The purpose of this paper is to quantitatively evaluate concrete temperatures during transport and pumping by a truck agitator in a hot environment. In Part 1, a concentrated heat capacity model was developed for the rotating drum of a truck agitator, taking into account solar radiation and hydration heat generation. The analytical results of concrete temperature by the proposed model agreed with the measured results. It was also clarified that the effect of solar radiation was small and the effect of hydration heat generation was large on the increase of concrete temperature during transportation.
