How temperature plays an important role on concrete
The concrete is extended with the rise in temperature and contracted with reduction in temperature. The range in difference in temperature differs from areas to areas, seasons to seasons and day to day.
The crack may happen in concrete because of contraction integrated with the impact of shrinkage.
Sometimes, big and injurious stress may produce owing to deformation that takes place for temperature variation.
The coefficient of thermal expansion of contraction is dependent on the type and quantity of cement, aggregate, proportionate humidity and sizes of section.
In high temperature, the concrete is influenced by the following factors :-
1. The elimination of evaporable water
2. The elimination of combined water
3. Modification in cement paste
4. Disruption (of beam) from discrepancy of expansion and resultant thermal stresses
5. Modification of aggregate
6. Alteration of bond among aggregate and paste
Cycles of temperature can provide a gradual impact on the curtailment of strength and even long-lasting curing can?t improve the loss.
Tensile strength of concrete is mostly affected with temperature.
If the heating is adequately fast, high stresses can be added and therefore, failure and instability may occur.