Characteristics of two types of C-S-H gel in hardened complex binder pastes blended with slag

The characteristics of C-S-H gel in hardened Portland cement pastes and complex binder pastes with ground granulated blast furnace slag were investigated with nanoindentation. The composition of C-S-H gel was analysed with SEM-EDS. The obtained results showed that the volume fraction of LD C-S-H gra...

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Bibliographic Details
Published in:Science China. Technological sciences 2013-06, Vol.56 (6), p.1395-1402
Main Authors: Liu, RengGuang, Han, FangHui, Yan, PeiYu
Format: Article
Language:English
Subjects:
Age
Binders
Calcium silicate hydrate
CSH凝胶
Engineering
Hydration
Pastes
Progress of Projects Supported by NSFC
SEM-EDS
Slags
Transformations
Volume fraction
体积分数
复合胶凝材料
硬化
类型
粒化高炉矿渣
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Summary:The characteristics of C-S-H gel in hardened Portland cement pastes and complex binder pastes with ground granulated blast furnace slag were investigated with nanoindentation. The composition of C-S-H gel was analysed with SEM-EDS. The obtained results showed that the volume fraction of LD C-S-H gradually reduced and the volume fraction of HD C-S-H increased with the prolongation of hydration age. Most of the C-S-H gel produced at later age was HD C-S-H. The volume fraction of HD C-S-H increased as the fraction of slag in complex binder pastes increased, suggesting that HD C-S-H was mainly in the hydration products of slag. The chemichal compositions of the two types of C-S-H gel were simlar, meaning that formation and transformation of the two types of C-S-H gel were not affected by their Ca/Si ratio.
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-013-5221-6