Abstract: The temperature field and the shrinkage performance of the UHPC-NC functional gradient composite beam was carried out, which was based on the UHPC thickness as the basic content in cement hydration stage. The results show that when the thickness of UHPC more than 20 mm, the difference in temperature between the center section and the outer edge reaches 5 . 6 ℃, and the difference of maximum tensile stress value caused by temperature is 3. 36 MPa, which proves that beam of hydration heat temperature stress produced can not be ignored. On the basis of experimental research, a calculation method considering the effect of the UHPC UHPC-NC functional gradient layer the thickness of the composite beam temperature stress was put forward. The calculation results are good agreement with real measured data.

Key words: hydrate heat;ultra high performance concrete;temperature field;early age;shrinkage;crack