Abstract
Frost resistance of porous concrete (PoC) was examined based on the scaling and water absorption property under freeze-thaw action with JIS A 1148 procedure A/B and RILEM CIF/CDF tests. As a result, water absorption behavior of PoC could be subdivided into two parts: water absorption under isothermal temperature and frost suction during freezing and thawing cycles. Little amount of frost suction made PoC more resistant to frost scaling. Air entraining was effective against frost scaling of PoC, as well as that of conventional concrete. In addition, frost damage of PoC which has a service period of 10 years at cold climate corresponded to that of the replicated PoC. This replicated PoC had been subjected to approximately 40 freezing and thawing cycles with CDF test. In this study it was found that if the scaling quantity of PoC exceeds 300g/m2, the relative dynamic modulus of elasticity and the flexural strength sharply decreases. It was confirmed that the scaling resistance was an important factor to evaluate the frost resistance of PoC.
