Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars

Popis výsledku v původním jazyce

The addittion of guar gum derivatives and chitosan ethers has been studied in the natural hydraulic lime (NHL) mortars. These types of polysaccharides can be possibly used as viscosity enhancing admixtures or water retaining agents for the mortars instead of cellulose ethers. The water retention capacity is an essential property of the mortars to enhance the hydration of NHL and mortar adhesion to the substrate. The main part of this study is addressed to the physico-mechanical properties, microstructure, and durability of NHL mortars. The hydroxypropyl- derivatives showed air-entraining function, which is beneficial for the durability of mortars and affects porosity of mortars, as well as water absorption coefficient. The biopolymer addition slightly improved initial flexural strength with the increasing difference for later ages, the only exception being hydroxypropyl guar, which showed slight decrease of flexural strength. Compressive strength decreased by the addition of biopolymeric admixture in all cases; the degree od decrease was dependent on the type and dosage of the admixture.

Název v anglickém jazyce

Impact of guar gum and chitosan ethers on physico-mechanical properties and durability of natural hydraulic lime mortars

Popis výsledku anglicky

The addittion of guar gum derivatives and chitosan ethers has been studied in the natural hydraulic lime (NHL) mortars. These types of polysaccharides can be possibly used as viscosity enhancing admixtures or water retaining agents for the mortars instead of cellulose ethers. The water retention capacity is an essential property of the mortars to enhance the hydration of NHL and mortar adhesion to the substrate. The main part of this study is addressed to the physico-mechanical properties, microstructure, and durability of NHL mortars. The hydroxypropyl- derivatives showed air-entraining function, which is beneficial for the durability of mortars and affects porosity of mortars, as well as water absorption coefficient. The biopolymer addition slightly improved initial flexural strength with the increasing difference for later ages, the only exception being hydroxypropyl guar, which showed slight decrease of flexural strength. Compressive strength decreased by the addition of biopolymeric admixture in all cases; the degree od decrease was dependent on the type and dosage of the admixture.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

PRO 130: 5th Historic Mortars Conference

ISBN

978-2-35158-221-3

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

1279-1290

Název nakladatele

RILEM Publications S.A.R.L.

Místo vydání

Francie

Místo konání akce

Pamplona

Datum konání akce

19. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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