Natural fibres as retardant of pozzolanic reaction in lime-based plasters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F24%3A00377145" target="_blank" >RIV/68407700:21110/24:00377145 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Natural fibres as retardant of pozzolanic reaction in lime-based plasters

Popis výsledku v původním jazyce

Lime plasters, one of the oldest building materials, have a relatively low strength, so it is appropriate to look for a suitable admixture to extend their strength and consequently also their durability. Moreover, in the case of historic plasters, such an admixture has further requirements for compatibility with the original material. Another aspect that should be taken into account when choosing an appropriate admixture is sustainability and the least possible impact on the environment. Natural fibres appear to be promising materials to meet all the above requirements. This paper investigates the performance of two representatives of natural fibres of plant origin in combination with three different lime-based plasters. It was proven, that attention should be paid especially to the kind of plaster to which these fibres were added. The same type of fibres reacted differently with pure lime, hydraulic lime and above all with pozzolanic-lime-based plaster. In the case of the first two mentioned matrices, wood and colza fibres caused an improvement in mechanical strength, while in the case of pozzolanic lime, significant retardation and deterioration of the pozzolanic reaction was observed. It has been shown that these natural fibres decompose in an alkaline environment of lime, leach monosaccharides and simultaneously bind calcium ions. As a result, they reduce the degree of pozzolanic reaction by half. To better understand this incompatibility, the effect of the fibres on the plaster structure was investigated in more detail by porosimetry, scanning electron microscopy and phase composition analysis (STA and XRD). Based on these analysis, the natural fibres with plant origin were found to be incompatible with pozzolanic lime-based plasters.

Název v anglickém jazyce

Natural fibres as retardant of pozzolanic reaction in lime-based plasters

Popis výsledku anglicky

Lime plasters, one of the oldest building materials, have a relatively low strength, so it is appropriate to look for a suitable admixture to extend their strength and consequently also their durability. Moreover, in the case of historic plasters, such an admixture has further requirements for compatibility with the original material. Another aspect that should be taken into account when choosing an appropriate admixture is sustainability and the least possible impact on the environment. Natural fibres appear to be promising materials to meet all the above requirements. This paper investigates the performance of two representatives of natural fibres of plant origin in combination with three different lime-based plasters. It was proven, that attention should be paid especially to the kind of plaster to which these fibres were added. The same type of fibres reacted differently with pure lime, hydraulic lime and above all with pozzolanic-lime-based plaster. In the case of the first two mentioned matrices, wood and colza fibres caused an improvement in mechanical strength, while in the case of pozzolanic lime, significant retardation and deterioration of the pozzolanic reaction was observed. It has been shown that these natural fibres decompose in an alkaline environment of lime, leach monosaccharides and simultaneously bind calcium ions. As a result, they reduce the degree of pozzolanic reaction by half. To better understand this incompatibility, the effect of the fibres on the plaster structure was investigated in more detail by porosimetry, scanning electron microscopy and phase composition analysis (STA and XRD). Based on these analysis, the natural fibres with plant origin were found to be incompatible with pozzolanic lime-based plasters.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA22-00420S" target="_blank" >GA22-00420S: Funkční charakteristiky a environmentální dopad vápenných omítek s přírodními přísadami pro rekonstrukce historických budov</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

15th Conference on Calorimetry and Thermal Analysis

ISBN

978-83-968224-4-4

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

77-78

Název nakladatele

Politechnika Gdanska

Místo vydání

Gdaňsk

Místo konání akce

Zakopane

Datum konání akce

8. 9. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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