Key points are not available for this paper at this time.
A fine-grained soil was mixed with 1% by volume of 20-mm-long synthetic fibers. Laboratory specimens were compacted at various water contents and tested in unconfined compression. Specimens compacted wet of optimum were found to have somewhat greater strength (up to 25%) and strain to failure with fibers in comparison with specimens without fibers. Dry of optimum, there was little or no benefit from the fibers. Nylon and polypropylene fibers gave similar results. Mixing the fiber into the soil was difficult; especially for the smaller (less than 0.20 mm diameter) fibers.
Dean R. Freitag (Fri,) studied this question.