Experimental Analysis and Micromechanics-Based Prediction of the Elastic and Creep Properties of Polymer-Modified Concrete at Early Ages
Polymer-modified concrete (PCC) has been used since the 1980s mainly for repair and restoration. Nowadays, it is also increasingly applied in construction. The desirable future integration of PCC into guidelines and standards requires a reliable mathematical description of the mechanical behavior of PCC. Notably, PCC exhibits less elastic stiffness and a more pronounced creep activity compared to conventional concrete. This contribution presents a combined experimental-computational study concerning early-age mechanical properties of PCC. Experimental characterization comprised 3 min-long creep tests which were performed every hour, spanning material ages from 1 day after production up to 8 days. This allowed for a quasi-continuous quantification of the early-age evolutions of the elastic stiffness and of the non-aging creep properties. As for computational modeling, an existing multiscale model for the elastic stiffness of concrete is extended toward the consideration of polymers. It is shown that the extended model can reliably describe the elastic stiffness of PCC, provided that entrapped air is adequately considered.
This research is supported by the German Research Foundation (DFG) via the Research Training Group 1462, which is gratefully acknowledged. This work was further supported by a short-term scientific mission (STSM) grant from COST Action TU1404 “Towards the Next Generation of Standards for Service Life of Cement-based Materials and Structures,” which is gratefully acknowledged.
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