Superplasticizers

Ramachandran, V.; Malhotra, V. M.

doi:10.1016/b978-081551373-5.50011-8

Cited by 26 publications

(20 citation statements)

References 29 publications

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“…[2][3][4] Sulfonated naphthalene formaldehyde and sulfonated melamine formaldehyde polycondensates are two typical superplasticizers used commercially in construction applications. 5 In oil well cementing, acetone-formaldehyde-sulfite (AFS) polycondensate is preferred because of its superior effectiveness in salt slurries. 6 Adsorption of these anionic additives on the positive surface areas of hydrating cement creates negatively charged particles.…”

Section: Introductionmentioning

confidence: 99%

Modification of the molar anionic charge density of acetone–formaldehyde–sulfite dispersant to improve adsorption behavior and effectiveness in the presence of CaAMPS®‐co‐NNDMA cement fluid loss polymer

Plank

Dugonjic-Bilic

Lummer

2008

J of Applied Polymer Sci

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Sulfonated aldol polycondensates were synthesized from acetone, formaldehyde, and different amounts of sodium sulfite, resulting in polymers with varying degrees of sulfonation (DS). The anionic charge amount of these macromolecules measured by polyelectrolyte titration decreased with lower DS. The effectiveness of the acetone-formaldehyde-sulfite (AFS) polycondensates as cement dispersant was found to depend on the amount of polymer adsorbed on cement. AFS adsorption decreases with lower DS. Interaction and compatibility between AFS and CaAMPS V V R -co-NNDMA fluid loss additive was studied by formulating binary additive systems composed of one of the modified AFS polymers and CaAMPS-co-NNDMA. At high DS, AFS adsorbs strongly and prevents CaAMPS-co-NNDMA from adsorbing in sufficient amounts on the cement surface. The result is poor fluid loss control of the cement slurry. AFS polymers with lower DS, however, allow simultaneous adsorption of both polymers in sufficient quantities to provide good fluid loss control and low rheology at the same time. Thus, effectiveness of both additives was retained. Obviously, effectiveness of such multiadmixture systems depends on the adjustment of the adsorption behavior of the individual components relative to each other. Molar anionic charge density of the polymers was found to be a major parameter influencing their relative adsorption behavior. The AFS polymer with DS ¼ 0.2 possesses a molar anionic charge density comparable to CaAMPS-co-NNDMA. Thus, when admixtures with similar molar anionic charge densities are used, the performance of one component is not negatively influenced by the other.

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Section: Introductionmentioning

confidence: 99%

Modification of the molar anionic charge density of acetone–formaldehyde–sulfite dispersant to improve adsorption behavior and effectiveness in the presence of CaAMPS®‐co‐NNDMA cement fluid loss polymer

Plank

Dugonjic-Bilic

Lummer

2008

J of Applied Polymer Sci

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“…El componente más importante del cemento es el C 3 A, que puede ser altamente reactivo y sobre el que se adsorbe el SP en proporciones elevadas (4). El aluminato tricálcico desempeña un papel fundamental, sobre todo en el caso de los superplastificantes que contienen grupos sulfonatos (4).…”

Section: Introductionunclassified

“…Ramachandran (4) y Aïtcin (3) comprobaron que el mecanismo de la reacción del C 3 A consiste en la quimisorción de aniones de RSO 3 -sobre los sitios activos de la superficie del C 3 A. Los aniones de SO 3 -compiten en dicha quimisorción con los iones de SO 4 -2 procedentes de la disolución de sulfatos, que pueden ser alcalinos o de calcio. Bonen y Sarkar (6) observaron también una buena correlación entre la adsorción del superplastificante y el producto resultante de multiplicar la fracción de C 3 A por la superficie específica del cemento.…”

Section: Introductionunclassified

Influencia de la naturaleza del cemento en la compatibilidad con aditivos superplastificantes basados en carboxilatos

Bundyra-Oracz¹,

Kurdowski²

2011

Mater. construcc.

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“…These factors jointly or individually having a fastening effect on the initial setting time of cement which negatively affects the workability and makes it impossible to pump as a result of the coming down of the cement deep into the ground and this process may take several hours. So begin the use of chemical mixtures (3) , such as superplasticizers, which work to increase fluidity and to facilitate the process of pumping cement slurries to the depths of wells easily with no changing in the cement properties (4) . Strong repulsion happens because the superplasticizer and the cement particle's charge by a similar charge (5) .…”

Section: Effect Of Some Prepared Superplasticizers (Cyclohexanonementioning

confidence: 99%

Effect of Some Prepared Superplasticizers (Cyclohexanone Based) on Compressive Strength and Physico-chemical Properties of Oil Well Cement Pastes

2016

Egypt. J. Chem.

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TWO different superplasticizers particularly Cyclohexanone formaldehyde sulfanilate (CFS) and Cyclohexanone glyoxylic sulfanilate (CGS) were prepared; also, their effect on mechanical and physico-chemical properties of oil well cement was assessed. The chemical structures were affirmed by FTIR technique. The designed chemical compounds were predestined as superplasticizers for cement pastes. The pastes made by superplasticizers (CFS or CGS) addition to cement by the ratios of 0, 0.25, 0.50, 0.75, and l.00 as mass % of cement. The consistence water, setting time, chemically combined water content (Wn), the hydration rate and compressive strength of the admixed hardened pastes were predestined at various time periods. The phase composition was intended by DSC and XRD techniques. The results revealed that as the admixture dose rate increases the demand cement paste water of consistency decreases. Also, as the admixture addition rate increases the chemically combined water content decreases, so the rate of hydration decreases; meanwhile compressive strength magnitudes increase in accounts for the low water/cement (initial porosity) of the sample.The factors affecting the cementing process of oil wells are the temperature, pressure, minerals, impurities and the water/cement ratio (1,2) . These factors jointly or individually having a fastening effect on the initial setting time of cement which negatively affects the workability and makes it impossible to pump as a result of the coming down of the cement deep into the ground and this process may take several hours. So begin the use of chemical mixtures (3) , such as superplasticizers, which work to increase fluidity and to facilitate the process of pumping cement slurries to the depths of wells easily with no changing in the cement properties (4) . Strong repulsion happens because the superplasticizer and the cement particle's charge by a similar charge (5) . Given the large molecular weight of superplasticizers, the plasticizers are also working as pore fillers between the particles of cement which reduces the water/cement ratio and therefore gives a high magnitude compressive strength (6)(7)(8)(9) . The synthesis processing parameter of water soluble sulfonated cyclohexanone formaldehyde (SCF) superplasticizer has influence on the inherent viscosity and the dispersing

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Superplasticizers

Cited by 26 publications

References 29 publications

Modification of the molar anionic charge density of acetone–formaldehyde–sulfite dispersant to improve adsorption behavior and effectiveness in the presence of CaAMPS®‐co‐NNDMA cement fluid loss polymer

Modification of the molar anionic charge density of acetone–formaldehyde–sulfite dispersant to improve adsorption behavior and effectiveness in the presence of CaAMPS®‐co‐NNDMA cement fluid loss polymer

Influencia de la naturaleza del cemento en la compatibilidad con aditivos superplastificantes basados en carboxilatos

Effect of Some Prepared Superplasticizers (Cyclohexanone Based) on Compressive Strength and Physico-chemical Properties of Oil Well Cement Pastes

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