Nanoindentation characteristics of calcium hydroxide-metakaolin blended with sodium hydroxide solutions

被引：4

作者：

He Zhihai ^{[1
,2
]}

Qian Chunxiang ^{[1
,2
]}

Zhang Yi ^{[1
,2
]}

Zhao Fei ^{[1
,2
]}

机构：

[1] Southeast Univ, Coll Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China

[2] Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China

来源：

JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2014年 / 29卷 / 01期

关键词：

nanoindentation; metakaolin; calcium hydroxide; C-S-H gel; elastic modulus;

D O I：

10.1007/s11595-014-0890-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to determine the active mechanism of metakaolin (MK) as partial replacement of cement in concrete from the nanoscale structure perspective, nanoindentation characteristics of calcium hydroxide (CH)-MK blended with 5 M sodium hydroxide (NaOH) solutions simulating the condition of MK in concrete has been studied. The results indicate that three distinct phases are found by the nanoindentation and BSE tests, such as HD C-S-H gel, LD C-S-H gel and the reaction products with the network structure, the residual unreacted MK and CH, respectively. The volume fraction of HD C-S-H gel is about 96% of all reaction product phases. This means that the use of MK in concrete can increase the volume fraction of HD C-S-H gel and thus will improve the properties of concrete.

引用

页码：185 / 189

页数：5

共 17 条

[1] Composition and density of nanoscale calcium-silicate-hydrate in cement [J].

Allen, Andrew J. ;

Thomas, Jeffrey J. ;

Jennings, Hamlin M. .

NATURE MATERIALS, 2007, 6 (04) :311-316

[2] Calorimetric study of alkaline activation of calcium hydroxide-metakaolin solid mixtures [J].

Alonso, S ;

Palomo, A .

CEMENT AND CONCRETE RESEARCH, 2001, 31 (01) :25-30

[3] A Coupled Nanoindentation/SEM-EDS Study on Low Water/Cement Ratio Portland Cement Paste: Evidence for C-S-H/Ca(OH)2 Nanocomposites [J].

Chen, Jeffrey J. ;

Sorelli, Luca ;

Vandamme, Matthieu ;

Ulm, Franz-Josef ;

Chanvillard, Gilles .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2010, 93 (05) :1484-1493

[4] Grid indentation analysis of composite microstructure and mechanics: Principles and validation [J].

Constantinides, G. ;

Chandran, K. S. Ravi ;

Ulm, F-J. ;

Van Vliet, K. J. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 430 (1-2) :189-202

[5] The nanogranular nature of C-S-H [J].

Constantinides, Georgios ;

Ulm, Franz-Josef .

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2007, 55 (01) :64-90

[6] Influence of steam curing on the properties of concretes incorporating metakaolin and silica fume [J].

Gesoglu, Mehmet .

MATERIALS AND STRUCTURES, 2010, 43 (08) :1123-1134

[7]

Granizo ML, 2002, J AM CERAM SOC, V85, P225

[8] Composition and structure of C-S-H in white Portland cement-20% metakaolin pastes hydrated at 25 °C [J].

Love, C. A. ;

Richardson, I. G. ;

Brough, A. R. .

CEMENT AND CONCRETE RESEARCH, 2007, 37 (02) :109-117

[9] Comparative Study of the Effects of Microsilica and Nanosilica in Concrete [J].

Mondal, Paramita ;

Shah, Surendra P. ;

Marks, Laurence D. ;

Gaitero, Juan J. .

TRANSPORTATION RESEARCH RECORD, 2010, (2141) :6-9

[10] Nanoindentation characteristics of alkali-activated aluminosilicate materials [J].

Nemecek, Jiri ;

Smilauer, Vit ;

Kopecky, Lubomir .

CEMENT & CONCRETE COMPOSITES, 2011, 33 (02) :163-170

← 1 2 →