Effect of Decay on Crushing Strength

The use of compression strength as an indicator of decay is advanced where quick results are required. An advantage is that test samples and decay procedures can be used identical to those used in the standard soil-block method. The results are based on tests of forty 3/4-inch cubes cut serially from one 3/4- by 3/4-inch piece of southern pine. The cubes were tested in radial compression below the proportional limit, and the modulus of elasticity of each cube was calculated. The cubes were then conditioned to constant weight and incubated on a substrate of soil topped by a feeder block prepared according to ASTM standards. The fungus used was Poria monticola, Madison number 698.

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