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The Department desires to evaluation asphalt modifiers to enhance aggregate retention for seal coats. We have been looking at various asphalt modifiers that in past years have included latex and neoprene type additives. Recently, the asphalt industry has developed various polymer additives that are marketed to solve many of the present problems. These additives are promoted to give "rubbery" characteristics to the asphalt binder materials during the hot pavement surface temperature periods of the summer months when other asphalt binders will become soft and allow loss of the aggregates. These additives are usually costly and increase the project costs significantly. Therefore, it is important to evaluate the cost-effectiveness of their use. After one year of service, the control sections have suffered significant loss of the aggregate and the sections are flushed and asphalt is tracking in the direction of traffic. The polymer modified sections are in better shape than the control sections. All have suffered the usual snowplow damages, such as abrasion of the aggregate by the sliding snowplow shoes and "scuffing" by the bouncing snowplow blade.
"ASTM Publication Code Number (PCN) 04-011080-08. - "Sponsored by ASTM Committee D-4 on Road and Paving Materials."-- Foreword. - Includes bibliographical references and indexes. - Electronic reproduction; W. Conshohocken, Pa; ASTM International; 2011; Mode of access: World Wide Web; System requirements: Web browser; Access may be restricted to users at subscribing institutions.
Modification with polymer enhances the low and high temperature properties of asphalt cement and surface treatments constructed with polymer-modified binders are claimed to provide better initial and long term aggregate retention, increased resistance to flushing and longer surface treatment life. Eight surface treatments were placed using polymer-modified high float emulsion in Northern and Northwestern Regions in 1987 as part of the routine construction and maintenance surface treatment programs. Special criteria were not used when selecting the locations. Styrelf HF-150P emulsified asphalt was used on all the 1987 trials to determine if polymer-modified high float emulsions could be used under normal construction procedures and to monitor the claims of improved performance. The control sections were built with standard HF-150S emulsified asphalt next to the trial sections. The trial and the control sections will be monitored for performance annually.
Following the five-year study performed to investigate the behavior of binders and asphalt mixtures containing polymer modifiers, it was determined that an insufficient amount of time had elapsed to allow any determinations to be made based upon the special field test sections. The study reported herein was to extend that initial time and to study in depth those special test sections, using visual observations coupled with resulting tests performed on samples extracted from the sections and comparisons with the original data developed in the original research. The research includes laboratory testing of field samples, determining the aging effect on the control and modified binders and corresponding effect on the mixtures, and visual evaluations. Retained samples of the original asphalts were also evaluated for potential performance as determined by the performance-based asphalt binder specification developed by the Strategic Highway Research Program. Four hot mix pavement field projects were constructed in the Tyler, Lufkin, San Antonio, and Childress Districts (10, 11, 15, and 25, respectively), and two seal coat projects were placed in the Odessa and Bryan Districts (6 and 17).
Polymer modified asphalts have recently been the focus of much attention in the U.S. due to claims that polymer additives will lengthen the life of an asphalt pavement. Much of the published research on this topic has been concentrated on the effects of polymer modifiers on binder and mixture properties. The goal of this testing is to predict from laboratory testing the actual field performance of an asphalt concrete. Over the years, specifications have been developed for conventional asphalts that allow pavement performance to be predicted from certain binder tests. These conventional binder tests do not fully address the special characteristics of polymer modified asphalt binders and need revision to be an effective tool in predicting pavement service life. This paper presents the findings of a two-part laboratory research program intended to relate binder and mixture properties of polymer modified asphalts. The preliminary testing involved five asphalt binder types and a variety of binder and mixture tests. Promising test procedures were further investigated in the final testing program where ten asphalt binders were examined. Simple linear regression was used to determine the strength of a relationship between pairs of binder properties and mixture properties. The preliminary testing showed penetration, toughness and tenacity, and force ductility to have the most promise in predicting mixture performance. The final testing contained enough data to be analyzed with both simple linear regression and multiple regression. Penetration, toughness and tenacity, force ductility again were the test procedures that had binder properties that correlated well with mixture properties.