Cement and concrete research, Vol. 40 N° 4. Cement and concrete research - Avril 2010
| Titre : | Cement and concrete research, Vol. 40 N° 4. Cement and concrete research - Avril 2010 |
| Type de document : | Bulletin |
| Paru le : | 17/09/2012 |
Dépouillements
Article : texte imprimé
E. Grimal, Auteur
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Alkali aggregate reaction (AAR) affects numerous civil engineering structures and causes irreversible expansion and cracking. In order to control the safety level and the maintenance cost of its hydraulic dams, Electricité de France (EDF) must r[...]
Article : texte imprimé
Cyrille F. Dunant, Auteur ;
Karen L. Scrivenerb, Auteur
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AMIE, a finite element/extended finite element framework, has been designed to provide the tools to run detailed microstructural simulations; this paper demonstrates the possibility of simulating the mechanisms underlying the alkali–silica-react[...]
Article : texte imprimé
Attempts to model ASR expansion are usually limited by the difficulty of taking into account the heterogeneous nature and size range of reactive aggregates. This work is a part of an overall project aimed at developing models to predict the pote[...]
Article : texte imprimé
D. Bulteel, Auteur ;
E. Garcia-Diaz, Auteur ;
P. Dégrugilliers, Auteur
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Several papers show that the use of lithium limits the development of alkali–silica reaction (ASR) in concrete. The aim of this study is to improve the understanding of lithium's role on the alteration mechanism of ASR.
The approach used is a[...]
Article : texte imprimé
Siliceous limestone aggregates have “pessimum” behaviours similar to those observed for pure siliceous aggregates such as flint or opal. For high alkali contents concretes based on fine and coarse reactive siliceous limestone aggregates swell le[...]
Article : texte imprimé
Expansions due to alkali–silica reaction (ASR) in the accelerated concrete prism test (ACPT–60 °C) show a significant reduction at 13 weeks compared to 52 week testing in the standard concrete prism test (CPT–38 °C). Previous work indicated that[...]
Article : texte imprimé
The mechanism of the alkali–carbonate reaction (ACR) has been recognized as being different from that of the more common alkali–silica reaction (ASR). However, the identification of alkali–silica gel in ACR concrete from Cornwall, Ontario, Canad[...]
Article : texte imprimé
A. Shayan, Auteur
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Recently, AAR was identified in submerged piles of some bridges in tidal waters. Microstructural examination detected chloroaluminate salts in some cracks. To clarify whether seawater had influenced the deterioration an experimental program was [...]
Article : texte imprimé
Medhat H. Shehata, Auteur ;
Michael D.A. Thomas, Auteur
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This paper presents results covering the effects of alkali content of Portland cement (PC) on expansion of concrete containing reactive aggregates and supplementary cementing materials (SCM). The results showed that the alkali content of PC has [...]
Article : texte imprimé
Reactivity of reclaimed concrete aggregate produced from concrete affected by alkali–silica reaction
This paper presents results from a research program that focused on studying the reactivity of reclaimed concrete aggregate (RCA) produced from concrete affected by alkali–silica reaction (ASR). The results showed that RCA produced from ASR-affe[...]
Article : texte imprimé
Various series of experiments were carried out on cements pastes, concretes made with a variety of reactive aggregates, composite specimens made of cement paste and reactive aggregate particles, and a variety of reactive natural aggregates and m[...]
Article : texte imprimé
This work presents the results of an experimental research concerning the use of fibers in mortar specimens subjected to alkali-aggregate reaction (AAR). Two types of steel fibers (0.16 mm diameter and 6.0 mm length, and 0.20 mm diameter and 13.[...]
Article : texte imprimé
Mactaquac Generating Station was constructed in the mid 1960's and is located in the province of New Brunswick in Eastern Canada. The effect of ASR expansion on the concrete structures of the station were first noticed approximately 10 years aft[...]
Article : texte imprimé
This paper presents the main findings in the EU PARTNER Project (2002–2006) providing the basis for a unified European test approach for evaluating the potential alkali-reactivity of aggregates. The project evaluated the tests developed by RILEM[...]
Article : texte imprimé
X. Feng, Auteur
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This paper summarizes findings from a research study conducted at the University of New Brunswick in collaboration with the University of Texas at Austin, and CANMET-MTL, on the effect of LiNO3 on ASR in new concrete. The studies included expans[...]
Article : texte imprimé
Typical examples of so-called alkali-carbonate reaction (ACR) in the Canadian field concretes in Ontario, CSA concrete prism, RILEM concrete microbars and RILEM mortar bar containing Pittsburg aggregate, were examined petrographically based on p[...]
Article : texte imprimé
Relevant and effective instruments and techniques must be selected for monitoring hydraulic structures affected by Alkali-Silica Reaction (“ASR”). A program aiming at assessing the condition of a hydraulic structure affected by ASR is presented [...]
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