Rapid Assessment of Air Void System in Fresh Concrete

Proposal title: Rapid Assessment of Air Void in System in Fresh Concrete Air void parameters such as specific surface (SS) and spacing factor (SF) are essential in evaluating Freeze-Thaw (F-T) durability in fresh concrete. We have demonstrated the feasibility and viability of using an acoustic method to measure in near real time air void distributions in fresh concrete, the proposed solution is based on the fact that air bubbles are very sensitive to acoustic excitation. By further enhancing the robustness and accuracy of the acoustic method, improving the portability of the design, and conducting extensive field validation and improving the design based on feedbacks, we will have a field ready prototype system for air void measurement through this project. This robust and compact instrument will provide rapid and accurate assessment of air void parameters of fresh concrete wherever the information is needed.