Title: Use of Entrained Air Concrete Exposed to Chlorides in Non-Freeze Thaw Environments: Effects on Plastic Concrete Properties
Abstract: The Canadian Standards Association (CSA) A23.1-04 requires air entrainment in concrete subjected to chlorides, not only for freeze-thaw environments but also for non freeze-thaw environments. Depending on the timing and amount of toweling, air entrained slabs can be susceptible to surface delamination. As a result, air entrainment can not only add cost, it can make it more difficult to achieve a durable structure. This paper presents results from testing 12 different plastic concrete mixes (with and without entrained air) placed on active construction sites for conformance with CSA A23.1-04. Air content and slump were tested at the time of placement and compressive strength at 28 days. Rapid chloride penetrability tests were completed after 56 days and a linear air traverse test was performed on the cured specimens. Test results showed that non-air entrained mixes can meet the workability and durability requirements of a Class C-1 mix as defined by CSA A23.1-04.
Publication Year: 2010
Publication Date: 2010-07-05
Language: en
Type: article
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