CEMENT RESISTANT TO SYNTHETIC OIL, HYDRAULIC FLUID, AND ELEVATED-TEMPERATURE ENVIRONMENTS

The scaling of concrete parking aprons under F/A-18 and B-1 aircraft a ssociated with chemical attack from spilled lubricants and heat has be en reproduced in the laboratory. Two different series of tests involvi ng the refluxing of lubricants, water, and concrete were performed. Th e first involved refluxing ground concretes, and the second, refluxed concrete-coated cylinders. Series 1 tests identified if the replacemen t materials were suspect to attack, and Series 2 was designed to measu re strength loss of ordinary portland cement- (OPC) coated specimens, as well as replacement materials. Over 10 different coatings and 10 di fferent inlay replacement materials were tested and compared to OPC co ntrol specimens. It was found that OPC lost 55 percent of its strength after 7 days, whereas neutral pH cements showed no reaction (Series 1 tests) and no strength loss (Series 2 tests). Only polyvinyl alcohol and polyacrylic acid coatings showed a significant reduction in attack (40 percent) of all the coatings tested.