01697328

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The interaction of deicing chemicals and freeze-thaw cycles produces serious scaling damage of airport concrete pavement. The indoor test of salt frost resistance of concrete is still open to the question, and the indirect evaluation method has inherent disadvantages. In this study, the damage process of different surfaces of concrete pavements when immersed into deicing salt solution was compared and analyzed, and Roughness growth ratio (RGR) was proposed to quantify the degree of pockmark caused by salt freeze damage, and industrial computer tomography (CT) technology was used to scan the hardened cement concrete specimens to obtain the air void structure distribution information, the void-to-void distance as a factor was proposed to evaluate the salt frost resistance of the cement concrete, and compared with the Power’s spacing factor of the existing specification. The results revealed that the molded surface showed the worst resistance to salt frost action, followed by the molded side and the sawed side was the best. It was found that there was a good correspondence between the air content of concrete test surface and the mass loss during freeze-thaw (F-T) cycles. Powers’ spacing factor was found to underestimate the resistance potential to frost damage when compared to the void-to-void distance factor d ¯, which had a good correlation with scaling mass at 28 F-T cycles. Thus the salt frost resistance of concrete could introduce the void-to-void distance factor d ¯ of hardened concrete for characterization.

This paper was sponsored by TRB committee AFN20 Standing Committee on Properties of Concrete.

19-05451

English

6p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; References

Air voids; Airport runways; Concrete pavements; Freeze thaw durability; Roughness; Salts; Scaling (Concrete); Surface course (Pavements)

Aviation; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-05451

TRIS, TRB, ATRI

Dec 7 2018 9:24AM