A NEW PENETRATION APPARATUS FOR LOW SLUMP CONCRETE
Abstract
Workability is an important property of concrete and
its measurement in the field for low slump concrete is a
problem. Hence, a new
penetration apparatus was devised by
K. W. Nasser to measure workability. This apparatus,
which is convenient and simple to operate was used in this
investigation.
Tests were
performed on 7 mixes: three were plain and
the other four were fibre reinforced concrete. The fibre
content was either 1.5, 2.0, 2.5 or 3.0 pounds per 1.31
cubic yard (CY) (681, 908, 1135 or 1362 grams/cubic meter)
of concrete. The results of the test were compared to those
of the Vebe and the Inverted slump-cone tests and they
showed that workability increased with an increase in water
content or W/C ratio once maximum cohesion between the
materials was overcome. In the fibre reinforced concrete
the results correlated well with the other two tests: the
Vebe and the Inverted slump-cone and they all showed that
workability decreased with an increase in the fibre content
of the mix.