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High-temperature Cement
2020-11-11 14:06:31

High-temperature cement formulations are basically polymer concrete. Mainly unsaturated polyesters or vinyl ester resins with allylphthalate as vinyl monomer are in use. Curing is achieved with peroxides, which decompose sufficiently fast at temperatures between 120 and 200℃. Polymer concrete requires additional materials, which compensate shrinkage.

Highly filled polymer composites, such as polymer concrete, suffer from setting stresses generated during the cure of the resin binder, when the polymerization shrinkage is hindered by the close packing of a filler and by aggregate particles. The setting stresses significantly decrease the strength of the cured composite. Producing zero-shrinkage with strength enhancement can be achieved by dispersing small amounts of the hydrated mineral montmorillonite into the resin. The addition of montmorillonite was found effective with three different resin binders ( polyester, epoxies, and acrylics). A mineralresin interaction mechanism has been suggested. The organic molecules replace some of the ordered hydration water, released by the mineral at the temperatures generated by the exothermic polymerization reaction. A binder used for plugging hot drill holes contains mainly phosphoric slag, trisodium phosphate, and NaOH.

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