By Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)
The construction explosion through the years 1945-1960 will unavoidably bring about elevated demolition within the subsequent many years because the lifetime distribution of constructions now not fulfills its practical social specifications in a suitable approach. within the construction interval pointed out there has been a very good raise in bolstered and prestressed concrete development. therefore there's now a growing number of concrete to be demolished. more and more serious calls for might be made upon demolition know-how, together with the call for for human- and environment-friendly concepts. nonetheless, the opportunity of casting off particles by way of dumping is gradually diminishing, particularly with reference to significant towns and customarily in international locations with a excessive inhabitants density. even as in such nations and in such city parts a scarcity of aggregates for making concrete will enhance because of regulations on combination operating due to its impact 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 might be thought of. the interpretation of this common challenge into phrases of fabrics technology is feasible via forming transparent principles of adhesion and unity: the full strategy of demolition, fragmentation, and recycling or re-use of concrete is to wreck 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 special nature.
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Extra resources for Adhesion Problems in the Recycling of Concrete
3, 1979, pp. 175 - 190. 8. G. Huyge - Demontabel bouwen (demountable building) - Lezing Studiedag "Slopen, demonteren en kringloopgebruik van beton" (Lecture on Study-day "Demolition, demountable construction and recycling of concrete") - Technologisch Instituut KVIV, Antwerpen, 29 Nov. 1979. 9. P. Lindsell - Demolition of post-tensioned concrete - Concrete Jan. 1975, pp 22 - 25. 10. Y. Malier - Le decoupage thermique des betons et precontraintsAnn. de l'Inst. Techn. du Bat. et des Tr. Publ. nr.
Stirrups and secondary reinforcement can constrain the lateral expansion that occurs when concrete is compressed and help to enhance its apparent ductility. Fibres (asbestos, steel, polymer and glass) are used to reinforce concrete, and more importantly, cement paste or mortar to facilitate the manufacture of thin sheets that can be corrugated for roofing or folded into complicated shapes for many different purposes. 4 Admixture Chemicals are added to a concrete mix for a variety of reasons, the more important being a) to reduce the water required for a specified workability 42 C.
In practice other factors affect its performance. These include the placing and compaction of the concrete into the structure, the curing and "early age temperature history of the concrete, the subsequent loading and environmental history of the concrete and the long-term stability of the constituents. These topics will be discussed briefly in the remaining part of this paper. 0 The influence of the environment upon concrete behaviour It is easy to believe that experience gained with concretes in one part of the world automatically applies elsewhere, yet in Canada or Norway concrete could be placed at sub-zero temperatures while in the Middle East not only are the ambient temperatures high but the prevailing humidity can be very low.
Adhesion Problems in the Recycling of Concrete by Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)