Title:
Effect of Fiber Addition on the Autogenous Shrinkage of Silica Fume
Author(s):
A. M. Paillere, M. Buil, and J. J. Serrano
Publication:
Materials Journal
Volume:
86
Issue:
2
Appears on pages(s):
139-144
Keywords:
cracking (fracturing); fiber-reinforced concretes; metal fibers; high-strength concretes; self-desiccation; shrinkage; silica fume; stress-strain relationships; Materials Research
DOI:
10.14359/2295
Date:
3/1/1989
Abstract:
It has been found experimentally that very high strength silica fume concretes undergo early cracking when deformation is restrained. This phenomenon, which occurs even when the concrete is protected against any evaporation, is attributed to an intense autogenous shrinkage of the concrete because of its exceptionally low w/c (0.26). An attempt has been made to correct this weakness of the material by adding steel fibers. Two types of hooked fibers (with ratios of length in mm to diameter in hundredths of mm: 30/60 and 50/50) were tested at a content of 0.8 percent by volume. For each type of fiber, the optimum sand-aggregate ratio giving maximum slump was determined, together with the bending, compressive, and tensile strengths of the resulting material. The fiber concretes have an autogenous shrinkage lower than the reference concrete and undergo cracking at a later age under restrained deformation.