http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/itsdavis_ucprc_sumreports/rss Recent eScholarship items from Summary Reports Thu, 30 Jul 2026 03:04:18 +0000 https://escholarship.org/uc/item/96v7p9j9 This report summarizes a detailed report presenting the first and second year of field and laboratory measurements and statistical analyses and performance estimates for tire/pavement noise, permeability, ride quality, distress development, and friction properties of four types of asphalt pavement surface types used by the California Department of Transportation: open-graded asphalt concrete (OGAC), rubberized open-graded asphalt concrete (RAC-O), rubberized gap-graded asphalt concrete (RAC-G) and dense-graded asphalt concrete (DGAC). Tire/pavement noise was measured using the on-board sound intensity method (OBSI). A factorial experiment was developed and executed that considered these surface types, rainfall, traffic and age, with sections selected in the following age groups: less than one year old, one to four years old, and four to eight years old. A partial factorial was included for another type of open-graded mix, called F-mix. In addition, special sections placed by various... https://escholarship.org/uc/item/96v7p9j9 Mon, 21 Jun 2021 00:00:00 +0000 Ongel, Aybike Harvey, John T. Kohler, Erwin Lu, Qing Steven, Bruce D. Monismith, Carl L. https://escholarship.org/uc/item/7s01m4zz Moisture damage in asphalt pavements is a complex phenomenon affected by a variety of factors, and has not been fully understood, with major knowledge gaps in three areas: major factors contributing to moisture damage in the field, appropriate laboratory test procedures, and the effectiveness of treatments. Both field and laboratory investigations were performed in this study to provide additional information in these three areas. Statewide condition survey and field sampling were conducted to identify factors contributing to moisture damage, other than aggregate source. Statistical analysis revealed that air-void content, pavement structure, cumulative rainfall, mix type (DGAC versus RAC-G), use of anti-strip additive (lime or liquid), and pavement age significantly affect the extent of moisture damage. Laboratory experiments revealed that high air-void contents not only allow more moisture to enter mixes, but also significantly reduce the fatigue resistance of mixes in wet conditions.... https://escholarship.org/uc/item/7s01m4zz Fri, 30 Oct 2020 00:00:00 +0000 Lu, Q. Harvey, J. T. Monismith, C. L. https://escholarship.org/uc/item/70x4t0fp This document is a compilation of the executive summaries of the four reports developed for this research project. Each of the four individual reports covers a specific aspect of the project, and this report provides an overview of the entire project. For details on each of the tasks in the overall project, readers should access the individual reports. https://escholarship.org/uc/item/70x4t0fp Fri, 30 Oct 2020 00:00:00 +0000 Steyn, Wynand du Plessis, Louw Viljoen, Nadia van Heerden, Quinton Mashoko, Livison van Dyk, Esbeth Popescu, Lorina https://escholarship.org/uc/item/6pp4p46t Warm mix asphalt (WMA) is a relatively new technology. It was developed in response to needs for reduced energy consumption and stack emissions during the production of asphalt concrete, improved workability and compaction after long hauls and when using lower placement temperatures, and better working conditions for plant and paving crews. Studies in the United States and Europe indicate that significant reductions in production and placement temperatures, and, potentially, in related emissions are possible. However, concerns exist about how these lower production and placement temperatures could influence asphalt binder aging and, consequently, short- and longterm performance, specifically rutting. The overall objective of this warm mix asphalt study was to determine whether the use of technologies that reduce the production and construction temperatures of asphalt concrete mixes influences performance of the mix. The testing completed in this warm mix asphalt study provided... https://escholarship.org/uc/item/6pp4p46t Fri, 30 Oct 2020 00:00:00 +0000 Jones, D. https://escholarship.org/uc/item/2879t7j1 This study evaluates the open-graded friction course (OGFC) mix design proposed by the National Center for Asphalt Technology (NCAT) in order to suggest revisions to California Test 368, <em>Standard Method for Determining