Effect of hydrophobization on the properties of lime–metakaolin plasters

Vejmelková, Eva; Koňáková, Dana; Čáchová, Monika; Keppert, Martin; Černý, Robert

doi:10.1016/j.conbuildmat.2012.07.097

Cited by 44 publications

(21 citation statements)

References 38 publications

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“…The positive effect of MK dose in high strength concrete and HPC has been verified in several research works 24,25 when the long-term characteristics due to the pozzolanic reaction were gradually increased; high specific surface area measured by Blaine apparatus is a prerequisite for its high reactivity.…”

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confidence: 99%

Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Holčapek

Reiterman

Konvalinka

2015

Advances in Mechanical Engineering

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The aim of present article is to describe influence of composition of refractory composites on its response to gradual thermal loading. Attention was focused on the impact of ceramic fibers and application of metakaolin as an aluminous cement supplementary material. Studied aluminate binder system in combination with natural basalt fine aggregates ensures sufficient resistance to high-temperature exposure. Influence of composition changes was evaluated by the results of physical and mechanical testing-compressive and flexural strength, bulk density, and fracture energy were determined on the different levels of temperature loading. Application of ceramic fibers brought expected linear increase of ductility in studied composites. Metakaolin replacement showed the optimal dose to be just about 20% of aluminous cement weight.

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mentioning

confidence: 99%

Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Holčapek

Reiterman

Konvalinka

2015

Advances in Mechanical Engineering

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“…Actually, such water can induce several damages to the surface layer or to the structure of the wall due to freeze/thaw cycles or salt crystallization for example. Studies of hydrophobization of plasters are thus investigated in order to reduce the risk of liquid water in walls [4] [5].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Hygric and thermal properties of hemp-lime plasters

Mazhoud

Collet

Prétot

et al. 2016

Building and Environment

124

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To cite this version:Brahim Mazhoud, Florence Collet, Sylvie Pretot, Julien Chamoin. Hygric and thermal properties of hemp-lime plasters.Building and Environment, Elsevier, 2016Elsevier, , 96, pp.206-216. 10.1016Elsevier, /j.buildenv.2015 M A N U S C R I P T A C C E P T E D AbstractHemp-lime mortars are generally used as indoor insulating plasters of building envelopes. They can be applied in thick coat to allow high enough hygrothermal performances to be reached in retrofit case. This study investigates hygric and thermal properties of two hemp-lime plasters. These plasters are made with the same lime-based binder and differ from their kind of hemp shiv. The two kinds of hemp shiv are defibered but one is smaller than the other. This experimental study is based on the measurement of sorption isotherm, water vapour permeability, moisture buffer value and thermal properties (conductivity and diffusivity). The effect of temperature on moisture buffer value and on thermal properties is also investigated. It is shown that hemp-lime plasters are hygroscopic and breathable materials. They are good hygric regulators according to the Nordtest classification and their moisture buffering ability is slightly impacted by temperature in the range from 11° to 23°C. The hemp-lime plaster with the smallest hemp M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 shiv is a better hygric regulator than the one with the biggest hemp shiv. Hemp-lime plasters show a quite low thermal conductivity, around 0.2 W/(m.K). The hemp-lime plaster with the smallest hemp shiv is slightly more conductive than the one with the biggest hemp shiv. The temperature does not impact thermal conductivity at dry state. At wet state, for a given relative humidity, when the temperature increases the thermal conductivity decreases simultaneously with water content. This study underlines that hemp-lime plasters show high hygrothermal qualities.

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“…The chemical composition and specific surface area (m ) measured by Blaine apparatus of used aluminous cement Secar®71 and metakaolin Mefisto K 05 is shown in Table 1. The positive effect of metakaolin dose in high strength concrete and high performance concrete has been verified in several research works [17,18] when the long-term characteristics due to the pozzolanic reaction were gradually increased; high specific surface area measured by Blaine apparatus is a prerequisite of its high reactivity. Ceramic micro fibers were used to strengthen resistance of developed composites to cracking.…”

Section: Studied Materialsmentioning

confidence: 99%

Impact of metakaolin additive on residual mechanical properties of cement based composites loaded by high temperature

Reiterman¹,

Holčapek²,

Jogl³

et al. 2015

Computational Methods and Experimental Measurements XVII

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The aim of this paper is to describe the influence of the composition of refractory composites on their response to gradual thermal loading. Aluminous cement binder system was modified by metakaolin additive which is produced by calcination and grinding of natural clay. Studied aluminous additive is often used for production of high strength composites with increased mechanical and durability properties. The fundamental problem of these composites is their brittle rupture which is why studied composites were reinforced by very short ceramic fibers.Studied aluminate binder system in combination with natural basalt fine aggregates ensures sufficient resistance to high temperature exposure. The influence of composition changes was evaluated by the results of physical and mechanical testing -compressive and flexural strength and bulk density were determined on the different levels of temperature loading. Application of ceramic fibers brought an expected linear increase of mechanical parameters of studied composites just up to dose of 4% by volume. Metakaolin replacement showed the optimal dose just about 20% of aluminous cement weight.The extensive application of cement supplementary materials has an important motivation because of high energy consumption of aluminous cement based refractory composites. It was experimentally verified that the appropriate combination of aluminous cement with metakaolin additive and natural crushed basalt aggregates ensure sufficient properties for practical utilization of proposed composites.

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Effect of hydrophobization on the properties of lime–metakaolin plasters

Cited by 44 publications

References 38 publications

Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Hygric and thermal properties of hemp-lime plasters

Impact of metakaolin additive on residual mechanical properties of cement based composites loaded by high temperature

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