Abstract:
This research work or study carried out to consider the effect of different curing methods
on the performance of concrete for grade 25 of normal concrete. The concrete prism and
cubic samples of mix ratio 1:2.08:3.10 produced with a water-cement ratio of 0.53. The
objective of this research was to determine the effect of different curing methods on the
performance of concrete. This study considers the effect of different curing methods on the
strength, carbonation, length change, sorptivity, absorption and the density of concrete.
Five curing methods (air curing, water submerged curing, fogging or spraying curing,
burlap curing and moist sand curing) were used to evaluate the compressive strength of
concrete, carbonation of concrete, shrinkage of concrete, absorption, and sorptivity of
concrete on 3rd days,7thdays,14th days, 28th days, 56th days at hot and medium air
temperature. A total number of 210 cube and 30 prisms samples casted for all curing
methods. The cubes and prisms specimen cured in the laboratory at Hot air temperature
(18-39 0C) or mean air temperature (27-300C) and medium air temperature (11.2-32.70C)
or mean air temperature (20.6-26.60C). The result indicated that water submerged curing
was the highest compressive strength of concrete followed the close burlap curing, spraying
curing and moist sand curing methods and it was the lowest shrinkage, water absorption
and water sorptivity of concrete. The result shown that water submerged, burlap, spraying
and moist sand curing were no carbonation depth indicated in concrete. the air curing
techniques were the lowest compressive strength of concrete and highest length change,
water absorption, and water sorptivity of concrete; and concrete could carbonated in hot
and medium air temperature. The concluded weak positive correlation between the strength
and the density of concrete. The strength strong negative correlation with length change,
water sorptivity and water absorption of concrete at a hot and medium air temperature.
Finally, the water submerged curing and moist sand curing techniques were the
appropriate techniques for off-site construction of concrete structures; and the burlap &
spraying curing techniques were suitable curing techniques for off-site and on-site
construction concrete structure members in hot and medium environmental conditions.
