Compatibility between superplasticizer admixtures and cements with mineral additions

Burgos-Montes, Olga; Palacios, Marta; Rivilla, Patricia; Puertas, Francisca

doi:10.1016/j.conbuildmat.2011.12.092

Cited by 188 publications

(74 citation statements)

References 45 publications

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“…Seventy per cent less PCE than BNS was adsorbed by CEM I (plateau values = 5.99 and 19.40 mg polymer/g cement, respectively). These results are consistent with earlier findings, according to which cement adsorbed BNS and PMS (melanin derivative) admixtures more readily than polycarboxylate ether-based superplasticisers (11,42,43).…”

Section: Adsoption Isotherms For Cem I and Sands In Watersupporting

confidence: 83%

“…Despite the negative zeta potential, PCE may absorb on to sand particles. Given the large specific surface of the sand, physical adsorption may have also taken place (11). Lastly, as mentioned earlier, part of admixture PCE may have been interlayered in the clay structure, raising its consumption.…”

Section: Adsoption Isotherms For Sands In Cement Pore Solutionmentioning

confidence: 99%

“…In cements and additions, a higher specific surface and consequently greater fineness has been shown to raise the amount of admixture adsorbed (11,39,44).…”

Section: B) Sand Specifi C Surfacementioning

confidence: 99%

“…Admixturerelated factors such as formulation and structure, molecular weight, charge density and ether chain length, together with cement characteristics such as C 3 A, sulfate and alkali content, fineness, the presence of additions and mineralogical composition, are known to impact compatibility (4)(5)(6)(7)(8)(9)(10)(11)(12)(13).…”

Section: Introductionmentioning

confidence: 99%

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PCE and BNS admixture adsorption in sands with different composition and particle size distribution

et al. 2017

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ABSTRACT:The choice of a superplasticiser (SP) for concrete is of great complexity, as it is well known that properties of the end product are related to admixture and its compatibility with concrete components. Very few studies have been conducted on the compatibility between SPs and the sand of mortars and concretes, however. Practical experience has shown that sand fineness and mineralogical composition affect water demand and admixture consumption. Clay-containing sand has been found also to adsorb SPs, reducing the amount available in solution for adsorption by the cement. This study analysed the isotherms for PCE and BNS superplasticiser adsorption on four sands with different fineness and compositions commonly used to prepare mortars and concretes. BNS-based SP did not adsorb on sands, while PCE-based admixtures exhibited variable adsorption depending on different factors. The adsorption curves obtained revealed that the higher the sand fineness, the finer the particle size distribution and the higher the clay material, the greater was PCE admixture adsorption/ consumption. RESUMEN: Adsorción de aditivos PCE y BNS en arenas con diferente composición y distribución de tamaño departículas. La elección de un superplastificante (SP) para el hormigón es un proceso complejo, ya que las propiedades del producto final se relacionan con la naturaleza del aditivo y su compatibilidad con los componentes del hormigón. Sin embargo hay pocos estudios sobre la compatibilidad entre los SPs y arenas utilizadas en morteros y hormigones. En la práctica se ha demostrado que la finura y la composición mineralógica de la arena afectan a la demanda de agua y al consumo de SPs. Las arcillas que pueden encontrarse en las arenas pueden también adsorber aditivos, reduciendo la cantidad disponible en solución para la adsorción por el cemento. Se han analizado las isotermas de adsorción para SPs de tipo PCE y BNS en cuatro arenas de diferente finura y composicion comúnmente utilizado para preparar morteros y hormigones. El aditivo BNS no se adsorbe en las arenas, mientras que los PCE mostraron adsorción variable. Las curvas de adsorción revelaron que cuanto mayor es la finura de arena, menor la distribución del tamaño de partícula y mayor el contenido de arcilla mayor era adsorción/intercalación de aditivos PCE en las arenas.

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Section: Adsoption Isotherms For Cem I and Sands In Watersupporting

confidence: 83%

Section: Adsoption Isotherms For Sands In Cement Pore Solutionmentioning

confidence: 99%

“…In cements and additions, a higher specific surface and consequently greater fineness has been shown to raise the amount of admixture adsorbed (11,39,44).…”

Section: B) Sand Specifi C Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PCE and BNS admixture adsorption in sands with different composition and particle size distribution

et al. 2017

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“…Cement system fluidity can be determined from physical parameters, such as viscosity or yield stress measured with viscometers or rheometers. Many authors have studied Portland cement paste rheology as a preliminary to determining the rheology of the respective mortars and concretes [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Rheology of Cementitious Materials: Alkali-Activated Materials or Geopolymers

et al. 2018

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Abstract.A clear alternative to reach the goal of sustainable development in the Construction Sector is the development of alternative building materials to Ordinary Portland Cement (OPC) in a more energetically as well as environmentally eco-efficient way. Alkaline cements (Alkali-Activated Materials, AAMs) and geopolymers meet these requirements; and they are based on the alkali activation of aluminosilicates (mainly waste and industrial by-products, such as blast furnace slag, fly ash and ceramic waste) in highly alkaline solutions. AAMs cements and concretes are notable for being very durable and mechanically resistant. However, to date their rheological behaviour is not well controlled and there is little understanding of it, with very disparate experimental data. Despite this, their rheological behaviour is not fully understood and little is known on the disparate data obtained in AAM pastes. Moreover, the common additives used in the preparation of OPC concretes and the rheology modifiers/controllers are also unstable in the AAMs systems. Understanding and controlling the rheology of the AAMs systems will ultimately determine whether they can be implemented in the market, and will open up greater competitive possibilities in a crisis-affected sector. A systematic study of the factors that affect the rheological properties of AAMs (pastes, mortars and concretes) is therefore necessary in order to ultimately develop more resistant and durable materials.

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Dilatancy mitigation of cement powder paste by pozzolanic and inert fillers

Lai

Binhowimal

Hanžič

et al. 2020

Structural Concrete

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Third generation polycarboxylate‐based superplasticiser (SP) can easily extend the maximum concurrent design limits of strength and flowability of concrete or cement paste, but simultaneously creates unfavorable dilatancy (or shear thickening) that decreases mixing efficiency and pumping range of concrete. The dilatancy is created initially by clustering of free and adsorbed polymers of SP, but further addition of SP can conversely mitigate the dilatancy by improved wet packing density. Because of the negative correlation of packing density and dilatancy, it is believed that partial replacement of cement by finer pozzolanic or inert filler can decrease the dilatancy via improved filling effect. Herein, the dilatancy of cement powder paste with or without pozzolanic fly ash or inert limestone powder replacing partial cement was studied using a coaxial rheometer. The results revealed that there exists a threshold limit of SP, beyond which the effect on dilatancy reverses. At a given SP dosage, partial cement replacement by either filler decreases dilatancy via improved packing density up to an optimal ratio, after which the dilatancy increases because the packing density reverses.

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Compatibility between superplasticizer admixtures and cements with mineral additions

Cited by 188 publications

References 45 publications

PCE and BNS admixture adsorption in sands with different composition and particle size distribution

PCE and BNS admixture adsorption in sands with different composition and particle size distribution

Rheology of Cementitious Materials: Alkali-Activated Materials or Geopolymers

Dilatancy mitigation of cement powder paste by pozzolanic and inert fillers

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