Blast furnace slags (BFS) and pulverised fly ash (PFA) have been extensively used as additives to Ordinary Portland Cement (OPC) to make low permeability pastes with adequate long-term strengths. These properties are a consequence of phase development in the matrix which proceeds non-unformly because the OPC clinker and blending agent react at different rates. Also, sheaths of hydration products forming around anhydrous grains inhibit reaction. This complicates our interpretation of the properties of blended cement systems because phases which are observed as products on laboratory timescales are not necessarily representative of the steady state assemblages. The aqueous chemistry is also subject to time dependent changes since solution composition is related to that of the coexisting solids, In some applications, e.g. radioactive waste immobilisation, it is necessary to predict long term physico-chemical properties. This can only be achieved through modelling, based on sound scientific principles and using as much information as it is realistic to obtain from immature systems. The present paper describes progress in respect of model development and verification.
|Title of host publication||Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete|
|Subtitle of host publication||Proceedings - 3rd International Conference|
|Publisher||American Concrete Institute|
|Number of pages||23|
|Publication status||Published - 1 May 1989|
|Event||3rd International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete - Trondheim, Norway|
Duration: 18 Jun 1989 → 23 Jun 1989
|Name||American Concrete Institute, ACI Special Publication|
|Conference||3rd International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete|
|Period||18/06/89 → 23/06/89|
Bibliographical noteFunding Information:
F.P. Glasser is Professor of Inorganic Chemistry at the University of Aberdeen where he leads a team of research workers engaged in studies relating to the immobilisation of radioactive wastes in cement-based matrices. Drs Macphee and Atkins are Research Fellows and members of this research group which is supported by grants from the UK Department of the Environment and the Commission for the European Communities.
© 1989 American Concrete Institute. All rights reserved.
- Blast furnace slag
- Blended cements
- Chemical analysis
- Compressive strength
- Fly ash