R A CYPHERS, PE and A R WHITLOCK, PhD, PE
WDP & Associates, Inc., Consulting Engineers
A testing program was conducted to compare an omni-directional with a uni-directional freeze/thaw test on moulded brick. The brick were tested in accordance with the procedures outlined in ASTM C67, “Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile,” and Dutch Standard NEN 2872, “Determination of Frost Resistance of Stony Building Materials – Single Sided Freezing in a Fresh Water Environment.” The effects of the tests were compared by assessing visual damage and measuring changes in ultrasonic pulse velocity measurements and 24 hour cold water absorption values on each brick before and after freeze/thaw testing. In addition to the freeze/thaw tests, the brick were also tested for basic physical properties including compressive strength, absorption, and spitting tensile strength.