Development of Water Extended Polyester Resins for Limited War Structures.
Final technical rept. 15 Jul 67-20 Mar 68,
ASHLAND CHEMICAL CO MINNEAPOLIS MN
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Unsaturated polyesters extended with high levels of water have been developed. The water-in-oil emulsions resulting from mixing polyester and water have been conventionally cured with peroxide-promoter combinations to composites with unique property combinations. The high water content of the water extended polyester WEP materials gives them excellent logistics which suggest their use in limited war structures. WEP materials were developed to obtain the best possible structural properties, fastest cure, good workability, and best logistics. Developed materials were evaluated in small scale tests and engineering data was collected. Using contemporary design methods and the available engineering data, modular building units, such as blocks, panels, and beams, were molded. An outdoor test structure 11 x 9 x 8 feet was designed and fabricated from the modular structural units. Large dimensional changes caused by thermal expansion, freezethaw expansion, and residual shrinkage in the material caused significant movement within the structure. The dimensional instability not evident in small scale testing caused the breakup of the test structure. While the problems of dimensional change were considered to be soluble, the funds available in the program were judged to be insufficient to attempt a reasonable solution. The program was terminated. Author
- Structural Engineering and Building Technology