Long-term permeability measurements on site-cast concrete box culverts

摘要

This study investigated the effect of age on transport property measurements of concrete cover. Changes in moisture contents, air permeability, and water sorptivity were monitored for three years by conducting non-destructive tests on surfaces of site-cast concrete box culverts and mock-up specimens. Furthermore, carbonation rates in the specimens were measured. The results revealed that transport properties measured by non-destructive tests were effective at detecting effects of cement types and curing periods on the carbonation progress. In particular, the air permeability coefficients of specimens with lower moisture contents at later ages showed high correlation with the carbonation rates. (C) 2018 Elsevier Ltd. All rights reserved.