Question

Concrete curing is “the process of maintaining adequate moisture in concrete within a proper temperature range in order to aid cement hydration”. To achieve this heat transfer a large quantity of water is sprayed on the surface so that the outer surface quickly comes to a constant temperature. Consider a very large, thick concrete slab initially at 500 K that is sprayed with water maintaining the upper surface at 300 K. How long will it take for the location 15 cm below the surface to cool to 380 K? After 16 hours, what is the temperature in a location of 17 cm below the surface?

Answer 1