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
DOI:
10.14359/12284
Date:
5/1/1980
Abstract:
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.