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The problem of accelerated weathering of various construction materials is a subject equally important to consumers and producers. Research work has been handicapped by the lack of suitable laboratory equipment to simulate weathering.
The Materials and Research Dept. of the California Division of High-ways has developed a special unit, which employs infrared lamps as the principal agent for inducing change in the test material. This weathering unit is being used in a study of the durability of various types of asphaltic materials, especially the paving grade asphalts.
A description of the equipment and test procedure now in use is given, together with methods for operation. Test data are presented to show the ability of the apparatus to induce identical changes in specimens placed in any position in the machine. A description of the present research program involving the calibration of the unit in terms of field service time for paving grade asphalts is presented, together with a discussion of the difficulties encountered in such a calibration study.
Associate Chemical Testing Engineer, California Division Highways, Sacramento, Calif.