Deicer Salt Scaling Resistance ofRoller-Compacted Concrete Pavements

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Title: Deicer Salt Scaling Resistance ofRoller-Compacted Concrete Pavements

Author(s): J. Marchand, J. Boisvert, M. Pigeon and H. L. Isabelle

Publication: Special Publication

Volume: 126

Issue:

Appears on pages(s): 131-154

Keywords: air entrainment; durability; pavements; roller compacted concrete; deicers; scaling; Materials Research

Date: 8/1/1991

Abstract:
As part of an extensive investigation of the durability of roller-compacted concrete pavements, 28 different concrete loads were cast during the summer of 1988. Four types of cement, two different sands (one natural and one manufactured) and two water-cement ratios (0.27 and 0.35) were used to prepare these mixtures, An air-entraining agent was added to half of them. One-third of the test section was moist cured for 7 days, a white curing compound was sprayed on another third and the remaining portion received no special treatment. Samples representative of all mixtures and all curing conditions were taken from the pavement after 28 days. The air-void characteristics of all concretes were determined in accordance with ASTM C 457 and the salt scaling resistance of selected combinations (of the type of mixture and the type of curing) was evaluated using ASTM C 672 on both rolled and sawn surfaces. Results indicate that it is extremely difficult to entrain air in this type of concrete even if fairly large dosages of air-entraining agent are used and mixing time is increased. Despite the lack of spherical air bubbles, good scaling resistances were obtained with the silica fume and the fly ash concretes prepared with the natural sand and cured with a membrane.