Interfacial transition zone in concrete : state-of-the-art by J.C. Maso

By J.C. Maso

A big cutting-edge record ready via RILEM Technical Committee 108 ICC. it's been written via a crew of best foreign specialists from the united kingdom, united states, Canada, Israel, Germany, Denmark, South Africa, Italy and France.


a tremendous cutting-edge record ready by way of RILEM Technical Committee 108 ICC. it's been written via a staff of major foreign specialists from the united kingdom, united states, Canada, Israel, Germany, Denmark, Read more...

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1(a) and (b). An SEM micrograph demonstrating this microstructure is shown in Fig. 2. Since the formation of the interfacial zone is influenced by bleeding effects, it is to be expected that its structure around the aggregate will not be uniform, with the highest porosity interfacial zone forming below the aggregate, and the lowest above it. This has been confirmed in quantitative studies of the microstructure (Hoshino, 1989), and is shown schematically in Fig. 3. The width of this zone can be estimated by various means, showing it to be in the range of 10 to 100 µ m.

Diamond), Prestressed Concrete Institute, Chicago, pp. 109–23. 46 CONCRETES Bentur, A. (1989a) Silica fume treatments as a means for improving the durability of glass fibre reinforced cements, ASCE Journal of Materials in Civil Engineering, Vol. 1, pp. 167–83. Bentur, A. (1989b) The role of the interface in controlling the performance of high quality cement composites, Advances in Cement Manufacture and Use, (ed. Gartner), Engineering Foundation, pp. 227–37. Bentur, A. (1990) Microstructure, interfacial effects and micromechanics of cementitious composites, Advances in Cementitious Materials, (ed.

This implies that in order to improve bond in these systems there is a need to modify the whole microstructure of the interfacial zone. Attempts to enhance bond strength by polymer treatment of the actual interface were not successful (Popovics, 1987) and this was attributed to the fact that debonding took place within the bulk of the transition zone, away from the actual interface. Therefore, treatments with mineral solutions or with silica fume, which apparently interact with greater volume of the cement paste matrix in the vicinity of the aggregate surface, are effective in enhancing bond.

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