In order to verify frost damage resistance of Lightweight concrete type 2 supposed to be poured to roof slab of high buildings at winter season, the authors have investigated by accelerated experiment on 1,000 cycle’s freeze-thaw in atmosphere, and by exposed experiment during 4 years at outside in cold areas. As the result of accelerated experiment, relative dynamic modulus of elasticity was over 100% for the concrete specimen covered on surface, and around 90% for the specimen no covered. And as the result of exposed experiment, it was over 100% for the specimen no covered.
