The origins of thixotropy of fresh cement pastes

Roussel, Nicolas; Ovarlez, Guillaume; Garrault, Sandrine; Brumaud, Coralie

doi:10.1016/j.cemconres.2011.09.004

Cited by 654 publications

(267 citation statements)

References 39 publications

Supporting

Mentioning

252

Contrasting

Unclassified

Order By: Relevance

“…This range corresponded to materials which did not exhibit significant sedimentation when left at rest for half an hour, and can be mixed by hand without breaking in independent parts. A cement paste is a yield stress fluid [28][29], which means that it can flow if a sufficient stress is applied on it, and acts as a solid otherwise. A yield stress can thus be defined in simple shear, which corresponds to the shear stress needed to induce the transition from the solid to the liquid regime (i.e.…”

Section: Cement Pastementioning

confidence: 99%

NMR observation of water transfer between a cement paste and a porous medium

Fourmentin

Faure

Rodts

et al. 2017

Cement and Concrete Research

View full text Add to dashboard Cite

We show that it is possible to follow the liquid transfer between a cement paste and a porous medium in contact with it, by analyzing the evolution of the distribution of 1 H NMR relaxation times. This in particular makes it possible to see that whatever the initial water fraction in the paste, a porous medium with sufficiently small pores can rapidly extract a significant amount of water from this paste. Afterwards, during the hydration process, the cement paste progressively gets water back from this porous medium. The amount of water thus extracted by the paste finally appears to just compensate the volume loss due to water consumption by the hydration process.

show abstract

Section: Cement Pastementioning

confidence: 99%

NMR observation of water transfer between a cement paste and a porous medium

Fourmentin

Faure

Rodts

et al. 2017

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…The suspension was then held at rest for 6 min. At 10 min, the mortar was pre-sheared for 30 s at 100 s -1 in order to re-homogenize the sample and to eliminate its shear history because of thixotropic character of cementitious materials [40,41]. After a period of rest of 4.5 min, the rheological measurements were started at 15 min.…”

Section: Mortarsmentioning

confidence: 99%

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Poinot

Govin

Grosseau

2014

Cement and Concrete Research

View full text Add to dashboard Cite

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.

show abstract

“…Roussel et al [41] reported that high thixotropy value in the mixtures containing SCM, like fine silica or limestone particles, is related to nucleation effect of these materials in PC mixtures. In fact, the increase in thixotropy without any workability loss can be obtained if the mixing power is sufficient to break the additional C-S-H bonds created by these products.…”

Section: Introductionmentioning

confidence: 99%

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Ahari

Erdem

Ramyar

2015

Cement and Concrete Composites

View full text Add to dashboard Cite

Supplementary cementitious materials Thixotropy Breakdown Drop in apparent viscosity Yield value at rest a b s t r a c tIn this study, thixotropy and structural breakdown of 57 self-consolidating concrete (SCC) mixtures containing various supplementary cementitious materials (SCM) were investigated by different approaches. The effects of SCM type and content on high range water reducer demand and plastic viscosity were also studied. For these purposes, various amounts of silica fume (SF), metakaolin (MK), Class F fly ash (FAF), Class C fly ash (FAC) and granulated blast-furnace slag (BFS) were utilized in binary, ternary, and quaternary cementitious blends in three water/binder (w/b) ratios. Results showed that except BFS, use of SCM in SCC mixtures increased thixotropy values in comparison with the mixtures containing only portland cement (PC). Good correlations were established between structural breakdown area and drop in apparent viscosity values for all w/b ratios. The different methods used to evaluate the thixotropy and structural breakdown got more consistent with each other as w/b decreased.

show abstract

The origins of thixotropy of fresh cement pastes

Cited by 654 publications

References 39 publications

NMR observation of water transfer between a cement paste and a porous medium

NMR observation of water transfer between a cement paste and a porous medium

Influence of hydroxypropylguars on rheological behavior of cement-based mortars

Thixotropy and structural breakdown properties of self consolidating concrete containing various supplementary cementitious materials

Contact Info

Product

Resources

About