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This study was undertaken to assess the value of high-density rock as a mineral stabilizer for the asphalt coatings used in the manufacture of prepared roofings. The hope was that more mineral stabilizers could be used in the roofings than was the usual practice, thus saving on the high-energy, higher-priced asphalt. This is possible and desirable, but it entails increasing the current specification limits for the use of mineral stabilizers. Physical properties of coatings varied according to their volume proportions of mineral, irrespective of the mineral identity; these properties were modified in minor degree by the proportion of “fines” in the mineral. Accelerated weathering test results were influenced more by the kind of mineral and its particle size distribution than by the proportion of the mineral stabilizer. Indications are that a volume percent of 35 to 40 will prove to be the maximum practical proportion of mineral in either soft or standard asphalts. Two roofing mill trials showed the feasibility of these concepts, including also the maintenance of heat balances on the machine.
roofing, asphalts, stabilizers, volume dimensions, weathering, physical properties
Consultant, Building Materials and Systems, Montreal, P.Q.