The Effect of Sodium Sulfate on the Dispersion of Polycarboxylate Superplasticizer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.284 ◽

2011 ◽

Vol 80-81 ◽

pp. 284-287 ◽

Cited By ~ 1

Author(s):

Sheng Hua Lv ◽

Jian Ping Duan ◽

Rui Jun Gao

Keyword(s):

Zeta Potential ◽

Cement Paste ◽

Sodium Sulfate ◽

Carboxyl Groups ◽

Dispersal Ability ◽

Sulfonic Group ◽

Polycarboxylate Superplasticizer

The effect of sodium sulfate on the dispersion of polycarboxylate superplasticizer (PC) was studied in this paper. The study of fluidity of cement paste shown that the carboxyl groups did more to improve the fluidity of cement paste than the sulfonic groups, and a quick loss of fluidity was much more likely arisen by slufonic groups in PC comparing with the carboxyl groups. The methods of zeta potential and fluidity of cement paste were applied to investigate the dispersal ability of cement particles when different PC used in the present of different concentration of sodium sulfate. The result showed that the sulfonic group was more sensitive to sodium sulfate than carboxyl groups in PC.

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Study on Relationship between Structure and Properties of Polycarboxylate Superplasticizer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.43 ◽

2012 ◽

Vol 487 ◽

pp. 43-47

Author(s):

Sheng Hua Lv ◽

Di Li ◽

Qiang Cao

Keyword(s):

Acrylic Acid ◽

Zeta Potential ◽

Ethyl Ester ◽

Functional Groups ◽

Cement Paste ◽

Ethyl Acrylate ◽

Structure And Properties ◽

Polycarboxylate Superplasticizer ◽

Carboxylic Groups

A polycarboxylate superplasticizer (PCs) was synthesized by copolymerization of allyl polyoxyethylene ethers (APE), acrylic acid (AA), sodium methylallyl Sulfonate (SMAS) and ethyl acrylate (EA). The effect of functional groups and branch chain on PCs properties was investigated by the test of fluidity of cement paste, retardation performance and Zeta potential of cement particles. The results showed that carboxylic groups and ethyl ester groups can improve water reducing ratio and fluidity of cement paste, and the sulfonic groups has an important contributiion to retardation performance of PCs.

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Effect of Structure of Polycarboxylate Superplasticizer on Hydration of Cement in Early Period

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.24 ◽

2012 ◽

Vol 487 ◽

pp. 24-28

Author(s):

Jian Ping Duan ◽

Sheng Hua Lv

Keyword(s):

Cement Paste ◽

Setting Time ◽

Early Period ◽

The Other ◽

Side Chain ◽

Carboxyl Groups ◽

Structure Parameters ◽

Polycarboxylate Superplasticizer ◽

Hydrated Product ◽

Effect Of Structure

Effect of polycarboxylate superplasticizer (PCs) with different bond between side chain and truck chain on hydration of cement in early period was studied. The performance of PCs in concrete was investigated by setting time, TGA and SEM. PC-based superplasticizer with ester bonding between side chain and truck chain. Although they had the proximate structure parameters in density of side chain and absorption group (carboxyl groups), the setting time of cement paste was significantly different when different PCs were employed in the preparation of cement. Decomposing of this bond in alkali environment may lead to a shorter setting time. On the other hand, same difference in hydration production was observed in early period hydration of cement paste when two different PCs was incorporated, which indicated that the different bond structure in PCs affected the hydration of cement in a different manner. The result of SEM indicated that the morphological phase of hydrated product was different when PC was applied, this may be related with the different result in the TG and TGA

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What is the mechanism of the fiber effect on the rheological behavior of cement paste with polycarboxylate superplasticizer?

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.122542 ◽

2021 ◽

Vol 281 ◽

pp. 122542

Author(s):

Kun Zhang ◽

Lisha Pan ◽

Jiacheng Li ◽

Chang Lin

Keyword(s):

Cement Paste ◽

Rheological Behavior ◽

Polycarboxylate Superplasticizer

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Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Absorption on Large Bibulous Stone Powder

Materials ◽

10.3390/ma14112736 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2736

Author(s):

Zuiliang Deng ◽

Guimin Lu ◽

Lefeng Fu ◽

Weishan Wang ◽

Baicun Zheng

Keyword(s):

Infrared Spectroscopy ◽

Thermogravimetric Analysis ◽

Zeta Potential ◽

Mechanism Of Action ◽

Water Consumption ◽

Pore Volume ◽

High Water ◽

Hydrodynamic Diameter ◽

Coarse Aggregates ◽

Polycarboxylate Superplasticizer

The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.

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Effect of Dispersant on the Measurement of Particle Size Distribution of Titanium Dioxide

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.261 ◽

2012 ◽

Vol 512-515 ◽

pp. 261-264

Author(s):

Li Shen ◽

Jin Hu ◽

Da Ping Wu

Keyword(s):

Particle Size ◽

Titanium Dioxide ◽

Zeta Potential ◽

Particle Size Distribution ◽

Size Distribution ◽

Anionic Surfactant ◽

Sodium Sulfate ◽

Aqueous Media ◽

Rutile Tio2 ◽

Tio2 Particles

As anionic surfactant, a commercial salt of lauryl sodium sulfate was used. The effects of different amounts of dispersant on the measurement of particle size distribution between two titanium dioxide powders (anatase and rutile) in aqueous media were discussed. Diluted aqueous suspensions were characterized in terms of particle size distribution and zeta potential. The results demonstrate that the measurement of particle size distribution strongly depends on the amounts of dispersant. The amounts of dispersant have a significant effect on the behavior of the rutile-TiO2 particles. The particle size first decreases significantly with an increase in the amounts of dispersant and then lesser increases with a further increase in the amounts of dispersant. The tendency show significant differences between two particles.

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How does adsorption behavior of polycarboxylate superplasticizer effect rheology and flowability of cement paste with polypropylene fiber?

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2018.11.003 ◽

2019 ◽

Vol 95 ◽

pp. 228-236 ◽

Cited By ~ 10

Author(s):

Kun Zhang ◽

Lisha Pan ◽

Jiacheng Li ◽

Chang Lin ◽

Yang Cao ◽

...

Keyword(s):

Cement Paste ◽

Polypropylene Fiber ◽

Adsorption Behavior ◽

Polycarboxylate Superplasticizer

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X-Ray Microtomography of an Astm C109 Mortar Exposed to Sulfate Attack

MRS Proceedings ◽

10.1557/proc-370-77 ◽

1994 ◽

Vol 370 ◽

Cited By ~ 14

Author(s):

D.P. Bentz ◽

Nicos. S. Martys ◽

P. Stutzman ◽

M. S. Levenson ◽

E.J. Garboczi ◽

...

Keyword(s):

Cement Paste ◽

Sodium Sulfate ◽

Three Dimensional ◽

Sulfate Solution ◽

Sulfate Attack ◽

Sodium Sulfate Solution ◽

Mortar Sample ◽

Air Voids ◽

X Ray ◽

Dimensional Image

AbstractX-ray microtomography can be used to generate three-dimensional 5123 images of random materials at a resolution of a few micrometers per voxel. This technique has been used to obtain an image of an ASTM C109 mortar sample that had been exposed to a sodium sulfate solution. The three-dimensional image clearly shows sand grains, cement paste, air voids, cracks, and needle-like crystals growing in the air voids. Volume fractions of sand and cement paste determined from the image agree well with the known quantities. Implications for the study of microstructure and proposed uses of X-ray microtomography on cement-based composites are discussed.

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