The effect of viscosity modifying agents on mortar and concrete

Leemann, Andreas; Winnefeld, Frank

doi:10.1016/j.cemconcomp.2007.01.004

Cited by 189 publications

(79 citation statements)

References 8 publications

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“…These results are not common since several papers reported that an increase in VEA dosage leads to a rise in the yield stress [10][11][12]21,46,47], but is in agreement with recent study [17].…”

Section: Yield Stresssupporting

confidence: 80%

“…Leemann and Winnefeld [10] obtained similar results with starch derivatives incorporated in self-compacting mortar. In contrast, Cappellari et al [17] obtained a reduction in yield stress of mortar with increasing dosage of hydroxyethyl methyl cellulose.…”

Section: Introductionsupporting

confidence: 68%

“…According to many authors, incorporation of polysaccharide leads to an increase in apparent viscosity of cement-based materials because of an increase in the pore solution viscosity [7,10,12,13]. Fig.…”

Section: Consistencymentioning

confidence: 99%

“…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%

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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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Section: Yield Stresssupporting

confidence: 80%

Section: Introductionsupporting

confidence: 68%

Section: Consistencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Poinot

Govin

Grosseau

2014

Cement and Concrete Research

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“…Yu et al 2005;D'Aloia Schwartzentruber et al 2006;Ed. Malhotra 2006;Sonevi 2006;Leemann and Winnefeld 2007;De Schutter et al 2008;Paiva et al 2009). However, in literature still is felt the insufficiency of systematic research on influence of VEA on rheology of fresh cement mixtures with different cements and superplasticizers In this paper the methodology and the results of investigation into the influence of VEA type and content on the rheological properties and on the compressive strength of mortars with different cements and superplasticizers are presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Viscosity Enhancing Agent on Rheology and Compressive Strength of Superplasticized Mortars

Gołaszewski

2009

Journal of Civil Engineering and Management

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To cite this article: Jacek Gołaszewski (2009) Abstract. The results of investigation into the influence of Viscosity Enhancing Agents (VEA) on the rheological properties of mortars, different in cement and superplasticizer properties, are presented and discussed. Rheology results have been evaluated according to the Bingham model, which describes the rheology with 2 parameters: yield value and plastic viscosity. Rheological parameters were measured using Two-Point Workability Test (TPWT). Additionally, the influence of VEA on compressive strength of mortars is presented. It was found that effects of VEA addition on rheological properties of mortars, as well as on compressive strength of mortars, significantly depend on cement and superplasticizer properties. Basic relation of influence of VEA on rheological properties and compressive strength of mortars in respect to cement and superplasticizer properties were presented and discussed. It is concluded that addition of VEA influences compatibility between cement and superplasticizer. Because addition of VEA may cause decrease in compressive strength, the assessment of compatibility of VEA -cement -superplasticizer system should be performed in relation not only to rheological properties, but also to compressive strength.

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Bacterial Materials: Applications of Natural and Modified Biofilms

Hayta

Ertelt

Kretschmer

et al. 2021

Adv Materials Inter

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Over millennia, bacteria have developed clever strategies to build biopolymer‐based communities in which they can survive even extremely challenging conditions. Such bacterial biofilms come with a broad range of fascinating material properties that—in settings such as medicine, food production, or other areas of industry—make it difficult to remove or inactivate them: they can stick to many surfaces, repel water and oils, and can even transport electrons. Inspired by the outstanding versatility and sturdiness of such bacterial biofilms, material scientists have set out to harness those properties and to create bacterial materials for different applications. However, as the range of technological applications employing biofilms keeps expanding, improved material properties or broader functionalities are desired. Here, such attempts where materials with improved properties were created by making use of either natural or modified bacterial biofilms are reviewed. The areas in which those bacterial materials may be used range from agriculture and (environmental) biotechnology over biomedical and electrical engineering to construction engineering.

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The effect of viscosity modifying agents on mortar and concrete

Cited by 189 publications

References 8 publications

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Influence of Viscosity Enhancing Agent on Rheology and Compressive Strength of Superplasticized Mortars

Bacterial Materials: Applications of Natural and Modified Biofilms

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