|
To conform usability of water-quenched BF slag substitution
offshore sand,the effect on concrete by water-quenched BF slag,
which produced by China Steel Corp.,in different percentage of
substitute was inve-stigate. Under the conditions of 3 different
fineness modulous of offshore sand,5 different slag
substitutes,1 slump and 4 different water-cement ratios,
properties such as workability,compressive strength,tensile
strength,durability,diffusibility,elapsing time,agg-regation,
etc., of concrete composed of different substitutes of water-
quenched BF slag were compared.The particles of water-quenched
BF slag are mostly in globular shape and with good flowability.
The workability then can be enhanced and the consumption of
water can be reduced as the ratio of substitution increased.
However,the bleeding and segregation also become more prominent
when the ratio of substitution increased due to its high
specific gravity. Therefore,the best ratio of substitution is
around 40% to 55%. The substitution may be reasonably reduced if
the fineness modulous of offshore sand can be enhanced.The
results of this study showed that the compressive strength of
all concrete composed of water-quenched BF slag in different
substitution were better than that of concrete composed of
offshore sand. The change of tensile strength and water
tightness are similar to that of compressive strength.As the
substitution increased,the durability was enhanc-ed,the
shrinkage lessened,and the time of aggregation delayed.
|