Mercury intrusion porosimetry of concrete aggregates
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Abstract
Mercury intrusion porosimetry was performed for aggregates used for concrete in Kuwait. The curves which were established helped to identify the types of rocks used. Microstructural flows in the form of pores whose diameter is larger than 100 nm were associated with certain identifiable rocks. Such pores are considered as a source of weakness for concrete and as a factor which adversely affects its durability.
Keywords
Pore Size Distribution Coarse Aggregate Kuwait Mercury Intrusion Porosimetry Concrete AggregateRésumé
On a effectué des measures au porosimètre à mercure sur des specimens de roches et de sable utilisés au Kowait pour la fabrication du béton. Les courbes obtenues ont permis d’identifier des caractéristiques de distribution dimensionnelle des roches. Il s’est révélé que le sable et le mortier agglomérés contenaient plus de 26% de pores en volume, et, sur ce pourcentage, plus de 80% présentaient un diamètre supérieur à 100 nm. La rhyolite et le quartz, malgré une porosité totale nettement inférieure, contiennent une quantité importante de pores dont le diamètre est supérieur à 100 nm. L’auteur pense que l’inclusion dans le béton de ces agglomérats de sable et de gravier, par rapport à la pâte de ciment durcie, déterminent des champs de contraintes intensifiés. Les pores dont le diamètre est supérieur à 100 nm, qui se trouvent dans ce type de roches et dans la rhyolite et le quartz, favorisent la diffusion d’ions chlorure, ce qui affaiblit la durabilité du béton.
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