The characterization of hardened alkali-activated blast-furnace slag pastes and the nature of the calcium silicate hydrate (C-S-H) phase

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Cement and Concrete Research; (United States)

DOI:https://doi.org/10.1016/0008-8846(94)90002-7· OSTI ID:7024662

Richardson, I G; Brough, A R; Groves, G W; Dobson, C M ^[1]

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1. Univ. of Oxford (United Kingdom)

Calcium silicate hydrate (C-S-H) gel is the principal binding phase in hardened OPC pastes and concretes, and also when the OPC has been partially replaced by pozzolanic by-products such as ground granulated blast-furnace slag (GGBFS) and pulverized fuel ash. The C-S-H gels present in commercial blast-furnace slag and synthetic-slag glass pastes produced by hydrating with 5M KOH solution have been studied by a combination of transmission electron microscopy (TEM) and [sup 29]Si and [sup 27]Al nuclear magnetic resonance (NMR) spectroscopy. They are related by both composition and morphology to the C-S-H gels present in slag-OPC paste but are more crystalline. The inner product C-S-H is intermixed on a fine scale with a Mg,Al-rich phase with a Mg/Al ratio of [approximately]2.5. The C-S-H in both inner and outer product contains substituted Al in tetrahedral co-ordination sites. The data are analyzed in terms of a model for the structure of C-S-H gel.

• OSTI ID: 7024662
• Journal Information: Cement and Concrete Research; (United States), Journal Name: Cement and Concrete Research; (United States) Vol. 24:5; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
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36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM
BINDERS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM SILICATES
CEMENTS
ELEMENTS
HYDRATES
MAGNESIUM
MATERIALS
METALS
MORPHOLOGY
OXYGEN COMPOUNDS
PHASE STUDIES
PORTLAND CEMENT
SILICATES
SILICON COMPOUNDS
SLAGS
WASTE PRODUCT UTILIZATION