By Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)

ISBN-10: 1461583128

ISBN-13: 9781461583127

ISBN-10: 1461583144

ISBN-13: 9781461583141

The construction explosion throughout the years 1945-1960 will unavoidably bring about elevated demolition within the subsequent many years because the lifetime distribution of buildings not fulfills its practical social necessities in an appropriate manner. within the development interval pointed out there has been a good elevate in strengthened and prestressed concrete building. accordingly there's now a growing number of concrete to be demolished. more and more critical calls for can be made upon demolition know-how, together with the call for for human- and environment-friendly suggestions. however, the potential of taking out particles through dumping is gradually diminishing, specifically with reference to significant towns and customarily in international locations with a excessive inhabitants density. even as in such international locations and in such city components a scarcity of aggregates for making concrete will boost because of regulations on mixture operating due to its impression at the atmosphere and due to the unavailability of mixture deposits as a result of city improvement. From the foregoing it follows that recycling and re-use of surroundings- and human-friendly demolished and fragmented construction rubble could be thought of. the interpretation of this normal challenge into phrases of fabrics technology is feasible via forming transparent principles of adhesion and unity: the full technique of demolition, fragmentation, and recycling or re-use of concrete is to damage the bonding forces among atoms and molecules and to shape new bonds around the interfaces of varied debris of both an identical nature or a distinct nature.

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12. UTI-CISCO Seminaire La Fragmentation - Dec. -Remy-Les-Chevreuse (Proceedings still in the press) 13. P. Meric - Influence of grinding and storage conditions of clinker - 7th International Congres on the Chemistry of Cement, Paris 1980, Vol I, pp. 4/1 - 4/16. 14. C. Westwood - Tewksbury lecture: Control and application of environment - sensitive fracture processes - Journal of Material Science 9 (1974) p. F. Neerhoff ~ Energetisch voordeliger fragmentatie van beton voor recycling doeleinden (energy efficient fragmentation of concrete for recycling purposes) ,Report ML 79-4, Laboratory of Material Science, Eindhoven University of Technology, Aug.

This is not unexpected since the irregular shapes of the cement grains or the aggregate particles and the differences in modulus between the HCP and the aggregate will induce high stress concentrations from which cracks will develop. Moreover there will be strength variations within the composite, especially close to the interface between the aggregate and the matrix. If sufficient energy is available the cracks may propagate rapidly through the solid and brittle failure occurs. dcnxQ 101 Fig. 4 Relationship between crack development and volumetric strain (Newman and Newman 1971) THE STRUCTURE OF CONCRETE: A MACROSCOPIC VIEW 49 likely that when the initial cracks are formed they will not propagate but will, in effect, redistribute the stresses in the concrete and reduce the peak stress concentrations to a lower value.

Malier - Le decoupage thermique des betons et precontraintsAnn. de l'Inst. Techn. du Bat. et des Tr. Publ. nr. 353, Sept. 1977 pp. 94 - III I. 34 P. C. KREIJGER 11. C. Cubaud etal. - Procedes de destruction des ouvrages en beton arme - Materiaux et Constructions vol 10 - nr. 57 pp. 127 - 138. 12. UTI-CISCO Seminaire La Fragmentation - Dec. -Remy-Les-Chevreuse (Proceedings still in the press) 13. P. Meric - Influence of grinding and storage conditions of clinker - 7th International Congres on the Chemistry of Cement, Paris 1980, Vol I, pp.

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Adhesion Problems in the Recycling of Concrete by Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)

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