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Materials and Structures

, Volume 41, Issue 3, pp 559–569 | Cite as

Influence of the aggregate quality on the physical properties of natural feebly-hydraulic lime mortars

  • S. Pavía
  • B. Toomey
Original Article

Abstract

This paper examines the influence of the shape, average size and calcite content of the aggregate on strength, porosity, water absorption, density and capillary suction of natural feebly-hydraulic lime (NHL 2) mortars. Four types of aggregate were analysed in order to determine calcite content, particle shape and average particle size. Four different mortar mixes were then designed and produced using each of the aggregate types and NHL 2 as a binder. The mixing and curing as well as the aggregate:binder proportions were kept constant in order to attribute variation of mortar properties to the quality of the aggregate. The results suggest that an increase in the aggregate’s calcite content lowers the flexural and compressive strength of the mortar. This study also determined that sharp aggregate as well as aggregate with a small average particle size tends to increase the mechanical strength and bulk density of a mortar simultaneously reducing porosity, water absorption and capillary suction. Furthermore, this paper concludes that aggregates containing particles of a wide size range will also increase the mechanical strength and bulk density of the hardened mortar diminishing porosity, water absorption and capillary suction.

Keywords

Natural feebly-hydraulic lime Aggregate’s shape Size and calcite content Mortar strength Porosity Absorption Density Suction 

Résumé

Cet article étudie l’influence de la forme, de la taille moyenne, de la proportion en calcite des granulats sur la résistance, la porosité, l’absorption d’eau globale, l’absorption d’eau par capillarité et la densité de mortiers de chaux naturelle faiblement hydraulique (NHL 2). Quatre types de granulats ont été analysés en vue de déterminer leur teneur en calcite ainsi que la forme et la taille moyenne de leurs particules. Quatre mortiers différents ont été ensuite conçus et gâchés en utilisant chaque type de granulats et la chaux NHL 2 comme liant. Le temps de malaxage, les conditions de séchage et la proportion granulats:liant sont restés identiques au cours des différents essais de façon à attribuer à la seule qualité des granulats les différences de propriétés du mortier observées. Les résultats suggèrent qu’une augmentation de la teneur en calcite des granulats diminue la résistance en compression et en flexion du mortier. Cette étude établit aussi que des granulats anguleux, comme des granulats avec une taille moyenne de particule faible, ont tendance à augmenter la résistance mécanique et la masse volumique apparente d’un mortier réduisant simultanément sa porosité, son absorption d’eau globale et son absorption d’eau par capillarité. De plus, cet article conclut que des granulats contenant des particules à granulométrie étalée auront aussi tendance à augmenter la résistance mécanique et la masse volumique apparente du mortier durci diminuant sa porosité, son absorption d’eau globale et son absorption d’eau par capillarité.

Mots clé

Chaux naturelle faiblement hydraulique Forme Taille et teneur en calcite des granulats Résistance du mortier Porosité Absorption Masse volumique Capillarité 

Notes

Acknowledgements

Testing was carried out in the Laboratories of the Department of Civil, Structural and Environmental Engineering, Trinity College Dublin. The authors thank Mr. Chris O’Donovan, Chief Technician, for facilitating our laboratory work; Mr. Martin Carney for his help with testing in the Soils Laboratory; Mr. Eoin Dunne for his assistance with testing in the Materials Laboratory; Mr Patrick Veale for his chemical analyses and Mr. Dave McAuley for his assistance with the equipment. The authors also thank Mr. Nial Leddy of the Centre for Microscopy and Analysis, TCD, for his assisstance with the SEM/EDX analyses; Ms. Luice Chevert for translating the abstract and St Astier Limes, France, and The Traditional Lime Company, Ireland, for donating materials.

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Copyright information

© RILEM has copyright 2007

Authors and Affiliations

  1. 1.Department of Civil, Structural and Environmental EngineeringTrinity College DublinDublinIreland

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