Dear reader we will discuss this post according to ASTM C1116/C 1116M. We have published series of posts about fiber reinforced concrete in the last week. Here we will discuss about specification for air-entrainment. This must be made clear to reader that following specifications is applicable when general designed applicable specification is absent.
Air entrainment is required in fiber-reinforced concrete for any mix design purpose or for workability or other reasons like freezing-thawing resistance. When this air-entrainment is required is out of the scope of this post. Here we give limits for providing air-entrainment considering exposure conditions which prevail around desired concrete structure. We are providing a table for specifying air content that recommended by ASTM.
The air content provided in table are optimum for particular size of aggregate and corresponding exposure condition. The air content lower than that, produces a fiber reinforced concrete of less durability properties. The air content greater than that, produces a low strength concrete of having no further contribution to freezing-thawing resistance. In the next post the ordering information that have to provide to purchase fiber reinforced concrete of desired properties