Modification of the rate of formation and surface area of ettringite by polycarboxylate ether superplasticizers during early C3A-CaSO4 hydration

被引：89

作者：

Dalas, Florent ^{[1
,2
]}

Pourchet, Sylvie ^{[1
]}

Rinaldi, David ^{[2
]}

Nonat, Andre ^{[1
]}

Sabio, Serge ^{[2
]}

Mosquet, Martin ^{[2
]}

机构：

[1] Univ Bourgogne, CNRS, Lab Interdisciplinaire Carnot Bourgogne Physico C, UMR 6303, F-21178 Dijon, France

[2] Lafarge, Ctr Rech, F-38291 St Quentin Fallavier, France

来源：

CEMENT AND CONCRETE RESEARCH | 2015年 / 69卷

关键词：

NMR relaxometry; BET; Surface area; Ettringite; Admixture; CEMENT; ADSORPTION; NMR; MICROSTRUCTURE; RELAXATION; MECHANISMS; CHEMISTRY; RHEOLOGY; IMPACT; FORCES;

D O I：

10.1016/j.cemconres.2014.12.007

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Early C(3)A-CaSO4 hydration was studied in the presence of various amounts of two polycarboxylate ether superplasticizers differing in their grafting degree. Hydration and surface area developments were investigated by in-situ NMR relaxometry coupled with BET and DSC during the first 2 h after mixing. This study enables a quantitative comparison of the amount and the specific surface area of the ettringite precipitated along the C(3)A-CaSO4 hydration with or without PCE. The main effect of PCE is to strongly increase ettringite specific area for a variable period. These effects are clearly dependent on the PCE charge and dosage and are reduced when using delayed addition. In this context the NMR relaxometry technique is of particular interest because of its high sensitivity to ettringite and furthermore this in-situ method does not need preliminary preparation likely to damage structure or modify particle arrangement. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：105 / 113

页数：9

共 14 条

[1] Influence of Sulfates on Formation of Ettringite during Early C3A Hydration
Yang, Yong
Zhang, Qianqian
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MATERIALS, 2022, 15 (19)
[2] Influence of Polycarboxylate Superplasticizers with Different Functional Units on the Early Hydration of C3A-Gypsum
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MATERIALS, 2019, 12 (07):
[3] Investigation on the effect of NaOH and Ca(OH)2 on the early hydration of C3A-CaSO4·2H2O-H2O system
Kuei Suan Jen Hsueh Pao, 6 (635-642):
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OGAWA, K
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CEMENT AND CONCRETE RESEARCH, 1981, 11 (5-6) : 741 - 750
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Schmidt, Wolfram
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[6] C4A3SBAR HYDRATION, ETTRINGITE FORMATION, AND ITS EXPANSION MECHANISM .2. MICROSTRUCTURAL OBSERVATION OF EXPANSION
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CEMENT AND CONCRETE RESEARCH, 1982, 12 (01) : 101 - 109
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OGAWA, K
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CEMENT AND CONCRETE RESEARCH, 1982, 12 (02) : 247 - 256
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ADVANCES IN CEMENT RESEARCH, 2010, 22 (03) : 123 - 126
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Kishar, Essam A.
Hegazy, Wafaa S.
Ahmed, Doaa Abd El Monem
ADVANCES IN CEMENT RESEARCH, 2011, 23 (03) : 123 - 128
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S. Garrault
E. Finot
E. Lesniewska
A. Nonat
Materials and Structures, 2005, 38 (4) : 435 - 442

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