The role of calcium ions and lignosulphonate plasticiser in the hydration of cement

Grierson, Lebert; Knight, J. C.; Maharaj, Ravi

doi:10.1016/j.cemconres.2004.05.048

Cited by 50 publications

(19 citation statements)

References 18 publications

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“…With respect to the influence of admixture dosage, naphthalene content had the least effect on initial setting time, followed by polycarboxylate dosage and lignosulfonate dosage, respectively. The potent retarding effects of lignosulfonate-based admixtures are well known and amply discussed in the literature [1,9,10].…”

Section: Effect Of Temperature Variation and Admixture Dosage Onmentioning

confidence: 99%

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

Silva

Prudêncio

Oliveira

et al. 2010

Advances in Civil Engineering

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The performance of water-reducing admixtures used in concrete is affected by the weather conditions to which the concrete mixture is exposed. The most used WRAs are lignosulfonate, naphthalene, and polycarboxylate. However, they react differently to weather conditions, especially to air temperature. Therefore, it can be useful to evaluate how temperature affects admixture performance. In this study, the performance of three admixtures (naphthalene, lignosulfonate, and polycarboxylate) was evaluated at 15, 25, and 35°C by means of the flow table test, mixture air content, and compressive strength. Moreover, mixture temperature was monitored and time-temperature curves were plotted in order to assess whether the admixtures affected cement hydration reactions at different temperatures. The final results indicate that an increase in temperature leads to an increase in saturation dosage; lignosulfonate had the most pronounced retarding effect, followed by polycarboxylate, and finally, naphthalene, and considering the weather conditions in the area where the study was carried, the final finding would be that the naphthalene-based admixture had the best performance.

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Section: Effect Of Temperature Variation and Admixture Dosage Onmentioning

confidence: 99%

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

Silva

Prudêncio

Oliveira

et al. 2010

Advances in Civil Engineering

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“…It prolongs the hydration period of cements. It is reported that the lignosulfonatebased plasticizers greatly modify the initial rheological properties and the final compressive strength of cement base materials [19]. Chandra and Flodin [20] have suggested that the hydration retardation effects of superplasticizers in cement/cement admixtures are due to the interaction of Ca 2?…”

Section: Introductionmentioning

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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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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“…The results indicated that the superplasticiser inhibits the hydration reaction as demonstrated by the reduced formation of calcium hydroxide as well as a lower degree of polymerisation of silicate anions. A plasticiser has a dual role; one mainly as a kinetic inhibitor (poison) in the cement hydration mechanism and the other as a dispersant Cody et al (2004) and Grierson et al (2005) concluded that the lignosulfonate plasticiser inhibited ettringite nucleation and growth. Hydration in the presence of sulfate leads to very rapid ettringite (AFt) formation, with the first evidence of ettringite formation within 3 min.…”

Section: Introductionmentioning

confidence: 98%

Hydration reactions of the C₃A-CaSO₄.2H₂O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate

Kishar¹,

Hegazy²,

Ahmed³

2010

Advances in Cement Research

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The hydration characteristics of a tricalcium aluminate and gypsum mixture with a mole ratio of 1 : 1 in the presence and absence of calcium lignosulfonate at 30 and 508C were investigated. Different ratios of calcium lignosulfonate were used namely 0, 1 and 3% by weight. The water-to-solid ratio used was 10. Hydration was carried out for various time intervals from 0 . 5 h up to 90 days. Ettringite and monosulfate hydrate were the only hydration products formed as indicated by X-ray diffraction analysis and scanning electron microscopy. The results of combined water content, X-ray diffraction and scanning electron microscopy indicate that calcium lignosulfonate retarded the formation of ettringite at early hydration ages. The extent of hydration was inversely proportional to the ratio of calcium lignosulfonate.

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The role of calcium ions and lignosulphonate plasticiser in the hydration of cement

Cited by 50 publications

References 18 publications

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

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

Hydration reactions of the C₃A-CaSO₄.2H₂O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate

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The role of calcium ions and lignosulphonate plasticiser in the hydration of cement

Cited by 50 publications

References 18 publications

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

Influence of Air Temperature on the Performance of Different Water-Reducing Admixtures with Respect to the Properties of Fresh and Hardened Mortar

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

Hydration reactions of the C3A-CaSO4.2H2O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate

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Hydration reactions of the C₃A-CaSO₄.2H₂O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate