Title:
Shear Friction in High-Strength Concrete
Author(s):
J. Walraven and J. Stroband
Publication:
Symposium Paper
Volume:
149
Issue:
Appears on pages(s):
311-330
Keywords:
aggregate interlock; cracking (fracturing); friction; high-strength concretes; shear properties; tension; Materials Research
DOI:
10.14359/4089
Date:
10/1/1994
Abstract:
The shear friction analogy is a valuable and simple tool that can be used to estimate the maximum shear force transmitted across a cracked plane in a concrete member. The expressions to determine the shear friction capacity up to now have been based on experiments on concretes with cylinder strengths of at most f' c = 60 N/mm 2. In such concretes, the aggregate particles normally do not break at the formation of cracks through the concrete. In high-strength concrete, however, the cement matrix is strong enough to cause fracture of the aggregate particles. As a result, the crack faces are relatively smooth, so that the shear friction capacity is expected to be reduced. In this paper, shear friction tests are described on concrete with a cylinder strength of f' c = 100 N/mm 2. The experiments are carried out on cracks in plain concrete and on reinforced cracks. It is shown that the reduction in shear friction capacity due to aggregate fracture is considerable.