Optimum Binder Content (OBC) for Open-Graded Asphalt Concrete</em>. Three asphalt types (PG 64-10, PG 64-28 PM, and asphalt rubber [AR]), three aggregate types (Sacramento, Watsonville, and San Gabriel) and three gradations (coarse, fine, and middle) that comply with Caltrans specifications of binder and the 1/2 in. OGFC gradation and aggregate quality were used in this study. The NCAT approach includes selection of optimum gradation, selection of optimum asphalt binder content, and evaluation of moisture susceptibility using a modified Lottman method in accordance with AASHTO T 283 with one freeze-thaw cycle. It was found that, regardless of binder and aggregate types, the optimum gradation selected per the NCAT approach—usually a coarse gradation with fewer... https://escholarship.org/uc/item/2879t7j1 Fri, 30 Oct 2020 00:00:00 +0000 Tsai, Bor-Wen Harvey, J. T. Monismith, C. L. https://escholarship.org/uc/item/238539jv UCPRC staff attended the 2006 RPA conference in Palm Springs, CA. This document contains brief summaries of the technical papers/presentations given in both the technical and practical portions of the event. Items within specific papers that may be implementable by Caltrans are noted. Suggestions for future research, development, and information dissemination are given. https://escholarship.org/uc/item/238539jv Fri, 30 Oct 2020 00:00:00 +0000 Signore, James M. Wu, Rongzong Santucci, Larry Harvey, John https://escholarship.org/uc/item/1gs139mk Warm-mix asphalt (WMA) is a relatively new technology. It was developed in response to needs for reduced energy consumption and stack emissions during the production of asphalt concrete, long hauls, lower placement temperatures, improved workability, and better working conditions for plant and paving crews. Studies in the United States and Europe indicate that significant reductions in production and placement temperatures, and, potentially, in related emissions are possible. However, concerns exist about how these lower production and placement temperatures could influence asphalt binder aging and, consequently, short- and long-term performance, specifically rutting. The overall objective of the warm-mix asphalt study was to determine whether the use of technologies that reduce the production and construction temperatures of asphalt concrete mixes influences performance of the mix. The objective of this part of the study was to identify limitations and benefits of using warm-mix... https://escholarship.org/uc/item/1gs139mk Fri, 30 Oct 2020 00:00:00 +0000 Jones, David Farshidi, Frank Harvey, John T. https://escholarship.org/uc/item/7hp576vg <p>This report provides a summary of the results of the various studies completed in the Partnered Pavement Research Program (PPRC) during the period 2000–2004. In addition, preliminary findings of investigations, initiated but not yet implemented during this period, are included. The results are based on the combined results of analytical developments, laboratory testing of pavement materials, and HVS tests of full-scale pavement test sections. Summaries of developments in the following areas are included: 1. Asphalt Mixes — Materials and Flexible Pavement Studies. These include studies of mix fatigue, moisture sensitivity, reflection cracking, performance of drained and undrained pavements, and those associated with I-710 freeway rehabilitation. 2. Concrete — Materials and Rigid Pavement Studies. These include: evaluation of long-life rehabilitation strategies, results of the SR-14 (Palmdale), HVS rigid pavement studies, dowel retrofit investigations on US-101 and the SR-14... https://escholarship.org/uc/item/7hp576vg Wed, 7 Jul 2010 00:00:00 +0000 Harvey, John T Monismith, Carl L. Nokes, William Coetzee, N. F https://escholarship.org/uc/item/5r24b3dg <p>This report summarizes the investigations undertaken by the University of California Pavement Research center between 1998 and 2005 to assess Caltrans strategies for the construction of rigid pavements, specifically jointed plain concrete pavement. The overall objectives of the study are reviewed and the studies undertaken to meet these objectives, namely desktop studies and laboratory and full-scale experiment are discussed. The reports and recommendations from each study are listed, as well as some details on how the recommendations have been implemented.</p> https://escholarship.org/uc/item/5r24b3dg Mon, 21 Jun 2010 00:00:00 +0000 Jones, David Harvey, John T Kohler, Erwin R.