Rheology of natural hydraulic lime pastes modified by non-traditional biopolymeric admixtures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F19%3APU135308" target="_blank" >RIV/00216305:26110/19:PU135308 - isvavai.cz</a>

Result on the web

<a href="http://epitoanyag.org.hu/static/upload/10.14382_epitoanyag-jsbcm.2019.36.pdf" target="_blank" >http://epitoanyag.org.hu/static/upload/10.14382_epitoanyag-jsbcm.2019.36.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14382/epitoanyag-jsbcm.2019.36" target="_blank" >10.14382/epitoanyag-jsbcm.2019.36</a>

Result language

angličtina

Original language name

Rheology of natural hydraulic lime pastes modified by non-traditional biopolymeric admixtures

Original language description

Viscosity enhancing admixtures, widely used to improve characteristics of concrete and ready-mix mortars, are mainly different derivatives of cellulose. Due to the nature of cellulose processing, the environmental-friendlier alternatives should be studied in order to reduce the impact of the building industry on the environment. The rheological study of natural hydraulic lime (NHL) grouts modified by four different biopolymers is carried out to investigate their behaviour in the NHL-based mortars. The biopolymers studied are of seaweed (sodium salt of alginic acid (ALGNA) and carrageenan (CG)) and microbial (diutan gum (DG) and xanthan gum (XG)) origin. The effect of addition of these admixtures in the doses of 0.1%, 0.5%, and 1% was studied using hybrid rheometer with DIN concentric cylinders geometry. The flow properties as well as viscoelastic properties were studied. The addition of any of the admixtures led to the increase in yield stress, with DG being the most effective admixture. Desirable increase in consistency coefficient was observed within the pastes with CG and DG addition having growing dosage dependency, the ALGNA addition also increased the coefficient noticeably, but it was furtherly decreased with growing dose of admixture. The fluidity index lower than 1 expressed shear-thinning behaviour of studied pastes, except the pastes with highest dose of admixtures, and all of the XG pastes. The addition of CG and DG supported the stability of the grout expressed as the increase in critical strain, thus prolongation of linear viscoelastic region. The flow strain was increased by all of the studied admixtures promoting the gel-like behaviour of the pastes. Complex modulus and viscosity measured at 1Hz frequency were unaffected by the DG addition while they were increased notably by addition of other admixtures with ALGNA and XG supporting the resistance to deformation of the grouts studied. Correspondingly to complex modulus increase, the loss tangent is d

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

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

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2019

Confidentiality

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

Name of the periodical

Építöanyag - Journal of Silicate Based and Composite Materials

ISSN

0013-970X

e-ISSN

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Volume of the periodical

71

Issue of the periodical within the volume

6

Country of publishing house

HU - HUNGARY

Number of pages

6

Pages from-to

204-209

UT code for WoS article

000512902100006

EID of the result in the Scopus database

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