MITIGATION OF DEICER DAMAGE IN CONCRETE PAVEMENTS CAUSED BY CALCIUM OXYCHLORIDE FORMATION – USE OF GROUND LIGHTWEIGHT AGGREGATES

Author: Prannoy Suraneni, Naomi Salgado, Hunter Carolan, Chang Li, Vahid Jafari Azad, O. Burkan Isgor, Jason H. Ideker and Jason Weiss
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference Segment on Frost Action in Concrete
Editor(s): Marianne Tange Hasholt, Katja Fridh and R. Doug Hooton
ISBN:978-2-35158-182-7
e-ISBN:978-2-35158-183-4
Publisher:RILEM Publications SARL
Publication year:2016
Pages:182-191
Total Pages:10
Language:English

Abstract: Deicing salts have long been used to improve the safety of pavement surfaces by melting ice and snow. These salts are typically chloride̻ based and therefore may contribute to the corrosion of the reinforcing steel in concrete infrastructure elements. Much less known however is their tendency to react chemically with calcium hydroxide in concrete leading to the formation of calcium oxychloride salt that can cause premature deterioration, especially at pavement joints. It is only recently that the magnitude of this problem has been realized. Mitigation strategies are important, as post̻ damage repair tends to be expensive, disruptive to the travelling public, and puts construction crews in harms way. Prior work has shown that supplementary cementitious materials (SCMs) help mitigate the potential extent of expansive salt formation. Unfortunately, however, SCMs can often be in short supply locally. This paper expands on the previous work by evaluating the use of ground lightweight aggregates (GLWAs) to mitigate calcium oxychloride formation. The effect of sample age on calcium oxychloride formation is studied for neat cement pastes and cement pastes with SCMs and GLWAs. Fitted equations are developed which can be used to estimate the potential for expansive salt formation knowing the mixture design and sample age.

Online publication:2016
Publication type:full_text
Public price (Euros):0.00