The role of aggregates on the structure and properties of lime mortars

Stefanidou, Maria; Papayianni, I.

doi:10.1016/j.cemconcomp.2005.05.001

Cited by 111 publications

(53 citation statements)

References 2 publications

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“…in this research, the limestone sand tested is chalk, a calcitic rock of low mechanical strength). Finally, agreeing with former authors [9,13], this paper concludes that an aggregate with a small average particle size will also enhance mechanical strength and bulk density of a lime mortar simultaneously lowering its porosity, water absorption and capillary suction. In general, an increase of water absorption, capillary suction, porosity and bulk density is coupled to a raise in mortar permeability which enhances salt, moisture and frost induced damage subsequently undermining mortar durability.…”

Section: Resultssupporting

confidence: 54%

“…According to Lanas et al [6] mortar strength increases with the use of a small grain sized aggregate and decreases with the use of rounded aggregate as the latter enhances mortar's porosity. Finally, Stefanidou et al [13] studied the effect of particle size distribution, compaction and binder/ aggregate ratio on capillary suction, strength development and volume change of air lime mortar, concluding that both water absorption and capillary suction increase with increasing grain size, and that the mortars with the highest strength values were those prepared with aggregate particles ranging between 0 and 4 mm.…”

Section: Introductionmentioning

confidence: 99%

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

Pavía

Toomey

2007

Mater Struct

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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 feeblyhydraulic 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.Résumé Cet article e´tudie l'influence de la forme, de la taille moyenne, de la proportion en calcite des granulats sur la re´sistance, la porosite´, l'absorption d'eau globale, l'absorption d'eau par capillarite´et la densite´de mortiers de chaux naturelle faiblement hydraulique (NHL 2). Quatre types de granulats ont e´te´analyse´s en vue de de´terminer leur teneur en calcite ainsi que la forme et la taille moyenne de leurs particules. Quatre mortiers diffe´rents ont e´teé nsuite conçus et gaˆche´s en utilisant chaque type de granulats et la chaux NHL 2 comme liant. Le temps de malaxage, les conditions de se´chage et la proportion granulats:liant sont reste´s identiques au cours des diffe´rents essais de façon a`attribuer a`la seule qualite´des granulats les diffe´rences de proprie´te´s du mortier observe´es. Les re´sultats sugge`rent qu'une augmentation de la teneur en calcite des granulats diminue la re´sistance en compression et en flexion du mortier. Cette e´tude e´tablit aussi que des granulats anguleux, comme des granulats avec une taille moyenne de particule faible, ont tendance aà ugmenter la re´sistance me´canique et la masse volumique apparente d'un mortier re´duisant simultane´ment sa porosite´, son absorption d'eau globale et son absorption d'eau par capillarite´. De plus, cet article conclut que des granulats contenant des particules a`granulome´trie e´tale´e auront aussi tendance a`augmenter la re´sistance me´canique et la masse volumique apparente du mortier durci diminuant sa porosite´, son absorption d'eau globale et son absorption d'eau par capillarite´.

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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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

Pavía

Toomey

2007

Mater Struct

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“…Furthermore, they have been widely used in modern work with decorative and protective purposes (renders and facades) [6,7]. Both uses require the mortars to be durable, especially when they are directly exposed to environmental conditions, as their performance and aesthetic characteristics could become affected [6,8].…”

Section: Introductionmentioning

confidence: 99%

“…The extent to which a mortar is affected by these deterioration factors is a function of the mortar's properties, which depend, in turn, on several issues, such as the kind and characteristics of the binder and the aggregate, the binder/aggregate ratio, the amount of mixing water, the mortar's permeability [9][10][11][12], the water absorption capacity through capillarity [10,13], water intake [7,14,15], the presence of admixtures and the curing conditions [16][17][18]. SO 2 exposure is supposed to affect the mortars because gaseous SO 2 has been widely reported to react with calcium carbonate, giving rise to the formation of both calcium sulphite hemihydrate (CaSO 3 .1/2H 2 O) and calcium sulphate dihydrate (CaSO 4 ·2H 2 O) on the mortar's surfaces [6,8,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Ageing of lime mortars with admixtures: Durability and strength assessment

Izaguirre

Lanas²,

Álvarez

2010

Cement and Concrete Research

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Lime-based mortars modified with admixtures were prepared and subjected to different environments such as outdoor and indoor exposures, climatic chamber, SO 2 -chamber, and freezing-thawing cycles. The influence that the different admixtures (water repellents, water retainers, polypropylene fibre and a viscosity modifier) had on the pore size distribution of the hardened specimens was assessed and related to the water absorption capacity, and hence to the durability. Ageing resistance and mechanical strengths improved when additives reduced the water intake and increased the aircontent. High dosages of water repellents were necessary to enhance the durability, sodium oleate being the most effective additive to endure freezing processes. Also the low tested dosage of fibre, a water retainer (guar gum derivative), and a starch proved to be useful. SO 2 deposition caused the formation of calcium sulphite hemihydrate as the main degradation product. A very small amount of calcium sulphate dihydrate was observed. A crystal habit composed of acicular agglomerates of calcium sulphite hemihydrate was detected in SO 2 deposition on calcareous materials.3

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“…In mortars, the most common aggregate to binder ratio encountered in the literature is 3:1 by weight (Stefanidou and Papayianni 2005). Inevitably, the characteristics and quality of aggregates have an effect on the long-term performance of the aforementioned composite materials.…”

Section: Introductionmentioning

confidence: 99%

A Study of Fine Aggregate Properties and Their Effect on the Quality of Cementitious Composite Materials

Fournari

Ioannou

Vatyliotis

2014

Engineering Geology for Society and Territory - Volume 5

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Aggregate is a major constituent of composite building materials. Therefore, aggregate characteristics have an important influence on mortar properties. The objective of this paper is to study the properties and therefore determine the suitability of crushed fine aggregates used in the production of cement mortars. Standardized tests were performed on aggregate samples of different mineralogical composition quarried in Cyprus. Correlations between (i) the soundness coefficient and other physicomechanical properties of the aggregates tested, such as their resistance to degradation by abrasion in the Micro-Deval apparatus, water absorption, sand equivalent and methylene blue values and (ii) the quality of fine aggregates and of the final product were investigated. X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) analyses were also carried out, in order to determine the mineralogical and chemical composition of the samples under study. While no correlations were observed among most of the aggregate properties investigated, the effect of aggregate characteristics on the quality of mortars was clearly evident in the case of diabase aggregates.

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The role of aggregates on the structure and properties of lime mortars

Cited by 111 publications

References 2 publications

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

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

Ageing of lime mortars with admixtures: Durability and strength assessment

A Study of Fine Aggregate Properties and Their Effect on the Quality of Cementitious Composite Materials

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