Influencia de aditivos basados en policarboxilatos sobre el fraguado y el comportamiento reológico de pastas de cemento portland

Puertas, Francisca; Alonso, M.M.; Vázquez, t.

doi:10.3989/mc.2005.v55.i277.180

Cited by 23 publications

(9 citation statements)

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“…Nonetheless, very few papers have been published on this latter factor, namely the effect of additions on the fluidizing properties of PC-based admixtures. According to some reports [10,16], the effect of the admixture on CEM II/A-V and CEM II/B-L cement pastes is similar to the changes induced in addition-free cement pastes. By contrast, the inclusion of only 0.1% of PC-based admixtures in CEM III/B cement (with around 72% slag by cement weight) led to cement segregation [10,16].…”

Section: Introductionmentioning

confidence: 99%

“…According to some reports [10,16], the effect of the admixture on CEM II/A-V and CEM II/B-L cement pastes is similar to the changes induced in addition-free cement pastes. By contrast, the inclusion of only 0.1% of PC-based admixtures in CEM III/B cement (with around 72% slag by cement weight) led to cement segregation [10,16]. Consequently, slag cements obviously require lower dosages of such admixtures than non-blended Portland cement to attain similar increases in flowability.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, whereas in cement C1 dosages of only 0.25 mg/g cement lowered yield stress by 21-38%, this same dose reduced that parameter by up to 88% in cement pastes C5 (with a slag content of 75%). Similarly, dosages of over 0.5 mg polymer/g binder caused segregation in all C5 cement pastes, and even segregation is observed is these cement pastes when dosages of PC2, PC3, PC4 and PC6 higher than 0.25 mg polymer/g binder [10,16] reported in an earlier paper that PC admixtures had a greater dispersive effect on slag cement than on slag-free Portland cement pastes.…”

Section: Rheological Behaviourmentioning

confidence: 99%

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Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

et al. 2009

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The effect of polycarboxylate (PC) superplasticizers with different structure on the rheological properties and hydration process of slag-blended cement pastes with a slag content between 0 and 75% has been studied. Fluidizing properties of PCs admixtures are significantly higher in slag-blended cement with respect to non-blended Portland cement. Also, it has been observed that the rise of the fluidity induced by the PCs on the cement pastes increases with the slag content. This effect is mainly attributed to a decrease in the amount of C 3 A available to adsorb and consume admixture to form an organo-mineral phase. Consequently, the PC admixtures are absorbed onto the silicate phases of the clinker and onto the slag particles, inducing a repulsion and the concomitant reduction in yield stress despite a reduction in the zeta potential. The rheological results allow us to conclude that the highest increase of the fluidity is caused by the admixtures with highest molecular weight due to the higher steric repulsion induced. As a consequence of the adsorption of the PCs, a delay of the hydration process of the pastes has been observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Rheological Behaviourmentioning

confidence: 99%

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Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

et al. 2009

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“…In terms of the influence of slag, it has been determined that its interparticle forces are stronger than those of Portland clinker particles [12]. However, the efficiency of SP on cement is increased with slag content, mainly due to the greater dispersing effect that slag particles have [2,13]. This higher efficiency of SP has also been confirmed by concrete workability with replacement ratios by slag of 15-20 % [14].…”

Section: Introductionmentioning

confidence: 73%

Efficiency of cement-admixture systems in mortars with binary and ternary Portland cements

Sosa¹,

Zaccardi²,

Peralta³

et al. 2018

DYNA

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Compared to conventional concrete, high-performance concrete production offers such benefits as greater ease of placement, smaller sections, improved finishing and higher strength and durability. For the design of these types of concretes, it is advisable to carry out studies on pastes or mortars in order to evaluate admixture -cementitious material compatibility. This evaluation entails verifying fresh state properties and evolution over time. The aim of this work is to evaluate the behavior of mortars made with different water reducers as well as binary and ternary cements, and their connection to the properties they acquire in hardened state. Fluidity in the fresh state and absorption, density and compressive strength in the hardened state were evaluated. The results show that the impact of superplasticizers is not restricted to the fresh state, as influence on the development of the degree of hydration and compacity can also be noticed.Keywords: cement; binary; ternary; superplasticizer; mortar; fluidity; compressive strength.Eficiencia de sistemas cemento-aditivo en morteros con cementos Portland binarios y ternarios Resumen La elaboración de hormigones de alta performance ofrece beneficios tales como mayor facilidad de colocación, secciones reducidas, mejoras en la terminación, mayor durabilidad y resistencia comparativamente con hormigones convencionales. Para el diseño de dichos hormigones, es aconsejable realizar estudios en pastas o morteros para evaluar la compatibilidad aditivo reductor de agua-material cementiceo. Dicha evaluación implica la verificación de propiedades del estado fresco y su evolución en el tiempo. El objetivo de este estudio consiste en evaluar el comportamiento de diferentes sistemas aditivo reductor de agua-cemento en morteros elaborados con diferentes cementos binarios y ternarios y su conexión con las propiedades del estado endurecido. La fluidez en estado fresco, densidad, absorción y resistencia a compresión en estado endurecido fueron evaluadas. De los resultados obtenidos surge que la influencia de los superplastificantes no es restringida al estado fresco, observándose también influencia en el desarrollo del grado de hidratación y en la compacidad.

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“…Resultados similares se han referido en trabajos previos (34). Esto parece indicar que la escoria (presente en un contenido superior al 70% en estos cementos) adsorbe parte del aditivo, produciéndose una repulsión tanto entre las partículas de escoria, como entre los granos de cemento.…”

Section: Discussionunclassified

Influencia de la estructura de aditivos basados en policarboxilato sobre el comportamiento reológico de pastas de cemento

Alonso¹,

Palacios²,

Puertas³

et al. 2007

Mater. construcc.

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Influencia de aditivos basados en policarboxilatos sobre el fraguado y el comportamiento reológico de pastas de cemento portland

Cited by 23 publications

References 0 publications

Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

Efficiency of cement-admixture systems in mortars with binary and ternary Portland cements

Influencia de la estructura de aditivos basados en policarboxilato sobre el comportamiento reológico de pastas de cemento

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