Interfacial Transition Zone in Concrete (RILEM Reports) by J.C. Maso

By J.C. Maso

A tremendous new cutting-edge record ready by way of RILEM Technical Committee 108 ICC. it's been written by way of a workforce of top overseas specialists from the united kingdom, united states, Canada, Israel, Germany, Denmark, South Africa, Italy and France. study stories over contemporary years within the box of cement technological know-how have keen on the behaviour of the interfaces among the elements of cement-based fabrics. The recommendations utilized in different parts of fabrics technological know-how are being utilized to the complicated fabrics present in cements and concretes, and this e-book offers an important survey of the current cutting-edge.

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Zimbelmann demonstrated the effectiveness of surface treatments in reducing the thickness of the interfacial zone (use of surface active agents to reduce the thickness of the water film in the fresh mix), or in promoting reactions which improve physical and chemical bond by reacting mainly with the CH of the interfacial zone (solutions of water glass and pozzolans, for example). Such treatments can lead to a dramatic improvement in bond strength. At the age of one year some of the treated aggregate exhibited bond strength greater than the paste strength (Zimbelmann, 1987).

Mindess), American Ceramic Society , pp. 169–84. F. (1986) The effect of sand/cement ratio and silica fume on the microstructure of mortar, Cement and Concrete Research, Vol. 16, pp. 31–9. , Marchese, B. and Sersale, R. (1986) Microcracking propagation in flexural loaded Portland and high slag cement concretes, Proceedings of the 8th International Congress on the Chemistry of Cement, Rio de Janeiro, Vol. 3, pp. 478–84. Goldman A. and Bentur, A. (1989) Bond effects in high strength silica fume concretes, ACI Materials Journal, Vol.

DEVELOPMENT AND NATURE OF INTERFACIAL MICROSTRUCTURE 37 Fig. 15 Microstructure of 28-day-old GRC composite showing very little growth of hydration products between the filaments (after Bentur, 1986a). Fig. 16 The spaces between filaments in an aged AR GRC composite (CemFIL-1), showing growth of dense and massive CH crystals (after Bentur, 1986a). Cellulose-cement composites may change their properties over time. It was suggested that densification of the interfacial microstructure over time can transform the failure mode from pull-out to fibre fracture, thus leading to loss of toughness (Bentur and Akers, 1989; Davies, Campbell and Coutts, 1981).

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