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Title: Scanning electron microscope evaluation of fabric in impact-compacted kaolinite
Authors: Patrick, David M.
Keywords: Kaolinite
Soil compaction
Compacted soil
Scanning electron microscopes
Georgia kaolinite
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: Specimens of Georgia kaolinite were compacted on 4-in. molds at three compaction efforts having 7,425, 42,750, and 78,750 ft-lb/cu ft of energy, respectively. Samples representing each effort were compacted at water contents which were 5 and 1 percent dry and 1 and 5 percent wet of optimum water content. After compaction, these samples were studied in the scanning electron microscope, which revealed that the compaction had produced some degree of dispersed or face-to-face orientation of the clay platelets. The dispersed orientation was not particularly enhanced at the higher compaction efforts. Also, there was no evidence of any enhancement of this orientation on the wet side of optimum for those samples compacted at 42,750 and 78,750 ft-lb/cu ft. The samples compacted at 7, 425 ft-lb/cu ft did exhibit excellent dispersed orientation at 5 percent wet of optimum. The development of dispersed fabric is believed to be due more to the actual water content than to whether the samples are wet or dry of optimum moisture content, and the dispersed fabric is probably related to the plastic limit.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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