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Glass is far inferior to paper, plastic and Styrofoam in terms of insulation. Thermal conductivity in terms of BTU/(feet - hour - degrees F) is 1.82 for glass, 0.09 for paper, 0.06 for Styrofoam. The conductivity of plastics varies depending on the materials: for polypropylene and polycarbonate, the thermal conductivity values are 0.69 and 0.35, respectively.
You want to make sure that the Styrofoam seals in your pour as much as possible, the idea is to insulate it from the cold as much as possible. As the concrete's Portland cement cures, it will produce its own heat (hence the exothermic reaction).