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Strength and Bulk Density of Compacted Mixtures of Kaolinite and Glass Beads¹

ABSTRACT

Compacted mixtures of kaolinite and glass beads were used to test a hypothesis that the number of contact points of a matrix influences its strength. Four glass bead mixtures were used: (1) a single-sized bead, (2) 2 sizes of beads designed to permit cubic, but not tetrahedral, packing of the largest size beads, (3) 2 sizes of beads designed to permit tetrahedral packing of the largest sized beads, and (4) 4 sizes of beads designed to permit tetrahedral packing. From 2 to 40% clay was added to each glass bead mixture; moisture tension at time of compaction ranged from 1/3 to 15 bars.

The 4-component mixture with clay contents above 25% gave the highest dry strength. Maximum bulk densities in all glass bead mixtures were attained at clay contents of 20 to 30%. Maximum strength and bulk density for each mixture was attained at a moisture content between 1 and 5 bars tension regardless of clay content.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Texas Agr. Exp. Sta.

² Research Soil Scientist, USDA, Bushland, Tex.

Received for publication February 25, 1964. Accepted for publication August 7, 1964.