Effect of Type of Curing and Metakaolin Replacement on Air Lime Mortars for the Durability of Masonries

Monteiro, João; Silva, Vítor; Faria, Paulina

doi:10.3390/infrastructures6100143

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…Practice and research [104,105] have shown that hydration of a pozzolan may as well occur under relatively dry curing conditions if the pozzolan is a reactive one (e.g. pozzolan from Santorini, or metakaolin).…”

Section: Generalmentioning

confidence: 99%

RILEM TC 277-LHS report: lime-based mortars for restoration–a review on long-term durability aspects and experience from practice

et al. 2022

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For conservation interventions of historic masonry generally lime-based mortars such as pure air lime mortars, lime-pozzolan mortars, natural hydraulic lime mortars and ternary mortars (lime-pozzolan-cement) are used. The main reason is that their hygric and mechanical (strength and ductility) performance are easy to adapt to most existing historic masonry (compatibility requirements). Although the basic appropriateness of lime-based mortars for restoration is undisputed, there are also some limitations in the application of these mortars. In this report a review is given of the theoretical backgrounds and further of laboratory research developments in the field of lime-based binders and mortars over the past decades. Furthermore, practical experiences in positive and negative sense (damage cases) are elaborated. Drawbacks and points of attention are being dealt with, which are essential for a durable application of lime-based mortars for the conservation of historic masonry. In general, it is concluded that points of attention should be addressed through a thorough evaluation of their potential and through testing of their suitability. For these mortars, even more than for modern cement-based mortars, specifically, environmental exposure conditions and application conditions should be considered.

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Section: Generalmentioning

confidence: 99%

RILEM TC 277-LHS report: lime-based mortars for restoration–a review on long-term durability aspects and experience from practice

et al. 2022

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“…The displacement of the compression head was assumed to be 3 mm/min. In other studies [39], a slower displacement increment of 0.7 mm/min was assumed. In other studies [13], the load increment was controlled at the level of 0.02 MPa/s.…”

Section: Flexural and Compressive Strengthsmentioning

confidence: 99%

The Influence of Gum Arabic Admixture on the Mechanical Properties of Lime-Metakaolin Paste Used as Binder in Hemp Concrete

Brzyski

2021

Materials

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Organic admixtures based on polysaccharides are used in construction for modifying the properties of mortars and concretes. Gum arabic is an example of a polysaccharide-based biopolymer. The aim of the article was to investigate the possibilities of improving the strength parameters of a binder paste based on hydrated lime and metakaolin. The paste was modified with powdered gum arabic at 1%, 3% and 5% (by mass) as a partial replacement for the binder mix. The influence of the admixture on the pore size distribution as well as flexural and compressive strength was investigated. The admixture enhanced the total porosity of the paste, increasing the pore diameter compared with the reference formulation. The increase in porosity, in turn, did not reduce the mechanical strength. Conversely, the admixture in the amount of 3% and 5% caused a significant increase in the flexural (by about 300% in relation to reference paste) and compressive strengths (by 25% and 60%, respectively). The tested pastes were used as a binder in a composite based on hemp shives. The influence of binder modification on the water absorption and compressive strength of hemp concrete was tested. The strength of the composite soaked in water was also tested. The modification of the binder with gum arabic in the amount of 3% and 5% increased the compressive strength of hemp concrete (not soaked in water) by 53% and 92%, respectively and reduced the mass absorptivity by 6.6% and 10.4%, respectively.

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Pozzolanic metakaolin reactivity: Time-dependent influence of calcium hydroxide, alkali hydroxides, and sulfates

Weise,

Endell,

Ukrainczyk

et al. 2024

Construction and Building Materials

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Effect of Type of Curing and Metakaolin Replacement on Air Lime Mortars for the Durability of Masonries

Cited by 6 publications

References 31 publications

RILEM TC 277-LHS report: lime-based mortars for restoration–a review on long-term durability aspects and experience from practice

RILEM TC 277-LHS report: lime-based mortars for restoration–a review on long-term durability aspects and experience from practice

The Influence of Gum Arabic Admixture on the Mechanical Properties of Lime-Metakaolin Paste Used as Binder in Hemp Concrete

Pozzolanic metakaolin reactivity: Time-dependent influence of calcium hydroxide, alkali hydroxides, and sulfates

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