Internal curing of high-performance concrete with pre-soaked fine lightweight aggregate for prevention of autogenous shrinkage cracking

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.cemconres. 2008.02.001 Cement and Concrete Research, 38, 6, pp. 757-765, 2008-06-01 Internal curing of high-performance concrete with pre-soaked lightweight aggregate sand for prevention of autogenous shrinkage cracking Cusson, D.; Hoogeveen, T. J.http://irc.nrc-cnrc.gc.caInternal curing of high-performance concrete with pre-soaked lightweight aggregate sand for prevention of autogenous shrinkage cracking NRCC-50026Cusson, D.; Hoogeveen, T.A version of this document is published in / Une version de ce document se trouve dans: Cement and Concrete Research, v. 38, no. 6, pp. 757-765 doi: 10.1016Research, v. 38, no. 6, pp. 757-765 doi: 10. /j.cemconres.2008 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. shown that the risk of concrete cracking could be conservatively estimated from the extent of free shrinkage strain occurring after the peak expansion strain that may develop at very early ages.Autogenous expansion, observed during the first day for high levels of internal curing, can significantly reduce the risk of cracking in concrete structures, as both the elastic and creep strains develop initially in compression, enabling the tensile strength to increase further before tensile stresses start to initiate later.

Influence of Curing Conditions on Properties of Normal and High Strength Concrete with and without Pre-Wetted Lightweight Aggregates

“…Moreover, in this experiment test series included: (i) NSC with a water-to-cement ratio (w/c) of 0.5; and (ii) HSC-1 mixed with FA and w/c= 0.35; (iii) HSC-2 mixed with pre-wetted LWAs and total w/c = 0.38. To be consistent with HSC-1 specimens without pre-wetted LWAs, the effective water-cement ratio of 0.35, which did not contain the water content in pre-wetted LWAs (Henkensiefken et al 2008;Cusson and Hoogeveen 2008), was thus used for the case of HSC-2 concrete.…”

Effects of Fine LWA and SAP as Internal Water Curing Agents

“…Several studies have dealt with the experimental evaluation of the influence of lightweight aggregates (LWA) on autogenous shrinkage. Most of them assessed the use of coarse aggregates, but more recently, the use of fine LWA and superabsorbent polymers (SAP) has been explored (Bentz and Snyder 2009;Bentur and van Breugel 2002;2007;Sahmaran et al 2009;Cusson and Hoogeven 2008;Nestle et al 2009;Craeye et al 2011;Akcay and Tasdemir 2010). This paper reviews for the first time the efficiency of the SAP and fine LWA approaches, and considers some of the theoretical aspects which should be taken into account to optimize their use for internal curing of HPC.…”

Improved Concrete Materials with Hydrogel-Based Internal Curing Agents

“…The ability to control the mechanical response, swelling response, shape [20], and size of the hydrogels could also lead to hydrogels imparting multiple benefits to concrete. Hydrogels can be added dry to the cement mixture and relatively small amounts have been proven effective in reducing shrinkage of HPC (usually less than 2% by weight of cement), which makes the hydrogels more attractive to use than pre-soaked lightweight aggregates [21,22].…”