EFFECT OF HIGH CURING TEMPERATURE ON MECHANICAL PROPERTIES OF CONCRETE

Year 2017, , 19 - 23, 30.06.2017

Olanrewaju D.o. A.Y Akinsanya O.A Olowu

https://doi.org/10.17261/Pressacademia.2017.565

Abstract

It has been shown that Concrete increases in strength with age after
setting. The strength at a particular age can be further increased by suitable
curing of the concrete while it is maturing. Such curing comprises the
application of heat and/or the preservation of moisture within the concrete. In
this research work, an attempt has been made to study the influence of elevated
curing temperature on mechanical properties of concrete. Mechanical properties
such as comprehensive strength and pullout strength were investigated. Concrete
Specimens were cured under three different temperatures and curing age 30⁰C,
60⁰C and 100⁰C and 7, 14 and 28 days respectively.
Compression test and pull out test were conducted on concrete cubes. The
results showed strong positive relationship with correlation coefficient 0.779 between number of days and strength of concrete and the P–value 0.004
implies that the relationship is significant at 5% level while the coefficient
of Determination (COD) indicates that number of days have 60.75% effect on
strength of concrete. Correlation coefficient 0.932 with a P-value 0.013 and
COD of 86.79% indicate that temperature has a very strong effect on strength of
concrete. The regression analysis showed a unit increase in temperature will lead
to 0.062 N/mm² increase in the strength of concrete. However the
rate of concrete strength at the increase in temperature is lower than the
increase in number of days, this implies a tendency for concrete to be weak in
future with increase in temperature especially above boiling point. 

Keywords

Concrete, curing, compressive strength, pullout strength, elevated temperature

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