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Air Entrained Concrete
In September 2003, Calgary Transit constructed an 92,666 ft2 (8,609 m2) addition to their bus barn facility involving 1,290 cubic meters of both air and non-air entrained abrasion resistant concrete. Abrasion resistant concrete was specified to withstand heavy wear of bus traffic. The bus barn entrance aprons specified 4% to 7% air entrainment for the CSA Class C2 exposure conditions with the remainder of the interior concrete being non-air entrained (Class N). The slab thickness was 6” (150mm).
The project manager Devitt & Forand, and the concrete supplier Inland Concrete, recommended HARD-CEM, an integral concrete hardener to provide a superior abrasion resistant concrete floor. HARD-CEM was simply added at the Inland Concrete batch plant mixer from a silo at a rate of 40kg/m3 and supplied over three days of pumped concrete placement. The finishers appreciated the quality controlled mix which was “creamier” and easier to work and finish. HARD-CEM was ideal for this application requiring both freeze-thaw durability and superior abrasion resistance.
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