Moisture Content Requirements for Effective Concrete Repairs
What is the optimum moisture content for the concrete substrate for different concrete repair materials to ensure successful long-term performance?
Need and Benefit
Results from research just completed show that the moisture condition of the concrete substrate can have a large impact on the success or failure of a repair.
The success of concrete repairs and overlays is lower than desired and hard to predict. Many times they crack prematurely, reducing the service life of the repair and requiring expensive repairs much sooner than originally planned. Recent surveys of operation and maintenance water management training participants showed that about 30 percent of the attendees performed some level of work on concrete repairs--most of the repairs were small, and most only lasted about 2 years.
This lab has been working for a number of years in this area, along with partners from other government agencies, universities, material suppliers, and concrete repair specialists. This problem with repairs and overlays is not unique to the Bureau of Reclamation (Reclamation), but is reflected in the repair industry as a whole. The problem is more significant to Reclamation because of the age and quality of much of our older concrete structures, making repairs even more difficult.
Technical report evaluating and recommending what happened and how to utilize the optimal moisture condition for concrete repair.
If successful will lead to an extra chapter to the concrete repair guide. Collaboration with ACI will take place with all results.