Composite slab floors made of cross laminated timber and ultra high-performance concrete: Early-age deflection, stripping time, and its implication on the structural performances

•The short-term deflection of the CLT-UHPC floor without shoring reached 50 % of the maximum allowed.•UHPC shrinkage causes 75 % of the short-term deflection.•UHPC shrinkage reduced the effective bending stiffness of 35 %.•A discretized solution based the effective modulus has been developed to predict the short-term deflection.•The developed analytical model allows estimating the optimal stripping time.•CLT-UHPC floor of 10 m with a shoring removal time 2 days after casting can be designed.