Abstract
Concrete is generally strong in compression and weak in tension also it resist against fire. Cement concrete is a complex mixture of different materials, for which the properties may alter in different environmental conditions. The behavior of concrete is depends on difference in temperatures and its mix proportions. The principle effects in the concrete due to elevated temperatures are loss in compressive strength, loss in weight or mass, change in color and spalling of concrete. The objective of this research attempt was to prove experimentally the effects on the behavior of concrete under elevated temperatures of different grades (M20, M40 and M60) of concrete. The compressive strength was determined at different temperatures, thus providing scope of determining loss in strength. In addition, effects on strength under cooling for different grades of concrete were studied. The specimens were kept in oven at certain temperatures (200°C, 400°C, 600°C, and 800°C) for 1 hour at constant temperatures. Non-destructive testing (NDT) methods, i.e. Rebound hammer test was adopted to study the changes in surface hardness of concrete specimens subjected to elevated temperatures.
Highlights
Concrete is important material used in any type of construction
To be able to predict the response of structure after exposure to high temperature, it is essential that the mechanical properties of concrete subjected to high temperatures be clearly understood
All specimens were moist cured for 28 days after casting. [2] studied the influence of test conditions, value of w/c and the presence of silica fume on the compressive strength and elastic modulus of high strength concrete exposed to elevated temperatures and concluded that losses in relative strength due to high temperature exposure were affected by the test condition and w/c, but the presence of silica fume does not appear to have a significant effect
Summary
Concrete is important material used in any type of construction. Properties of concrete are changes in case of unexpected fire. Acceptance of concrete as a main construction material by the construction industry contributed to the economical construction of high-rise buildings and long spans bridges all over world due to its high compression resistance and good durability In this modern technology construction of high strength concrete is became possible, which unavoidably leads. The risk of exposing high strength concrete structures to elevated temperatures increases with the increase in usage of high strength concrete by the construction industry. [2] studied the influence of test conditions, value of w/c and the presence of silica fume on the compressive strength and elastic modulus of high strength concrete exposed to elevated temperatures and concluded that losses in relative strength due to high temperature exposure were affected by the test condition and w/c, but the presence of silica fume does not appear to have a significant effect. The mechanical properties including the melting point and ignition point of fibres affect significantly the properties of concrete composites with addition of fibres
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