By Dr J L Clarke
Light-weight mixture concrete is present process whatever of a renaissance. even if this fabric has been on hand for a few years, in basic terms now's it getting used extra largely. the amount of structural combination concrete used every year is expanding dramatically. reduce structural weight, greater fireplace resistence, use of waste for combination, reduce expenditures for mixture: these kind of components are contributing to the speedy raise within the use of attractiveness of structural light-weight combination concrete. This e-book offers a entire overview of this transforming into box from a global point of view.
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Extra info for Structural Lightweight Aggregate Concrete
9 Stress-strain curves (ref. 79). between the lightweight aggregate particles and the surrounding cementitious matrix. In the case of normal weight concrete the formation and propagation of small microscopic cracks, or microcracks (2–5 μ m), have long been recognised as the causes of fracture and failure of concrete and the marked non-linearity of the stress-strain curve, particularly near the ultimate stress level. Although some of these discontinuities exist as a result of the compaction process of fresh concrete, the formation of small fissures or microcracks in concrete is due primarily to the strain and stress concentrations resulting from the incompatibility of the stiffnesses of the aggregate and cement paste/mortar components.
0035 for all concretes. Thus in flexure, the stress block is closer to triangular in shape, if these idealised diagrams are used. 8 times the neutral axis depth as for normal weight concrete. For under-reinforced sections these changes have no significant effect on the ultimate moment capacity. However, for over-reinforced sections the moment capacity, for a given grade of concrete, will be slightly reduced. The Norwegian code  also uses a bilinear stress-strain diagram for lightweight aggregate concrete, but only for grades between 15 and 45 N/mm2.
Norwegian contractors, personal communication. , Impact of falling loads on submerged structures, Proc of Int. Symp. on Offshore Structures , Rio de Janeiro, Brazil, October 1979, pp. 1215–32. J. 2, Nordic Concrete Federation, Oslo, December 1983, pp. 102–13. , Mayfield, B. , Impact testing of fibre-reinforced stair treads, Magazine of Concrete Research, 27 (No. 92; September 1975). , Concrete under complex states of stress, Chapter 5, Developments in Concrete Technology—1 (ed. ), Applied Science Publishers, 1979.
Structural Lightweight Aggregate Concrete by Dr J L Clarke