Physical and Mechanical Properties of Epoxy–Bauxite Mortar of High-Friction Surface Treatment
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
Highfriction surface treatment (HFST) has been widely utilized by state departments of transportation (DOTs) to reduce friction related vehicle crashes. However, although many studies have been conducted to enhance the durability of HFST, limited information is available on the properties of the HFST epoxy–bauxite mortar. Although an HFST may contribute little to the pavement structural capacity, its epoxy–bauxite mortars have several distinguishing properties that may result in incompatibilities between the HFST and underlying pavement. Consequently, knowledge of the HFST epoxy–bauxite mortar properties is critical to ensuring its durability. This paper determined the physical and mechanical properties of epoxy–bauxite mortar for HFSTs. An empirical method was developed to estimate an approximate binder content. Comprehensive laboratory testing determined the properties, including density, Poisson’s ratio, coefficient of thermal expansion (CTE), dynamic modulus, and crack resistance. It was found that the HFST epoxy–bauxite mortar has a CTE significantly higher than that of hot-mix asphalt (HMA) mixtures and portland cement concrete (PCC). The HFST epoxy–bauxite mortar basically is a viscoelastic material with very low water-absorption ability and a dynamic modulus greater than that of a HMA mixture. The test results of fracture energy, tensile strength, and crack progression rate (CPR) consistently indicated that the HFST epoxy–bauxite mortar has very good cracking resistance.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research project was sponsored by the Indiana Department of Transportation in cooperation with the Federal Highway Administration through the Joint Transportation Research Program (JTRP) of INDOT and Purdue University. The authors thank Mike Holowaty, Tim Wells, Prakash Patel, Joe Bruno, and Mike Nelson of INDOT; Laura Slusher of the Indiana Local Technical Assistance Program (LTAP); Rick Drumm of FHWA Indiana Division; and Brent Wendholt of Indiana Dubois County for their technical guidance. Thanks are extended to Ayesha Shah of North Central SuperPave Center and Mike Moredock of INDOT for their help in carrying out testing. The authors recognize the assistance from Dan Patacca of E-Chem.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 3, 2019
Accepted: Nov 20, 2019
Published online: Mar 30, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 30, 2020
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