Browsing by Author "Trimble, Nicholas Robert"

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Experimental assessment of aggregates
(Montana State University - Bozeman, College of Engineering, 2007) Trimble, Nicholas Robert; Chairperson, Graduate Committee: Robert L. Mokwa
An extensive suite of geotechnical laboratory tests were conducted to quantify differences in engineering properties of three crushed aggregates commonly used on Montana highway projects. The material types are identified in the Montana Supplemental Specifications as crushed base course (CBC, 1.5 to 2-inch maximum particle sizes) and crushed top surfacing (CTS, 0.75-inch maximum particle size). All aggregates were open-graded and contained relatively few fines. Results from R-value tests and direct shear (DS) tests performed on large samples (12-in by 12-in) indicate the CBC aggregates generally exhibited higher strength and stiffness than the CTS aggregates. Drainage capacity was quantified by conducting multiple saturated constant head permeability (k) tests on 10-inch-diameter samples of each material type.