By Pieter C. Kreijger (auth.), Pieter C. Kreijger (eds.)
The development explosion throughout the years 1945-1960 will necessarily bring about elevated demolition within the subsequent a long time because the lifetime distribution of buildings not fulfills its practical social necessities in a suitable method. within the construction interval pointed out there has been an exceptional bring up in bolstered and prestressed concrete building. as a result there's now increasingly more concrete to be demolished. more and more serious calls for may be made upon demolition expertise, together with the call for for human- and environment-friendly options. however, the potential for getting rid of particles via dumping is progressively diminishing, specially just about significant towns and usually in nations with a excessive inhabitants density. whilst in such international locations and in such city parts a scarcity of aggregates for making concrete will advance because of regulations on combination operating as a result of its impact at the surroundings and thanks to the unavailability of mixture deposits as a result of city improvement. From the foregoing it follows that recycling and re-use of atmosphere- and human-friendly demolished and fragmented development rubble may be thought of. the interpretation of this common challenge into phrases of fabrics technology is feasible via forming transparent rules of adhesion and unity: the full strategy 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 analogous nature or a distinct nature.
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Additional resources for Adhesion Problems in the Recycling of Concrete
SUMMARY Some of the factors that affect the strength, elastic modulus and deformational stability of concrete are discussed and examples are given of their effects. The importance of the cement paste matrix is emphasised as the mechanical characteristics of concrete are controlled largely by this constituent. 1. INTRODUCTION Concrete consists of natural or synthetic aggregates bound together with an hydraulic cement. The properties of the concrete depend upon many factors that include the strength and porosity of the cement-paste matrix and the properties and grading of the aggregate.
Regarding the quality of concrete made of recycled fine and coarse aggregates there seems to be a more or less general agreement that compression strength, tensile strength and modulus of elasticity are decreased by about 30 - 40% while shrinkage is increased with some'" 30 to 60 % [eg 20]. If only recycled coarse aggregate is used in combination with natural fine aggregates like sand, then the reduction in properties mentioned would be about 15%, 20% and 25% respectively [eg 20]. About the cause of these reductions not much is known.
The problem then becomes one of adhesion - adhesion being defined as a surface property while cohesion is a bulk property. Not only the mean value but the range of materials properties must be known if the forces of rupture and the bonding forces in a given circumstance are to be given proper statistical significance. For this reason it is always necessary to consider the concrete at all levels of structure and size. Chemical structure which is relevant to strength, elasticity, creep, thermal expansion; Physical micro-structure which is relevant to absorption of liquids, gases, permeability, dimensional stability, thermal conductivity, visco-elastic properties, strength, elasticity; Macro-structure which is relevant to strength, dimensional stability, thermal conductivity, thermal stresses, acoustic properties.