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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.
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
"TRB's Transportation Research Record: Journal of the Transportation Research Board, No. 2360 contains 10 papers that study holistic approaches to maintenance and preservation of transportation infrastructure; guidelines for thermographic inspection of concrete bridge components in shaded conditions; bridge preservation by action type; fatigue testing and structural health monitoring of retrofitted web stiffeners on steel highway bridges; and, vulnerability of bridges exposed to scour. This issue also examines performance measures for bridge preservation; risk modeling of advanced deterioration in bridge management systems; modeling hurricane hazards and damage on Florida bridges; developing bridge management components that facilitate decision making; and, a method to assess bonding characteristics of membrane layers in wearing course on orthotropic steel bridge decks."--Pub. online blurb.
This research report presents recommended emulsion performance grade (EPG) specifications for asphalt emulsions used in three pavement preservation surface treatments (PSTs): chip seal, microsurfacing, and spray seals. These EPG specifications are climate-driven and applicable to traffic loads that are anticipated during the service life of each PST. The report also presents recommended test protocols for evaluating some of the properties of binders for which test methods are not readily available. The information contained in the report will guide materials and maintenance engineers in evaluating, selecting, and specifying the binders for use in PSTs that will provide acceptable performance and service life. The information contained in the report will be of immediate interest to materials and maintenance engineers and others involved in specifying and evaluating materials intended for use in PSTs.
"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.
Chip and scrub seal treatments are one of the most common pavement preservation practices, however, no performance specifications exist in Mississippi. Review of literature has shown the treatment of cores being successful in reducing the viscosity of aged asphalt pavements. The purpose of this thesis is to provide a basis for performance based specifications for surface treatments in Mississippi. This thesis provides information pertaining to viscosity, moisture loss, and frosted marble analysis of emulsions and the effects of rejuvenation after application of emulsions to aged asphalt pavements which are vital to the performance of the surface treatment. The objectives to this thesis are to determine and evaluate the effects of rejuvenation, frosted marble test, and moisture loss of emulsion applied to aged asphalt pavements. Results from these analysis' are favorable for developing or providing a basis for performance based specifications for surface treatments applied in Mississippi.