Abstract
This paper presents the results of laboratory investigations
regarding the effects of granular urea on heat liberation from selfcompacting concrete incorporating as-received rice husk ash. The
temperature of concrete was measured under semi-adiabatic conditions.
In a self-compacting concrete mixture with a water-to-cementitious
materials ratio of 0.30, Type 1 Portland cement with a constant
cementitious content of 550 kg/m
3
was replaced with as-received rice
husk ash at 20 wt%. A superplasticizer was used to maintain a slump
flow diameter of 70 ± 2.5 cm. Adding urea to self-compacting concrete
reduced the maximum temperature rise in a urea concentrationdependent manner, and slowed the rate of the temperature rise of
concrete.
Keywords: Heat liberation, Granular urea type, Self-compacting
concrete, Rice husk ash.