Rheology and hardened properties of single-coat render mortars with different types of water retaining agents

Paiva, Helena; Esteves, Luís Pedro; Cachim, Paulo; Ferreira, Victor

doi:10.1016/j.conbuildmat.2008.06.001

Cited by 99 publications

(68 citation statements)

References 11 publications

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“…They have also been proved to act as set-retarders (Peschard, Govin, Pourchez, Fredon, Bertrand, Maximilien & Guilhot, 2006). Furthermore, they improve some of the properties in the hardened state (Jolicoeur & Simard, 1998;Paiva, Silva, Labrincha & Ferreira, 2006;Paiva, Esteves, Cachim & Ferreira, 2009). This kind of additive is able to fix water in the structure, reducing the amount of free water in the mixture and producing an increase in viscosity.…”

Section: Introductionmentioning

confidence: 99%

“…Among all the derivatives, hydroxypropyl-methyl-cellulose (HPMC) and hydroxyethyl-methyl-cellulose (HEMC) are the most widely used (Paiva, Esteves, Cachim & Ferreira, 2009). In general, some of these water-retaining products improve the homogeneity of the mixture, enhance its workability and reduce segregation amongst the components of the mortar.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of a starch as a viscosity modifier for aerial lime-based mortars

Izaguirre

Lanas²,

Álvarez

2010

Carbohydrate Polymers

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Different dosages of a commercialized potato starch were added to aerial lime-based mortars in order to check its efficiency as a rheological modifier. Several fresh state properties of the mortars were studied: consistency, density, air content, water retention capacity, setting time and evolution when applied on support. The effect of the starch on -potential of the lime particle surface as well as the particle size distribution and viscosity changes in lime pastes were also assessed in order to elucidate the action mechanism of the polymer. The behaviour of the starch was found to be strongly dosage-dependent: it acted as a thickener when the incorporated dosage was up to 0.30% of lime weight; conversely, above that dosage, it behaved as a plasticizer. The thickening effect took place because polymer molecules were adsorbed onto lime particles acting as a flocculant, as confirmed by -potential and particle size distribution results. For large amounts of polymer, steric hindrance and electrostatic repulsive forces appeared, leading to a dispersion mechanism which explained the plasticizing effect as well as the fresh mortar behaviour.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behaviour of a starch as a viscosity modifier for aerial lime-based mortars

Izaguirre

Lanas²,

Álvarez

2010

Carbohydrate Polymers

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“…The use of VEAs allows overcoming this problem by enhancing the sedimentation resistance while maintaining high fluidity [8][9][10][11][12][13]. The incorporation of VEA in shotcrete or render mortar is also very useful to ensure sagging resistance for thick application on vertical support, and allows sufficient fluidity for normal pumpability [10,[14][15][16][17] by supplying shear thinning rheological behavior. Thus polysaccharides provide high yield stress and apparent viscosity at low shear rate but low resistance to flow at high shear rate [7].…”

Section: Introductionmentioning

confidence: 99%

“…Among the polysaccharidic VEAs, microbial-source polysaccharides such as welan gum [11][12][13]20,21] and cellulose ethers [14][15][16][17]22] are the most widely used and studied. Nevertheless, the hydroxypropylguar (HPG) are now well-established in the construction industry as water retention agent for mortars [23].…”

Section: Introductionmentioning

confidence: 99%

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Poinot

Govin

Grosseau

2014

Cement and Concrete Research

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To cite this version:Thomas Poinot, Alexandre Govin, Philippe Grosseau. Influence of hydroxypropylguars on rheological behavior of cement-based mortars. Cement and Concrete Research, Elsevier, 2014, 58, pp.161-168 properties was thus investigated thanks to a suitable measurement procedure. HPG allows keeping a positive yield stress value while the yield stress of hydroxypropyl methyl cellulose (HPMC) mortars was found to decrease with an increase in dosage. HPG increases the shearthinning behavior and the consistency of mortars. The study of pore solution viscositysuggests that the entanglement of HPG coils beyond a threshold dosage is crucial to understand the rheological macroscopic behavior of HPG-admixed mortars. Nevertheless, the increase in mortar viscosity induced by HPG was lower than expected which reveals additional and specific repulsive forces induced by polysaccharides.

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“…A rheometer (Viskomat PC model, Schleibinger) was used to measure the rheological behaviour of fresh mortars, using a maximum speed rotation (100 rpm) and 60 min of total test time. The rheological parameters (yield stress and plastic viscosity), was defined by using the Bingham model (27)(28)(29)(30). The workability Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Lime mud from cellulose industry as raw material in cement mortars

Modolo¹,

Senff²,

Labrincha³

et al. 2014

Mater. construcc.

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ABSTRACT:This study reports the use of lime mud (LM) in cement-based-mortars. Lime mud is a waste generated in the production of cellulose by the kraft mill process. It is mainly composed of CaCO 3 , a small amount of magnesium carbonate and other trace minerals. Mortars were prepared by adding different amounts of LM (10, 20 and 30% by weight of cement) in dry weight. The mortar compositions were evaluated through rheology and flow table measurements, assuring that all the samples exhibited adequate conditions for testing in both equipments. The hardened state properties were also evaluated through mechanical strengths at 7, 28 and 90 days of curing. Following a waste management solution perspective, this work intend to provide a general evaluation of LM application in cement based mortars, looking at both fresh and hardened properties in order to guarantee that the final application requirements are not hindered. RESUMEN: Lodo de carbonato de la industria de celulosa como materia prima en las morteros de cemento.Este estudio revela el uso de lodo de carbonato (LM) en morteros de cemento. El LM es un residuo compuesto principalmente por CaCO 3 generado en la producción de pasta de papel por el método Kraft. Los morteros se prepararon a partir de la adición de diferentes niveles de LM (10, 20 y 30% en peso de cemento) en peso seco. Las composiciones de los morteros fueron caracterizadas através de mediciones de reología de mesa y de flujo, asegurando que las muestras exhibían condiciones adecuadas para su caracterización en ambos equipamientos. Las propiedades en estado endurecido también se evaluaron através de resistencias mecánicas a los 7, 28 y 90 días de cura. Con objeto de gestión de residuos, este trabajo tiene la intención de proporcionar una visión general de la aplicación de LM en los morteros, haciendo hincapié en las propiedades con el fin de garantizar que los requisitos para su aplicación final no se vean obstaculizados.

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Rheology and hardened properties of single-coat render mortars with different types of water retaining agents

Cited by 99 publications

References 11 publications

Behaviour of a starch as a viscosity modifier for aerial lime-based mortars

Behaviour of a starch as a viscosity modifier for aerial lime-based mortars

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Lime mud from cellulose industry as raw material in cement mortars

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