Effects of fineness of cement on polynaphthalene sulfonate based superplasticizer–cement interaction

Aydın, Serdar; Aytaç, Ayhan; Ramyar, Kambiz

doi:10.1016/j.conbuildmat.2008.10.004

Cited by 33 publications

(11 citation statements)

References 10 publications

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“…As referred to in [16,21,34] all plasticizers retarded the hydration of the Portland cements. The retardation of cement hydration by PCEs is mainly due to adsorption of the polymers on the surface of the cement particles and growth of various morphology early hydrates.…”

Section: Resultsmentioning

confidence: 98%

“…Such differences were determined by different fineness and mineralogical composition of both cements. Although limestone cement contains more C 3 A, however, as a result of fine limestone additive (CaCO 3 ), water reaches cement particles surface worse, while slag cement contains more C 2 S and C 3 S that featuring in better hydration properties [21,33,34].…”

Section: Resultsmentioning

confidence: 99%

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Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Pundienė

Kičaitė

Pranckevičienė

2015

J Therm Anal Calorim

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Portland cement manufacturing significantly contributes to CO 2 emissions into the atmosphere. In order to reduce CO 2 emissions, limestone and slag mineral admixtures are most prospective both technologically and economically in cement production. For such cements, it is important to select a certain type and amount of plasticizer and evaluate what plasticizers influence the heat released during hydration. In order to achieve the objectives of research, viscosity, conductivity, and DSC analyses of cement pastes with A and B plasticizers were performed. This study analyzes the effect of polycarboxylate ester (A) and modified lignosulfonate (B) plasticizers amount on rheological properties and hydration processes of the limestone and slag cement pastes. The use of A additive in contrast to B additive has a long-term effect on viscosity of both cement pastes and is less sensitive to mineral composition. Optimal A additive amount in case of limestone cement is 1.25 % and in case of slag cement is 0.3 %. In limestone cement additive A reduces total heat value by 6 % and additive B by 15 % after 48 h of hydration. In slag cement additive A increases total heat value by 4 % and additive B by 2 % after 48 h of hydration. Exothermal profiles show that in limestone cement additive A extends the EXO maximum time by 25 % and additive B by 40 % in samples after 24 h of hydration. In slag cement additive A extends the EXO maximum time by 37 % and additive B by 25 % in samples after the same time of hydration.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Pundienė

Kičaitė

Pranckevičienė

2015

J Therm Anal Calorim

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“…Noticed differences may be conditioned by different fineness and mineralogical composition of both cements, containing different amount of C 3 A, C 2 S and C 3 S. It is known that most of plasticizers retard the hydration of the Portland cements [33,35,21,34]. Comparing with rezults of L-0 sample, PCE additive (figure 4a) reduces a wetting heat release rate from 8.6 J/g to 4.4 J/g.…”

Section: Test Resultsmentioning

confidence: 99%

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Šeputytė-Jucikė

Pundienė

Kičaitė

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In general, the higher is the fineness of the particles in the cement paste, the higher is the SP demand. Second, the effectiveness of a SP increases with the SP dosage only up to a certain saturation dosage, beyond which further addition of the SP gives minimal or even no return (Aydın et al, 2009;Jayasree and Gettu, 2008;Price, 2003,). Hence, usage of a SP beyond the saturation dosage is not economical.…”

Section: Introductionmentioning

confidence: 96%

Effects of superplasticiser on rheology and cohesiveness of CSF cement paste

Kwan

Chen

Fung

2012

Advances in Cement Research

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Superplasticiser (SP) is now an indispensable ingredient for the production of concrete. However, its proper use is a great concern because its over-dosage could lead to drastic reduction in the cohesiveness of concrete. Furthermore, experience has indicated that the SP demand, saturation dosage and dosage causing segregation are highly dependent on the powder content and therefore the effects of SP are not simple functions of dosage. This study aims to evaluate the effects of SP dosage on the fresh properties of cement paste containing condensed silica fume (CSF). A number of cement paste samples with different SP dosages and CSF contents were tested. The resultsshowed that the addition of SP would improve the packing density, flowability and rheology but impair the cohesiveness of cement paste. It would also render the cement paste shear thickening. To cater for the effects of powder fineness, it is proposed that the SP dosage should be measured in terms of the quantity of SP per surface area of the powder content.

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Effects of fineness of cement on polynaphthalene sulfonate based superplasticizer–cement interaction

Cited by 33 publications

References 10 publications

Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Effects of superplasticiser on rheology and cohesiveness of CSF cement paste

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