Testing Air Content of Dry-Mix Shotcrete It has been well-established that the freezingand-thawing resistance of concrete is im- proved by air entrainment. By shotcreteweb|2022-02-16T16:54:19+00:00January 3rd, 2015| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail About the Author: shotcreteweb