By Ravindra K. Dhir, John G. L. Munday
Advances in Concrete Slab know-how files the complaints of the overseas convention on Concrete Slabs held at Dundee collage on April 3-6, 1979. This publication discusses the effect of metal fiber-reinforcement at the shear energy of slab-column connections; sulfur-treated concrete slabs; yield line research of orthotropicaly bolstered external panels of flat slab flooring; and behaviour of flat slab/edge column joints. The layout of a number of panel flat slab buildings; structural habit of ground slabs in shear wall structures; shrinkage and cracking of concrete at early a while; and slab development for HAB approach modules also are elaborated. this article likewise covers the direct completing of concrete slabs utilizing the early age energy grinding strategy; software of vacuum dewatering to in-situ slab construction; retexturing of concrete slabs; and fatigue resistance of composite precast and in situ concrete flooring. This booklet is an efficient reference for college students and members keen on the practices and examine in relation to slab know-how.
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Extra resources for Advances in Concrete Slab Technology. Proceedings of the International Conference on Concrete Slabs Held at Dundee University, 3–6 April 1979
Tunnel linings and rock stabilisation. Speed of application through guniting process. In one tunnelling application increases of the order of six times were reported when guniting replaced traditional timber lagging and hard pack techniques. Thinner steel fibre sections following more closely the rock profile reduce material waste. Predictable, non-catastrophic mode of failure offering important safety advantages. Improved strata control through early sealing of exposed rock. Competitive costs demonstrated in numerous applications.
3 Steel fibre reinforced concrete at 75 kg/m versus mesh at list less 20 per cent: Reduction of 41 per cent necessary. The costs of steel fibre reinforced concretes have been calculated without regard to their performance in service. Where a hard, wear resistant surface is needed, particularly in industrial locations such as steelworks, very expensive alternatives to steel fibre concrete have in the past been used with moderate success. Comparative studies by engineers have proved conclusively that although the initial cost might seem much higher, the very much better long term performance compared to the alternatives has resulted in a cost-performance position which shows that steel fibre reinforced concrete is more economic.
Proc. First Int. Cong, on Lightweight Concrete, l_, 23-37, London (1968). A. Muriin and C. Wilson. J. Am. Concr. , 49 (9), 21-45 (1952). W. M. C. Turna. J. Am Concr. N. B. Ibrahim. Proc. Inst. Civ. , 56, 635-646 (1973). N. B. L. Anand. Mater. , 8_, 413-423 (1975). EFFECT OF REPEATED DOSAGES OF SUPERPLASTICIZERS ON WORKABILITY, STRENGTH AND DURABILITY OF CONCRETE V. M. Malhotra Head, Construction Materials Section, Canada Centre for Mineral and Energy Technology, Canada ABSTRACT This paper gives results of a laboratory investigation to determine the effect of repeated dosages of superplasticizers on workability, strength and durability of concrete.