Effects of reactivity of MgO expansive agent on its performance in cement-based materials and an improvement of the evaluating method of MEA reactivity

被引：60

作者：

Cao, Fengze ^{[1
]}

Miao, Miao ^{[2
]}

Yan, Peiyu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China

[2] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 187卷

基金：

中国国家自然科学基金;

关键词：

MgO expansive agent (MEA); Reactivity; Fluidity; Morphology; Expansion; Evaluation method; SHRINKAGE; CONCRETE; ETTRINGITE; ADMIXTURES;

D O I：

10.1016/j.conbuildmat.2018.07.198

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Determined by calcining temperature and duration, reactivity of MgO is a dominating role of the hydration and expansive properties of MgO expansive agent (MEA). In the present work, the characteristics of industrially produced MEA and the morphology of its hydration products were investigated with zeta potential analyzer (ZPA), Morphology G3 optical microscope and scanning electron microscope (SEM). The influence of activity and dosage of MEA on fluidity and expansive properties of shrinkage compensating binder was also investigated. Results indicated that the reactivity of industrially produced MEA is not a fixed value, but distributes in a range. The fluidity and expansive properties of binders containing MEA is affected by the reactivity and dosage of MEA. Besides, advantages and disadvantages of the standard evaluating method on reactivity of MEA were summarized. A new evaluating method of MEA reacting with ethylic acid buffer solution and weighing residue on the reactivity of MEA has been proposed. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：257 / 266

页数：10

共 23 条

[1]

[Anonymous], 2013, 52962013 DLT

[2]

Cao F., 2018, J CHIN CERAM SOC, P0454

[3]

[曹丰泽 Cao Fengze], 2017, [硅酸盐学报, Journal of the Chinese Ceramic Society], V45, P1088

[4]

Cao Z., 2003, DAM CONSTRUCTION TEC, P99

[5] MECHANISM OF EXPANSION OF CONCRETE DUE TO THE PRESENCE OF DEAD-BURNT CAO AND MGO [J].

CHATTERJI, S .

CEMENT AND CONCRETE RESEARCH, 1995, 25 (01) :51-56

[6]

Deng M., 1990, J NANJING I CHEM TEC, V12, P1

[7] Utilisation of light calcined magnesite tailings to compensate the autogenous shrinkage of steam-cured cement paste [J].

Ding, Wenwen ;

Tan, Kefeng ;

Liu, Laibao ;

Tang, Kaijing ;

Zhao, Cuijiao ;

He, Yongjia .

ADVANCES IN CEMENT RESEARCH, 2016, 28 (10) :675-686

[8]

Gagné R, 2016, WOOD PUBL SER CIVIL, V59, P441, DOI 10.1016/B978-0-08-100693-1.00022-9

[9]

Keith F R., 2006, Concrete International, V28, P47

[10] Surface charge density and electrokinetic potential of highly charged minerals:: Experiments and Monte Carlo simulations on calcium silicate hydrate [J].

Labbez, C ;

Jönsson, B ;

Pochard, I ;

Nonat, A ;

Cabane, B .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (18) :9219-9230

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