Design and Properties of Concretes with Strength Over 1500 kgf /cm2


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Title: Design and Properties of Concretes with Strength Over 1500 kgf /cm2

Author(s): G. Tognon, P. Ursella, and G. Coppetti

Publication: Journal Proceedings

Volume: 77

Issue: 3

Appears on pages(s): 171-178

Keywords: atmospheric pressure steam curing; autoclaving; beams (supports); binders (material); compressive strength; concrete piles; ductility; flexural strength; high strength concretes; mix proportioning; moment-curvature relationship; portland cements; quartz

Date: 5/1/1980

Very high strength concretes (VHSC) having a compressive strength over 1500 kgf/cm2 (21,500 psi) were made. This result was reached by using high strength portland cement, ground quarfz, and siliceous aggregates, and by subjecting the concretes to a two-stage low and high pressure steam curing. The VHSC have a high modulus of elasticity, a IOW Poisson’s ratio, and an almost linear stress-strain curve up to the maximum load. Reinforced concrefe beams (0.10 x 0.20 x 2.00 m) having different reinforcement ratios from (0.87 to 8.88 percent) were manufactured using VHSC and an ordinary concrete as a reference. These beams were tested in flexure by observing the trends of the curvature as a function of the applied moment. By using VHSC in the reinforced beams, a considerable increase in the flexural rigidities and in the ultimate resisting moments was noted; the high modulus of elasticity and the high mechanical strength have no unfavorable effects on ductility. The VHSC were used in an industrial test: centrifuged piles 12 high and 0.50m in diameter were manufactured. These piles were compared with the normal concrete piles.