| The paper reviews the effect of temperature on portland cement concrete and methods
to improve its heat resistance. It is shown that by using aggregates of low thermal
expansion, the plain concrete can be made suitable for high temperatures. For
temperatures above 500° C, addition of fine siliceous materials is recommended to
overcome adverse effects of free lime liberated on hydration of cement.
In RCC, bond with plain mild steel is seriously affected due to rise in temperature
on account of unequal expansion. Use of deformed steel is recommended for
temperatures up to 450°C since there is no loss of bond strength. Beyond this
temperature, steel begins to creep and hence RCC is not suitable. |
