Addition of cement to lime-based mortars: Effect on pore structure and vapor transport

Mosquera, María J.; Silva, B.; Prieto, B.; Ruiz-Herrera, E.

doi:10.1016/j.cemconres.2004.10.041

Cited by 87 publications

(68 citation statements)

References 13 publications

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“…However, some problems related to the use of aerial lime-based mortars still remain such as: i) long setting and hardening time; ii) relatively low mechanical strength; iii) a high water absorption capacity through capillarity; iv) major volumetric change as a result of shrinkage [4]. In order to reduce or even solve these problems, the use of admixtures might be considered.…”

Section: Introductionmentioning

confidence: 99%

“…Several drawbacks and incompatibilities related to the use of cement mortars for Cultural Heritage restoration work have been highlighted: high mechanical strength, efflorescence phenomena owing to formation of large amounts of soluble salts by migration of alkaline ions, low water vapour permeability and higher thermal expansion coefficient than most masonry [1][2][3][4]. In view of these shortcomings, lime-based mortars show greater compatibility with ancient building materials and fulfil the recommendations of ICCROM [5] about the use of materials similar to the original ones in repair works.…”

Section: Introductionmentioning

confidence: 99%

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Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Izaguirre

Lanas²,

Álvarez

2009

Cement and Concrete Research

116

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Two different anionic surfactants, sodium oleate and calcium stearate, commercialized as water repellents for cement-based mortars, were added to lime-based mortars in order to check whether they were improved by these admixtures. Different properties of limebased mortars were evaluated: fresh state behaviour through water retention, air content and setting time, hardened state properties such as density, water absorption through capillarity, water vapour permeability, long-term compressive strengths, pore structure through mercury intrusion porosimetry, and durability assessed by means of freezingthawing cycles. A clear improvement in lime-based mortars was achieved when sodium oleate was added: strong capillarity reduction and excellent durability in the face of freezing-thawing processes, without any compressive strength drop. The mechanism for this improvement was related to air void formation due to the air entraining ability of these surfactants. Insolubility of calcium stearate turned out to be responsible for fewer air bubbles -as SEM examination revealed -and showed lower effectiveness.3

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Izaguirre

Lanas²,

Álvarez

2009

Cement and Concrete Research

116

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“…Their effects on the rheological and hardened properties of lime-based mortars had been previously researched [29]. A fibre reinforcement was tested because it was expected to improve mechanical strengths and shrinkage, which are weak points in aerial lime-based mortars [30]. The selection of a polypropylene fibre is based on its efficiency as well as to its great cost-effectiveness for cement mortars [19,22].…”

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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“…Secondly, when lime hardens, it reabsorbs carbon dioxide that was released in the burning process from limestone, through carbonization. And thirdly, excellent water vapour permeability of the hardened lime binder (Mosquera et al 2004) makes it fully compatible with hemp shives to create a material with good moisture regulating properties.…”

Section: Introductionmentioning

confidence: 99%

Artificial hydraulic lime binder and its impact on properties of hemp-lime compositions

Šinka

Šahmenko

Korjakins

et al. 2014

Proceedings of the International Conference „Innovative Materials, Structures and Technologies”

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Abstract. The rising global temperature is partly associated with the increase of anthropogenic carbon dioxide (CO2) emissions. Major part of this CO2 comes from building material industry and from energy consumed to maintain buildings. To solve this problem a building material that both has low thermal conductivity and emits low amount of CO2 is needed. Hemp and hydraulic lime building materials are one of these materials, but they are not widely used partly due to insufficient research of their possible properties. The aim of this research was to find optimal composition of artificial hydraulic lime binder and to elaborate appropriate compositions of hemp-lime insulating material. The binder itself was also to be tested as multiple air limes were supplemented with different additives and the most appropriate for use in hemp-lime material was to be chosen -a dolomitic lime DL60 with 40% metakaolin additive. The ratio of hemp/binder 0.38 gave the best results -compressive strength of 0.221 MPa at 10% deformation and thermal conductivity of 0.0757 W/m 2 k, which is considered a good result and shows a possibility for this material to be used as self-bearing thermal insulation building material.

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Addition of cement to lime-based mortars: Effect on pore structure and vapor transport

Cited by 87 publications

References 13 publications

Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Ageing of lime mortars with admixtures: Durability and strength assessment

Artificial hydraulic lime binder and its impact on properties of hemp-lime compositions

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