Effect of some chemical admixtures on the physico-chemical and rheological properties of oil well cement pastes

•Effect of some admixtures on the properties of oil well cement paste was studied.•All admixtures were effective in decreasing the water of standard consistency.•The chemically combined water and the compressive strength were studied.•The mini-slump values for all admixed cement slurries were determ...

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Published in:Construction & building materials 2016-09, Vol.120, p.80-88
Main Authors: Habib, A.O., Aiad, I., Youssef, T.A., Abd El-Aziz, A.M.
Format: Article
Language:English
Subjects:
Analysis
Cement
Chemical admixtures
Chemical properties
Compressive strength
Diffraction
Gel/space ratio
Mechanical properties
Mini slump test
Oil well cement
Rheology
X-ray diffraction
X-rays
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cited_by cdi_FETCH-LOGICAL-c529t-38d77c5fcf399b9f63a6576a25cf260ee995dfbf351c7bc3d1239b4afdd4bebc3
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container_title Construction & building materials
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creator Habib, A.O.
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description •Effect of some admixtures on the properties of oil well cement paste was studied.•All admixtures were effective in decreasing the water of standard consistency.•The chemically combined water and the compressive strength were studied.•The mini-slump values for all admixed cement slurries were determined.•The phase composition of hydration products were studied using X-ray diffraction.•The microstructure for the all cement pastes were examined using SEM. In this work the effect of the prepared melamine formaldehyde sulfanilate (MFS) and cyclohexanone formaldehyde sulfonate (CFS) on the physico-chemical properties of oil well cement was investigated. The chemically combined water content, compressive strength, gel/space ratio and degree of hydration for each paste at different time intervals (1, 3, 7, 28 and 90days) were determined. The rheological properties were determined using mini slump test. The morphology of cement pastes and the phase composition of the hydrated products were investigated using scanning electron microscope and X-ray diffraction analyses. The results showed clearly that as the dosage of admixtures increases, the water of standard consistency decreases, this leads to a decrease in the total porosity of the cement pastes, and consequently the compressive strength value increases. Also as the admixture dosage increases, adsorption of their particles on the cement particles increases, so the negative charge on cement particles increases leading to more repulsion between them which enhances the rheological properties of cement pastes. The X-ray diffraction and scanning electron microscopy analyses indicated that the main hydration products formed are nearly amorphous calcium silicate hydrates, calcium sulphoaluminate hydrates (ettrringite and monosulfate hydrates) and portlandite (CH).
doi_str_mv 10.1016/j.conbuildmat.2016.05.044
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source ScienceDirect Freedom Collection 2022-2024
subjects Analysis
Cement
Chemical admixtures
Chemical properties
Compressive strength
Diffraction
Gel/space ratio
Mechanical properties
Mini slump test
Oil well cement
Rheology
X-ray diffraction
X-rays
title Effect of some chemical admixtures on the physico-chemical and rheological properties of oil well cement pastes
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