Set Time Control Studies of Polymer Concrete
NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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Set time data were obtained for polymer concrete made with a proprietary polyurethane resin for a wide range of aggregate and resin temperatures. Catalysts concentrations were adjusted so that setting occurred within a required time range. The effected of 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 and 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. A model for the prediction of set time of polymer concrete was developed based upon thermodynamic and kinetic principles. The model parameters were determined experimentally from auxiliary laboratory tests conducted separately from the set time tests. Reasonable agreement was found between the model and the data from the set time since observed set times and resin temperatures generally agreed with those predicted by model.
- Ceramics, Refractories and Glass