By Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)
The development explosion throughout the years 1945-1960 will unavoidably bring about elevated demolition within the subsequent many years because the lifetime distribution of buildings now not fulfills its useful social necessities in an appropriate manner. within the development interval pointed out there has been a good elevate in strengthened and prestressed concrete building. hence there's now progressively more concrete to be demolished. more and more critical calls for might be made upon demolition know-how, together with the call for for human- and environment-friendly concepts. nonetheless, the potential of eliminating particles via dumping is gradually diminishing, in particular just about significant towns and usually in nations with a excessive inhabitants density. whilst in such nations and in such city parts a scarcity of aggregates for making concrete will enhance due to regulations on mixture operating as a result of its influence at the surroundings and due to the unavailability of mixture deposits because 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 basic challenge into phrases of fabrics technological know-how is feasible by means of forming transparent principles of adhesion and unity: the full means 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 assorted debris of both an identical nature or a special nature.
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Extra info for Adhesion Problems in the Recycling of Concrete
G. pfa + opc) are used since the properties of the concrete also depend upon the constituents and there is some evidence (Bamforth 1980) that the tensile strain that a Portland/pfa concrete can carry without cracks forming is lower than that of an equivalent OPC concrete. 1 Drying shrinkage The moisture history is also of considerable importance. If fresh concrete is permitted to dry before the cement has properly hydrated not only will the strength be impaired and cracking may 55 c. D. POMEROY 56 be caused but the concrete will be highly porous and have poor durability.
5r-----------------------------~------_. 0 Fibre content (% by Il0l) Fig. 5 C. D. POMEROY Strength and Stiffness - Discussion An attempt has been made to discuss some of the factors that affect the mechanical behaviour of concretes under load. At the beginning mention was made of the many ways the properties of concrete can be varied. Not only is the choice of cements, aggregates and admixtures wide, but the proportions of each component and the grading of the aggregate all affect the ultimate product, either directly or in the way they affect the water needed for the fresh concrete to be usable.
POMEROY the falling part of the complete stress/strain curve for concrete in compression (Figure 6). The ductile failure applies to concretes of moderate strength made with dense aggregates. High strength concretes have a much more rapid drop in load carrying capability after the peak stress has been reached. Wittmann (1980) has summarized work on fracture on a microscale and discusses the conditions for crack propagation to take place, both through and around aggregate particles. At this point it must be emphasised that only plain concrete, subjected to simpie compressive loading has been considered and that the deformation and failure of concretes subjected to more complicated loading can show different characteristics.