详情

原文传递 HOLLOW-CYLINDER TENSILE TESTER FOR ASPHALTIC PAVING MIXTURES.

题名：	HOLLOW-CYLINDER TENSILE TESTER FOR ASPHALTIC PAVING MIXTURES.
作者：	Al-Khateeb-GG; Buttlar-WG
关键词：	Asphalt-mixtures; Creep-; Creep-compliance; Dense-graded-mixtures; Equations-; Hollow-cylinder-tensile-tester; Indirect-tensile-test; Low-temperature; Mechanical-properties; Polymer-asphalt; Prototypes-; Tensile-strength; Tension-tests
摘要：	Obtaining fundamental mechanical properties of asphalt paving mixtures is a key component of performance-related mixture design and production control. Different testing modes, including the Superpave Indirect Tensile Test (IDT) and the direct tension mode, are used to obtain fundamental properties of asphalt mixtures, such as creep compliance and tensile strength. In this study, a hollow-cylinder tensile tester (HCT) was developed and used to obtain such properties for asphalt mixtures at low temperatures. The HCT is a compact, portable, and operationally simple surrogate test device for the IDT. In the HCT test mode, an internal pressure is applied to the inner cavity wall of the hollow cylinder through a flexible membrane, which produces a hoop (tangential) tensile stress in the cylinder. Closed-form equations are presented to determine creep compliance and tensile strength for thick-walled cylinders under ideal conditions. In the event of eccentrically-cored specimens (non-uniform wall thickness) or partial loading of inside hollow cylinder wall, three-dimensional finite element correction factors are presented, which can be used to obtain accurate measures of creep compliance and tensile strength from raw measurements. Two asphalt mixtures, a dense-graded surface course mixture (9.5-mm top aggregate size typical Illinois limestone) and a polymer-modified (PG70-34) sand-asphalt mixture, were tested in this study using both the HCT and IDT. Delrin plastic was also tested as a reference material using the HCT for validation purposes. Although the HCT is still in the early prototype stage, the preliminary results seem very reasonable when compared to the IDT. As expected, differences in tensile strengths between the IDT and HCT were observed due to differences in specimen geometry, size, and stress states.
总页数：	Conference Title: Mid-Continent Transportation Symposium 2000. Location: Ames, Iowa. Sponsored by: Iowa State University
报告类型：	科技报告