The Influence of Limestone Additions on the Rheological Properties and Water Retention Value of Portland Cement Slurries

Neto, C. Pagliosa; Campiteli, VC

doi:10.1520/stp23468s

Cited by 10 publications

(5 citation statements)

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“…This was due to none reaction of LF particles as resulting in an increase of water needed for lubrification of grout. These results concord with other findings [44].…”

Section: Discussion Of the Effect Of Vma Sp Lf And W/bsupporting

confidence: 89%

Effect of mix proportions on rheology and permeability of cement grouts containing viscosity modifying admixture

Sonebi

Perrot

2019

Construction and Building Materials

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This paper reports the effect of mix composition of grout on the fluidity, rheological behaviour and hydro-mechanical behaviour (permeability and compressibility). Factorial design was used in this investigation to assess the combined effects of the four mix composition parameters on fluidity, rheological properties, permeability and compressibility: water/binder ratio (W/B), percentage of limestone filler as replacement of cement (LF), dosage of viscosity modifying admixture (VMA), and dosage of superplasticiser (SP). To evaluate both the rheology of the cement grout and its hydro-mechanical behaviour, mini-slump test, Lombardi plate test, and forced bleeding test, coaxial rotating cylinder viscometer were used. A two-level fractional factorial model was used to model the effect of key variables on the fluidity, the cohesion, permeability and compressibility. The predicted models are valid for mixtures made with W/B ranged from 0.35 to 0.42, LF from 12% to 45% as replacement of cement, VMA (percentage of binder) from 0.02 to 0.7%, and SP from 0.3 to 1.2%. The effects of W/B, LF, VMA and SP were analysed using polynomial regression which can identify the primary factors and their interactions on the measured properties. Prediction models were developed for mini-slump, plate cohesion meter, permeability and compressibility as function of W/B, LF, VMA, and SP. The factorial statistical approach used highlighted the effect of W/B, the dosages of SP and VMA on the various rheological properties, permeability and compressibility.

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“…This was due to none reaction of LF particles as resulting in an increase of water needed for lubrification of grout. These results concord with other findings [44].…”

Section: Discussion Of the Effect Of Vma Sp Lf And W/bsupporting

confidence: 89%

Effect of mix proportions on rheology and permeability of cement grouts containing viscosity modifying admixture

Sonebi

Perrot

2019

Construction and Building Materials

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“…It was noted that the LP was very effective on the concrete rheology and provided the better cohesion and plasticity in the concrete [32]. Neto and Campitelli [34] used a two-point test technique to characterize the rheology of PC paste with the LP. They observed a decrease in the yield stress of cement paste when LP amount increased.…”

Section: Introductionmentioning

confidence: 99%

Optimum limestone powder amount in mortars with over silica fume

Turğut¹,

Ogretmen²

2019

Epitoanyag - JSBCM

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“…However, it was demonstrated that only 25-50 per cent replacement would be possible without significant and deleterious effects (Ingram et al, 1990;Campiteli and Florindo, 1990). As other mineral admixtures, calcareous filler modifies concrete properties showing, as a general rule, a beneficial effect (Neto and Campiteli, 1990;Adamas and Race, 1990;Bédard and Bergeron, 1990;Nehdi and Mindess, 1996;Tsivilis et al, 2000;Douglas Hooton, 1990;Matschei et al, 2007a, b;González and Irassar, 1998;Lothenbach et al, 2008). Some adverse consequences on the drying shrinkage of Portland cement were reported (Adams and Race, 1990).…”

Section: Introductionmentioning

confidence: 99%

Rebar corrosion in mortars with high limestone filler content

Batic

Sota

Fernández

et al. 2013

Anti-Corrosion Methods and Materials

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PurposeThis research aims to study the influence of limestone filler on rebar corrosion.Design/methodology/approachMortar samples containing 35% calcareous filler and with a rebar inserted in the axis, were cast. Specimens were cured at the open air and during 28 days in lime water. After curing, they were submerged in two electrolytes (tap water and 3% NaCl) and corrosion parameters (corrosion potential and corrosion current) were monitored over time by d.c. techniques. Simultaneously, electrochemical noise measurements were carried out. After corrosion tests, rebars were pulled out by lateral compression, and their surface observed by scanning electron microscopy.FindingsIn general, carbonate additions impaired mortar protective properties, especially in the presence of chloride and changed the nature of the protective layer on rebars. The curing process did not introduce significant differences except for mortars with a high water cement ratio cured in lime water for which the beneficial effects of the simultaneous presence of carbonate and lime in the pore solution could be appreciated. The role of carbonate additions is to provide carbonate anions to passivate rebars. This passivation process caused corrosion rates not to be so high. Carbonate anions also deposited on oxide spots which were rendered passive but this process was not uniform. Certain areas on the rebar underwent intense carbonation while others showed increased corrosion rates.Originality/valueThere are not many corrosion studies about the influence of limestone filler on rebars corrosion. Particularly, this paper deals with mortars containing high percentages of carbonate additions. Results showed that the presence of this type of admixture changes the structure of the passive layer and, sometimes, may increase corrosion rates.

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The Influence of Limestone Additions on the Rheological Properties and Water Retention Value of Portland Cement Slurries

Cited by 10 publications

References 0 publications

Effect of mix proportions on rheology and permeability of cement grouts containing viscosity modifying admixture

Effect of mix proportions on rheology and permeability of cement grouts containing viscosity modifying admixture

Optimum limestone powder amount in mortars with over silica fume

Rebar corrosion in mortars with high limestone filler content

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