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One of the major uses of concrete modified with styrene-butadiene latex is for bonded overlays on bridge and parking garage decks. The application has been in use for over 20 years, demonstrating the viability and long-term performance of this material. The addition of this latex to portland cement concrete improves both the plastic and hardened properties of the concrete, making it well suited for this application. The typical mix design parameters are: cement content of 390 kg/m3; 0.15 polymer solids cement ratio; and maximum water — cement ratio of 0.40. Construction procedures have developed over the years and are now established by many state highway departments. Problems that can occur with selection of materials and during construction have been identified, as well as measures to take to avoid them. Overlays with this material have been in service for over 20 years.
latex, polymer-modifier, overlays, polymer-modified, bridge decks, parking garage decks
Development Associate, Dow Chemical Co., Midland, MI