Retention of alkali ions by hydrated low-pH cements: Mechanism and Na+/K+ selectivity

被引：112

作者：

Bach, T. T. H. ^{[1
]}

Chabas, E. ^{[1
]}

Pochard, I. ^{[2
]}

Coumes, C. Cau Dit ^{[1
]}

Haas, J. ^{[2
]}

Frizon, F. ^{[1
]}

Nonat, A. ^{[2
]}

机构：

[1] Commissariat Energie Atom & Energies Alternat, DEN MAR DTCD SPDE, F-30207 Bagnols Sur Ceze, France

[2] Univ Bourgogne, CNRS, UMR 6303, ICB, F-21078 Dijon, France

来源：

CEMENT AND CONCRETE RESEARCH | 2013年 / 51卷

关键词：

Low-pH cement; Alkalis (D); C-S-H (B); X-ray diffraction (B); C-S-H; LOW-HEAT; SURFACE; SUSPENSIONS; RESISTANCE;

D O I：

10.1016/j.cemconres.2013.04.010

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Low-pH cements, also referred to as low-alkalinity cements, can be designed by replacing significant amounts of Portland cement by pozzolanic materials. Their pore solution is characterized by a pH near 11, and an alkali concentration much lower than that of Portland cement. This work investigates the retention of sodium and potassium by a hydrated low-pH cement comprising 60% Portland cement and 40% silica fume. It is shown that sorption of potassium is higher than that of sodium and mainly results from counterion charge balancing of the C-S-H negative surface charge. To explain the greater retention of potassium compared to sodium, it is postulated that potassium, unlike sodium, may enter the interlayer of C-S-H to compensate the negative charges in the interlayer, in addition to the external surfaces. This assumption is supported by structural characterization of C-S-H using X-ray diffraction. (c) 2013 Elsevier Ltd. All rights reserved.

引用

页码：14 / 21

页数：8

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