Closure to 'Tensile Creep Behavior of Concrete Subject to Constant Restraint at Very Early Ages' by Ya Wei and Will Hansen

摘要

The authors would like to thank the discussers for their interesting suggestions. The points they raised are important and allow the authors to clarify some of the ideas in the original paper. The discussers recommended obtaining q_1 to q_3 values through curve fitting based on the experimental results instead of determining q_1 to q_3 according to Bazant's equations (Bazant and Baweja 2000), which were adopted in the original paper for q_1 to q_4 calculations. The discussers also provided their q_1 to q_4 values obtained through curve fitting to their experimental measurements. However, the authors need to clarify that (1) the Bazant's methods of determining q_1 to q_4 are based on the composition and strength of concretes as well, and the equations were developed based on data mining of many creep tests conducted around the world, therefore they are considered representative and solid to be used in calculating q_1 to q_4 for creep prediction; and (2) obtaining q_1 to q_4 by curve fitting to the experimental results might result in getting nonunique values of q_1 to q_4. The original paper intended to provide a general methodology for modeling early-age tensile creep under the restrained condition based on an existing solid model (B3 model) instead of just giving specific values obtained simply through curve fitting to the experimental measurements. Moreover, from the authors' restrained test, the tensile creep prediction using B3 model deviates from the measurements at later ages, which are closely related to q_4 instead of q_1, q_2, and q_3, therefore, modifying q_4 is the most efficient and reasonable way.