Development of low-shrinkage high-performance concrete with improved durability

The main goal of this study is to develop low-shrinkage high-performance concrete in order to reduce early age cracking and premature reinforcement corrosion, and to provide long service lives to concrete structures. This paper presents a summary of the results related to the evaluation of the chemical, mechanical, and durability properties of different formulations of normal-density, air-entrained high-performance concrete with a water-cement ratio of 0.35. The effectiveness of two shrinkage reduction measures is evaluated: internal curing with saturated lightweight aggregate, and a shrinkage-reducing admixture. All high-performance concretes developed in this study that used internal curing or a shrinkage reducing admixture (separately or in combination) successfully met all performance requirements in terms of workability, hydration characteristics, volume stability, strength and potential durability under severe exposure conditions simulated in the laboratory.Cette \ue9tude avait pour objectif principal la mise au point d?un b\ue9ton \ue0 hautes performances (BHP) \ue0 faible retrait dans le but de r\ue9duire la fissuration aux jeunes \ue2ges et la corrosion pr\ue9matur\ue9e des armatures, et de procurer aux structures de b\ue9ton une longue vie utile. Nous pr\ue9sentons dans ce document un r\ue9sum\ue9 des r\ue9sultats rattach\ue9s \ue0 l?\ue9valuation des propri\ue9t\ue9s chimiques, m\ue9caniques et de durabilit\ue9 de diff\ue9rentes formulations de BHP \ue0 air occlus, \ue0 granulat de densit\ue9 normale, ayant un rapport eau de g\ue2chage/ciment de 0,35. L?efficacit\ue9 de deux (2) mesures de la r\ue9duction du retrait est \ue9valu\ue9e : cure interne avec granulat l\ue9ger satur\ue9, et adjuvant r\ue9duisant le retrait. Tous les BHP mis au point dans le cadre de cette \ue9tude, qui utilisaient la cure interne ou un adjuvant r\ue9duisant le retrait (soit s\ue9par\ue9ment, soit de fa\ue7on combin\ue9e) ont satisfait \ue0 toutes les exigences de performance en termes d?ouvrabilit\ue9, de caract\ue9ristiques d?hydratation, de stabilit\ue9 volumique, de r\ue9sistance m\ue9canique et de durabilit\ue9 potentielle en conditions d?exposition rigoureuses telles que simul\ue9es en laboratoire.Peer reviewed: YesNRC publication: Ye