Slump loss control of cement paste by adding polycarboxylic type slump-releasing dispersant

Lim, Gye-Gyu; Hong, Seong-Su; Kim, Do-Su; Lee, Beom-Jae; Rho, Jae-Seong

doi:10.1016/s0008-8846(98)00188-4

Cited by 53 publications

(18 citation statements)

References 6 publications

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“…This action can be applied to all four types of SPs; SPs like NSF and AS contain benzene group, whose π electrons can be easily polarized by solid polar group and induce adsorption on solid surface. The result of higher adsorption amount of PCE in contrast to other types of SPs on β-C 2 S is not in accordance with the adsorption results reported on cement particles [11][12][13] . Along with the results of ζ-potential as shown in Fig.7, the result is reasonable from the fact that PCE is a type of non-ionic polymer dispersant, which means a weaker electrical repulsion force from β-C 2 S. The less adsorption amount of AS has something relation to its loose adsorption pattern, which is considered being adsorbed in "loop" mode [14] .…”

Section: The Adsorption Mechanism and Mode Ofcontrasting

confidence: 82%

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Wang

Zhao

Cui

2007

J. Wuhan Univ. Technol.

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The chemical structures of four types of superplasticizers(SPs)and their adsorptive behaviors on β-C 2 S were investigated. The adsorption properties of SPs on β-C 2 S were measured and the relationship between the adsorption quantity and the specifi c surface of β-C 2 S was analyzed. The experimental results show that the adsorption quantity increases with the surface area increase of β-C 2 S, but the adsorption quantity per surface area is similar, which means that the main adsorbent is β-C 2 S itself. Polycarboxylic ester (PCE) showed the highest adsorption amount on β-C 2 S, followed by β-naphthalene sulfonates (NSF) and formaldehyde-acetone condensates sulfonates (FAS), amino sulphonate (AS) showed the least adsorption amount on β-C 2 S. PCE affected the surface potential of β-C 2 S particles in water differently in comparison with other types of SPs. The adsorption capacity of SPs on β-C 2 S is determined by factors such as molecular structure, functional groups and molecular weight of SPs.

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Section: The Adsorption Mechanism and Mode Ofcontrasting

confidence: 82%

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Wang

Zhao

Cui

2007

J. Wuhan Univ. Technol.

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“…Moreover, SNF has an affinity for both the C 3 A in the cement and the amorphous silica and alumina in the burnt silt. For that reason, the cement pastes consumed much more SNF than PCE, a finding previously reported by the authors (41,42). Figures 10 and 11 clearly show that in pastes TM2 and BM2 the rheological parameters (shear stress and plastic viscosity) declined with rising superplasticiser dosage.…”

Section: Effect Of the Nature Of The Superplasticisersupporting

confidence: 71%

Reología y potencial zeta de pastas de cemento con lodos de embalse calcinados y escorias granuladas de horno alto

Safi¹,

Benmounah²,

Saidi³

2011

Mater. construcc.

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“…In order to optimize the important action of acrylic acid and maleic anhydride in the main chain, Lim et al [19] synthesized a block polycarboxylate superplasticizer by copolymerization of maleic anhydride and acrylic acid, then coordinated with the National Science Foundation (NSF). The performance of the plasticizer in terms of adsorbability and liquidity became better.…”

Section: Poly(maleic Anhydride) Plasticizer and Copolymerized Plasticmentioning

confidence: 99%

Research on synthesis and action mechanism of polycarboxylate superplasticizer

Guo

Lei

et al. 2007

Front. Chem. China

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The relationship between the structure and performance of polycarboxylate superplasticizer was analyzed. The respective functions of the structure units of the main and branched chains were discussed. The progress of synthesis and molecular structure design and synthesis of polycarboxylate superplasticizer were reviewed according to the difference in the structure unit of the main chain. Results indicated that their performance is related to the structure unit of the main and branched chains, as well as the position and species of functional groups. The polycarboxylate superplasticizer, which had suitable graft and block polymers of polyethylene glycol or polyoxyethylene, and a suitable sulfonic group, had small slump loss besides high water-reducing performance. On the other hand, the hydroxyl group at the end of the chain causes gelation easily. On the basis of the items mentioned above, as well as the source and cost of raw materials, esterification of polyethylene glycol and acrylic acid were first adopted using para-toluene sulfonic acid as catalyst, then polymerized with sodium sulfonate methacrylate. A certain amount of acrylic was added in order to regulate both the polymerization degree of the main chain and the ratio of carboxyl and sulfonic groups in the branched chain. As a result, the high performance superplasticizer has been synthesized (was obtained). The divergence of the cement plasma is about 200 mm when the addition amount of superplasticizer is 0.16%−0.20% of cement weight, and the ratio of the water and cement is 0.29.

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Slump loss control of cement paste by adding polycarboxylic type slump-releasing dispersant

Cited by 53 publications

References 6 publications

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Reología y potencial zeta de pastas de cemento con lodos de embalse calcinados y escorias granuladas de horno alto

Research on synthesis and action mechanism of polycarboxylate superplasticizer

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