valorisation du sable de concassage et du sable du désert dans la composition des bétons autoplaçants valorization of the crushed sand and of the desert sand in the composition of the self compacting concrete
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ID: 174255
2012
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Abstract
Les bétons autopla÷ants (BAP) sont des bétons très fluides qui demandent des dosages élevés en sables et en éléments fins par rapport au béton ordinaire (BO). Le sable de concassage (SC), à granularité étalée, est un sous-produit de concassage des roches massives. Le sable du désert (SD) est un sable extra-fin, caractérisé par une distribution serrée de grosseur des grains. Renfermant des teneurs importantes en fines, ces deux sables peuvent êtres des composants intéressants des BAP. Cette recherché consiste à incorporer le SC dans la composition des bétons et étudier l’effet de son remplacement progressif par le SD sur le comportement à l’état frais et durci des BAP. L’étude expérimentale montre que les paramètres d’ouvrabilité des BAP sont améliorés lorsque le SC est partiellement remplacé par le SD (< 30%). Cependant, à une teneur élevée en SD (> 30%), des quantités supplémentaires en eau et en superplastifiant sont nécessaires, pour répondre aux propriétés autopla÷antes. Les résistances mécaniques diminuent en ajoutant le SD au SC, mais elles atteignent des valeurs acceptables pour des dosages modérés en SD. Les performances des BAP sont nettement meilleures que celles des BO confectionnées avec les mêmes granulats. Les essais de spécification de la durabilité montrent que les coefficients d’absorption d’eau par capillarité et par immersion augmentent en ajoutant le SD au SC alors que le coefficient de perméabilité diminue.
Self-compacting concretes (SCC) are highly fluid concretes that require high proportions in sand and fine particles with respect to the ordinary concrete (OC). The crushed sand (CS), spread granulometry, is a by-product of crushing rock mass. The desert sand (DS) is an extra fine sand, characterized by a tight distribution of grain size. Containing significant levels of fine sand, these two sands can be both interesting components of the SCC. This research is to incorporate the CS in the composition of concrete and to study the effect of its gradual replacement by the DS on the behavior of the fresh and hardened SCC. The experimental study shows that parameters of SCC workability are improved when the SC is partially replaced by the DS (<30%). However, at high levels of DS (>30%), additional quantities of water and superplasticizer are necessary to meet the self-compacting properties. The mechanical strength decreases when adding DS to CS, but they are reaching acceptable values for DS in moderate proportioning. The performance of SCC is much better than those of OC using the same aggregates. Specification tests of durability show that the coefficients of water absorption by capillarity and by immersion increase when adding DS to CS, while the coefficient of permeability decreases.
Self-compacting concretes (SCC) are highly fluid concretes that require high proportions in sand and fine particles with respect to the ordinary concrete (OC). The crushed sand (CS), spread granulometry, is a by-product of crushing rock mass. The desert sand (DS) is an extra fine sand, characterized by a tight distribution of grain size. Containing significant levels of fine sand, these two sands can be both interesting components of the SCC. This research is to incorporate the CS in the composition of concrete and to study the effect of its gradual replacement by the DS on the behavior of the fresh and hardened SCC. The experimental study shows that parameters of SCC workability are improved when the SC is partially replaced by the DS (<30%). However, at high levels of DS (>30%), additional quantities of water and superplasticizer are necessary to meet the self-compacting properties. The mechanical strength decreases when adding DS to CS, but they are reaching acceptable values for DS in moderate proportioning. The performance of SCC is much better than those of OC using the same aggregates. Specification tests of durability show that the coefficients of water absorption by capillarity and by immersion increase when adding DS to CS, while the coefficient of permeability decreases.
| Reference Key |
a.2012matecvalorisation
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|---|---|
| Authors | ;R’mili A.;Ben Ouezdou M. |
| Journal | acta botânica brasílica |
| Year | 2012 |
| DOI |
10.1051/matecconf/20120201001
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