concrete intrinsic properties such as thixotropy, RCA friction, and cement hydration. Special emphasis was placed to develop regression models and examine suitability of existing ones to predict lateral pressure of RCA-modified SCC cast in formworks containing reinforcing bars.

Journal

Materials and Structures – Springer Journals

Published: May 4, 2018

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