Impact of Chemical Deicers-Overview of Problems with Deicer Scaling Test Methods (Recorded presentation)

Overview of Problems with Deicer Scaling Test Methods (Recorded presentation)

Video Transcription

Video Summary

The presentation discusses the inadequacies of the ASTM 672 de-icer scaling test for concrete, which has been standard since 2012. The speaker addresses issues with test method effectiveness, especially in relation to de-icers and adverse shadowing in concrete caused by de-icer salt scaling. The test is criticized as being qualitative and variable, leading to inconsistent results when different labs conduct the same test. The speaker argues that this test unfairly disadvantages slag and fly ash mixes due to inadequate curing processes and does not correspond well with field performance. Studies conducted in Canada and the U.S. show better real-world performance of these materials. A new Canadian standard has been adopted, which includes improvements such as salt ponding before freezing, insulating slab sides, and more realistic curing methods. The speaker proposes these improvements could replace the current method in upcoming ASTM discussions.

Keywords

ASTM 672

de-icer scaling

concrete testing

slag and fly ash

Canadian standard

test method improvements