Relating the molecular structure of comb-type superplasticizers to the compression rheology of MgO suspensions

被引：79

作者：

Kjeldsen, Ane M.

Flatt, Robert J.

Bergstrom, Lennart ^{[1
]}

机构：

[1] Stockholm Univ, Arrhenius Lab, Dept Phys Inorgan & Struct Chem, Mat Chem Res Grp, SE-10691 Stockholm, Sweden

[2] Tech Univ Denmark, Dept Civil Engn, DK-2800 Lyngby, Denmark

[3] Sika Technol AG, CH-8048 Zurich, Switzerland

来源：

CEMENT AND CONCRETE RESEARCH | 2006年 / 36卷 / 07期

关键词：

rheology; superplasticizers; cement; suspensions; polymers;

D O I：

10.1016/j.cemconres.2006.03.019

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

We have investigated the effect of superplasticizers on the rheological properties of concentrated MgO suspensions. The comb-type anionic polymers with grafted polyethylene oxide chains adsorb onto the MgO surface and infer a steric repulsion where the range scales with the length of the PEO side chains. Consolidation experiments, where the volume fraction gradient of particle networks has been determined in response to a centrifugal force field, offer a simple, yet accurate, way of investigating flocculated, partly stabilized and stable suspensions under compression. The compression rheology behaviour could be related to the estimated thickness of the adsorbed superplasticizers and a scaling analysis was used to quantitatively assess the importance of the length of the grafted PEO-chains on the magnitude of the inter-particle bond strength. (C) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1231 / 1239

页数：9

共 32 条

[1]

[Anonymous], [No title captured]

[2] Micro total analysis systems. 2. Analytical standard operations and applications [J].

Auroux, PA ;

Iossifidis, D ;

Reyes, DR ;

Manz, A .

ANALYTICAL CHEMISTRY, 2002, 74 (12) :2637-2652

[3]

BANFILL PFG, 1991, P INT C LIV 1990 SPO

[4] Hamaker constants of inorganic materials [J].

Bergstrom, L .

ADVANCES IN COLLOID AND INTERFACE SCIENCE, 1997, 70 :125-169

[5] CONSOLIDATION BEHAVIOR OF FLOCCULATED ALUMINA SUSPENSIONS [J].

BERGSTROM, L ;

SCHILLING, CH ;

AKSAY, IA .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (12) :3305-3314

[6] SCALING BEHAVIOR OF THE RHEOLOGY OF AGGREGATE NETWORKS FORMED FROM COLLOIDAL PARTICLES [J].

BUSCALL, R ;

MILLS, PDA ;

GOODWIN, JW ;

LAWSON, DW .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1988, 84 :4249-4260

[7] Shear and compressive rheology of aggregated alumina suspensions [J].

Channell, GM ;

Zukoski, CF .

AICHE JOURNAL, 1997, 43 (07) :1700-1708

[8] Yodel: A yield stress model for suspensions [J].

Flatt, RJ ;

Bowen, P .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2006, 89 (04) :1244-1256

[9] Towards a prediction of superplasticized concrete rheology [J].

Flatt, RJ .

MATERIALS AND STRUCTURES, 2004, 37 (269) :289-300

[10] Dispersion forces in cement suspensions [J].

Flatt, RJ .

CEMENT AND CONCRETE RESEARCH, 2004, 34 (03) :399-408

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