Accession Number : ADA263484


Title :   Set Time Control Studies of Polymer Concrete


Corporate Author : NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD


Personal Author(s) : Mathey, Robert G ; Pommersheim, James M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263484.pdf


Report Date : Sep 1989


Pagination or Media Count : 192


Abstract : 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.


Descriptors :   *POLYMERS , *CONCRETE , *CURING , *POLYURETHANE RESINS , HEAT TRANSFER , FAILURE(MECHANICS) , AGGREGATES(MATERIALS) , FLEXURAL STRENGTH , TEMPERATURE , AGING(MATERIALS)


Subject Categories : Ceramics, Refractories and Glass
      Plastics


Distribution Statement : APPROVED FOR PUBLIC RELEASE