29Si solid state NMR investigation of pozzolanic reaction occurring in lime-treated Ca-bentonite

被引：70

作者：

Pomakhina, Elena ^{[1
]}

Deneele, Dimitri ^{[1
,2
]}

Gaillot, Anne-Claire ^{[1
]}

Paris, Michael ^{[1
]}

Ouvrard, Guy ^{[1
]}

机构：

[1] Univ Nantes, Inst Mat Jean Rouxel IMN, CNRS, F-44322 Nantes 3, France

[2] UNAM, IFSTTAR, F-44332 Bouguenais, France

来源：

CEMENT AND CONCRETE RESEARCH | 2012年 / 42卷 / 04期

关键词：

C-S-H; CaO/lime; Pozzolanic reaction; NMR spectroscopy; Nucleation and growth; NUCLEAR-MAGNETIC-RESONANCE; S-H; MONTMORILLONITE DISSOLUTION; PORTLAND CEMENTS; LAYER SILICATES; CALCIUM; AL-27; ALKALI; ALUMINUM; KINETICS;

D O I：

10.1016/j.cemconres.2012.01.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Lime is widely used as additive to improve the mechanical properties of natural soil used in earthworks. However, the physico-chemical mechanisms involved are yet not well understood. In order to develop and optimize this treatment method, a better understanding of the interaction between lime and the minerals of the soils, in particular clay minerals, is required. In this study, Ca-bentonite was treated with 2, 5 and 10 wt.% of lime during 1 to 98 days. Modifications in the Si local environment were then monitored by solid state nuclear magnetic resonance to investigate the pozzolanic reaction. All the soil mineral phases contribute to the release of Si and to the pozzolanic reaction, with a rapid and total consumption of Si-polymorph and an exacerbated dissolution of montmorillonite. Mechanism of C-S-H formation, function of the Ca content in the system, was found to match the sorosilicate-tobermorite model described in cement systems. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：626 / 632

页数：7

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