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Journal of Undergraduate Research

Keywords

microcracking, cement-treated bases, CTBs, asphalt-surfaced pavements

College

Ira A. Fulton College of Engineering and Technology

Department

Civil and Environmental Engineering

Abstract

This study was funded in the spring of 2009 and commenced immediately afterward. The scope of the project included researching the effectiveness of microcracking of cement-treated bases (CTBs) in construction of asphalt-surfaced pavements. Microcracking is a method of reducing the amount of “block cracking” or “shrinkage cracking” that typically propagates up through the asphalt layer overlying a CTB layer. Microcracking involves making several passes over a newly constructed CTB with a heavy roller to induce a network of hairline cracks throughout the layer. Identifying equipment that can be used to determine how many passes are adequate was the focus of this project. The research included field work, where distress surveys were performed and extensive testing was conducted with the use of portable instruments; laboratory work, where material properties were tested in the BYU Highway and Materials Laboratory; and literature reviews, where the most recent studies on microcracking and CTB were compiled.

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