STRENGTH OF CONCRETE COLUMN CONFINED BY PLASTIC (PVC) PIPE

Authors

  • A. J. AKPAN Transport School, Nigerian Institute ot Transport Technology, Zaria. Author
  • S. S. LETCHA Civil Engineering Department, Ahmadu Bello University, Zaria. Author
  • M. FAROUK Sokoto Urban Development Authority, Sokoto, Nigeria. Author

Abstract

This experimental investigation was carried out to determine the strength of concrete column confined by plastic pipe and the effect of slenderness ratio on the strength.

Pipes of 75.0mm and 100.0mm diameters and of varied lengths were used. Two different concrete mixes were tested. The first had a 1.5 sand cement ratio and 3.0 coarse aggregate cement ratio, while the second a 1.0 sand-cement ratio and 7.0 course aggregate. cement ratio was used.

The samples were made into three groups and one of these groups was reinforced with 6.0mm diameter bars. All tests were carried out in uniaxial compression under monotonic loading.

The results showed appreciable increase in concrete strength when confined by plastic pipe. Increase in strength of about two times the strength of unconfined concrete was recorded. The reinforcement bars were of no significance in terms of strength Increase particularly in the case of short columns. The ultimate strength of the confined columns decreased with increasing slenderness ratio.

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Published

2000-09-29

Issue

Vol. 35 No. 3 (2000): NSE TECHNICAL TRANSACTION JOURNAL (NSE TT-J)

Section

Articles