Combined effect of mineral admixtures with superplasticizers on the fluidity of the blended cement paste

Hallal, Ahmed; Kadri, El-Hadj; Ezziane, Karim; Kadri, Abdelkader; Khelafi, H.

doi:10.1016/j.conbuildmat.2010.01.015

Cited by 69 publications

(32 citation statements)

References 14 publications

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“…We should note that A additive retards hydration process less than B additive. This may be because of reasons indicated by Hallal et al [15] that limestone additive in contrary to some big fineness additives not only reduces but also improves efficacy of some plasticizers.…”

Section: Resultsmentioning

confidence: 91%

“…Diverse plasticizers different in composition have been widely offered to the users, and concrete properties are significantly influenced by plasticizers incorporation. Researchers made several compatibility tests of cement with superplasticizers and tested rheology of the grout [14,15]. Mobility of a fresh cement mix and mortar may be influenced by many factors, related to Portland cement chemical and mineralogical composition and fineness, type of superplasticizers, amount, and temperature [16].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 91%

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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“…Although LSP does not possess pozzolanic property [3,4], its use in concrete offers many technical benefits, among which are: increase in early strength and bleeding control [4,5], improvement of the concrete workability and excellent densification of concrete microstructure [4][5][6]. Further, LSP improves the deformability and viscosity of SCC, as well as reduction in the porosity of SCC.…”

Section: Introductionmentioning

confidence: 94%

Properties of SCC prepared using natural pozzolana and industrial wastes as mineral fillers

Adekunle

Ahmad

Maslehuddin

et al. 2015

Cement and Concrete Composites

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“…Annually, millions of tons of cationic dyes are consumed by the textile, rubber, paper, and plastic industries (in which about 10-20% is discharged in wastewater effluents). [33] These dyes cover thousands of different chemical structures. Most of them exhibit recalcitrant properties, such as high hydrophilicity and stability to light or heat.…”

Section: Removal Of Dyesmentioning

confidence: 99%

Radiation-induced grafting of acrylamide and methacrylic acid individually onto carboxymethyl cellulose for removal of hazardous water pollutants

Ghaffar

El‐Arnaouty

Baky

et al. 2016

Designed Monomers and Polymers

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Carboxymethyl cellulose hydrogels were synthesized by grafting of acrylamide (AAm) and methacrylic acid (MAAc) individually with different concentrations onto carboxymethyl cellulose (CMC) using direct radiation grafting technique. It was found that for both Poly(CMC/AAm) and Poly(CMC/MAAc), the grafting yield and grafting ratio increase with the increasing monomer concentration. Also, it is noted that both grafting ratio and grafting yield of Poly(CMC/AAm) are higher than that of Poly(CMC/MAAc). The effect of different monomer concentrations on gel (%) and swelling behavior was studied. It is found that the increasing monomer concentration increases gel (%). For Poly(CMC/AAm) hydrogels, the swelling behavior decreases with increasing AAm concentration due to high crosslinking hydrogel formation, while as MAAc content increases, swelling behavior increases up to Poly(CMC/MAAc) 1:25 wt%. Swelling kinetics and diffusion mechanism indicate that the water penetration obeys non-Fickian transport mechanism. The structures and properties of the original CMC and the prepared Poly(CMC/MAAc) and Poly(CMC/AAm) were characterized using different analytical tools such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscope (SEM). This study provides a solution to the discharge of different pollutants from wastewater. The adsorption capacity of Poly(CMC/MAAc) and Poly(CMC/AAm) hydrogels toward heavy metals, Cu +2 and Co +2, dyes such as acid blue dye and methyl green, and organic contaminants such as 4-chlorophenol and 2,4-Dichlorophenoxy acetic acid has been investigated.

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Combined effect of mineral admixtures with superplasticizers on the fluidity of the blended cement paste

Cited by 69 publications

References 14 publications

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

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

Properties of SCC prepared using natural pozzolana and industrial wastes as mineral fillers

Radiation-induced grafting of acrylamide and methacrylic acid individually onto carboxymethyl cellulose for removal of hazardous water pollutants

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