- Author
- Mathey, R. G. | Pommersheim, J. M.
- Title
- Set Time Control Studies of Polymer Concrete.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD Bucknell Univ., Lewisburg, PA
- Sponsor
- Air Force Engineering and Services Center, Tyndall AFB, FL
- Report
- NISTIR 89-4026, September 1989, 195 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- concretes; polymers; setting time; polyurethane resins; temperature; catalysts; water; pilot plants; flexural strength; mathematical models
- Abstract
- Set time data were obtained for polymer concrete made with a proprietary polyurethane resin for a wide range of aggregate and resin temperatures. Catalyst concentrations were adjusted so that setting occurred within a required time range. The effects of the presence of water and ice on set time were also studied. Set time data were also obtained from pilot tests using another polyurethane and catalyst for various aggregate and resin temperatures and moisture conditions. Considerably more catalyst was required in the pilot tests to obtain comparable set times. The impact of temperature variations on flexural strength was investigated. The flexural strength and failure mechanism at early ages depended on the temperature of aggregate and resin at the time of casting the polymer concrete. Using the model, a series of design charts were prepared which can be used to predict set time when catalyst concentration and initial aggregate and resin temperatures are given, or to determine the catalyst concentration needed to assure set time corresponding to specified aggregate and resin temperatures.