RILEM has developed a testing and specification system to minimise AAR damage risk in new concrete structures. A performance test is being developed for particular mixes, usable on a project-specific basis; the challenge is proving a consistent relationship between test and field behaviours. Long-service structures, including dams, can sometimes ex...
Alkali Aggregate Reaction (AAR) and Delayed Ettringite Formation (DEF) cause expansion of the affected concrete that generally leads to cracking and decrease of its mechanical properties. As a consequence, these pathologies raise severe problems in terms of serviceability, sustainable operation of the concrete works and structural integrity. To man...
The guidance made by a working group of the RILEM Committee TC 219 is dealing with the appraisal and management of structures damaged by AAR. This document is organized in four main chapters : a chapter on the effects of AAR on material and properties, a chapter from diagnosis to appraisal of residual structural capacity, a chapter devoted to the p...
RILEM has developed a testing and specification system to minimise AAR damage risk in new concrete structures. A performance test is being developed for particular mixes, usable on a project-specific basis; the challenge is proving a consistent relationship between test and field behaviours. Long-service structures, including dams, can sometimes ex...
This paper presents the ongoing study of a gravity dam affected by alkali-silica reaction (ASR) and the strategy planned for its rehabilitation. The aim is to lower its stress-state by slot-cutting. The position and number of these slot cuttings will be determined by use of numerical modelling. The first steps of the study are described: analysis o...
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This communication describes a case-study concerning a real hydraulic power-plant affected by AAR. The displacements imposed to the sensitive equipments (pumps, turbines, pipes) are difficult to predict due to the complexity of the structure and to strongly heterogeneous moisture distribution. Hence the prediction of serviceability and the managing...
Ce document décrit le développement d'une approche performantielle, globale et prédictive de la durabilité des structures en béton (armé), fondée sur la notion d'indicateurs de durabilité, et combinant mesures en laboratoire et simulations numériques. Des exemples significatifs sont présentés, relativement aux fondements scientifiques de cette appr...
