Download or read book Evaluation of Limestone Aggregates in Asphalt Wearing Courses Phase II written by Prithvi S. Kandhal and published by . This book was released on 1992 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Limestone Aggregate in Asphalt Concrete Wearing Courses written by Deepak Arun Manglorkar and published by . This book was released on 1991 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Limestone Coarse Aggregate in Asphalt Concrete Wearing Courses written by Deepak Arun Manglorkar and published by . This book was released on 1993 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted to evaluate the performance of limestone when used in the coarse aggregate fraction of asphalt concrete wearing courses. Three field test sites containing one experimental section each were constructed to study in-situ performance. The surface course mixes in experimental sections had 30 to 40 percent limestone in lieu of gravel in the coarse aggregate fraction. The control sections had 100% gravel as coarse aggregate for comparison. The in-situ mixes were replicated in the laboratory by using the same job mix formula and materials. Strength, moisture susceptibility and polishing properties mixes were measured in the laboratory. Acid insoluble tests, petrographic analysis and polish tests were also performed on the coarse aggregates.

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the though that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemi nation. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 37 (thesis year 1992) a total of 12,549 thesis titles from 25 Canadian and 153 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 37 reports theses submitted in 1992, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.

Download or read book Highway Research Abstracts written by and published by . This book was released on 1994 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the MMLS3 for Accelerated Wearing of Asphalt Pavement Mixtures Containing Carbonate Aggregates written by Cristian Druta and published by . This book was released on 2014 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to develop an accelerated wearing protocol for assessing the susceptibility of asphalt surface mixtures to polishing. This was the second phase of the study. The first phase focused on assessing the characteristics of selected carbonate aggregates available in Virginia that are normally classified as polishing and thus not considered suitable for use in pavements except for those roads with an average daily traffic of less than 750 vehicles per day. The selection of aggregates used in pavements is critical in producing surfaces that will continue to provide good skid resistance through a lengthy service life.The specifications of the Virginia Department of Transportation (VDOT) call for non-polishing aggregate for use in most surface layers. The study was aimed at making use of locally available polishing aggregates that can reduce the cost of asphalt mixtures while maintaining satisfactory wearing and skid characteristics of the pavements. The objectives of the research were (1) to evaluate the polishing/wear features of mixtures containing limestone aggregate in the laboratory using an accelerated method; (2) to compare friction properties of the laboratory-polished specimens with actual pavement friction measurements; and (3) to compare friction properties of mixtures containing carbonate rock or blends with those of mixtures with non-carbonate rocks.The study included three types of aggregates, i.e., limestone, quartzite, and granite, and blends of these aggregates. The surface mixtures studied were conventional SM-9.5 and SM-12.5 mixtures containing various percentages of limestone, limestone recycled asphalt pavement, and limestone-granite/quartzite blends. The suggested test protocol to evaluate the polishing of asphalt concrete specimens prepared in the laboratory was developed using the third-scale model mobile load simulator (MMLS3). The MMLS3 is capable of applying realistic rolling wheel contact stresses similar to those on highways from the moving traffic.The skid resistance, friction, and texture of actual pavement surfaces and laboratory-fabricated specimens were measured after different polishing intervals. Skid resistance and frictional characteristics were measured by the British pendulum tester, dynamic friction tester, and locked-wheel skid tester; the circular texture meter was used to measure surface macrotexture. Results showed that the MMLS3 can be used to simulate traffic wearing of asphalt concrete specimens of different shapes and sizes in the laboratory including core specimens removed from existing pavements and that the BPT is effective in characterizing changes in friction on specimens that are subjected to simulated trafficking via the MMLS3. Further, test specimens should have a high initial macrotexture and mixtures should have good stability so that the wearing effects are focused on the aggregates. The study recommends that the Virginia Center for Transportation Innovation and Research (VCTIR) work with Virginia Tech and VDOTs western districts to design and conduct an experiment to explore a series of carbonate / non-carbonate aggregate blends for asphalt mixtures and that the mixture gradations be designed to prevent the absence of macrotexture from impacting the ability to measure the polish of the coarse aggregate structure of the experimental mixtures. VCTIR should purchase tires with different tread patterns and try them on the MMLS3 to evaluate the polishing rate of specimens in more detail.

Download or read book Transportation Research Record written by and published by . This book was released on 1996 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Skid Resistance of Asphalt Wearing Courses Made with Limestone Aggregates written by Larry Crowley and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Evaluation of the Continued Use of Coral Limestone Aggregate in Hot Mix Asphalt Construction Case Study Barbados written by Philip A. Tudor and published by . This book was released on 1998 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Testing and Evaluation of Stabilized Wastes Performance of Stabilized Materials and New Aggregate Tests written by and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The seven papers in the first group describes investigations related to materials such as fly ash, AMD sludge, phosphogypsum, FGD gypsum, fluorogypsum, oil and gas well sludge, and MSW combustion bottom ash. The other 2 groups focus on performance of stabilized materials and new aggregate tests.

Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1994 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 37 (thesis year 1992) reports a total of 12,549 thesis titles from 25 Canadian and 153 US universities (theses submitted in previous years but only now reported are indicated by the thesis year shown in parenthesis). The organization, like that of past years, consists of thesis titles arrange

Download or read book Master s Theses Directories written by and published by . This book was released on 1993 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Download or read book Evaluating Performance of Limestone Prone to Polishing written by Zoltán Radó and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project evaluated the effect of blending Vanport limestone and other aggregates on the frictional surface characteristic properties of constructed trial road surfaces. The study undertook the evaluation of the performance of different mortar fractions and aggregate concentrations to determine the effect of coarse aggregate usage in the top mortar layer on pavement friction performance, as well as the effect of the substitution of different aggregates in place of Vanport limestone. The project developed a test matrix to evaluate the effect of the changes in these factors on portland cement concrete using state-of-the-art laboratory test equipment for assessing surface characteristics and using accelerated wearing for the evaluation of long-term pavement surface performance.

Download or read book Performance Evaluations of Crushed Sandstone Aggregates in Bituminous Bases written by David Q. Hunsucker and published by . This book was released on 1990 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objective of the research effort was to develop historical performance data for bituminous sandstone pavements and bituminous limestone pavements relative to visual distress, pavement rutting characteristics, and structural condition using deflection measurements. Data relative to Road Rater deflections, pavement rutting, condition ratings based on subjective visual surveys and objective data such as skid resistance and rideability, were collected and analyzed during the course of the study. It was concluded, based upon information gained during the evaluation period and summarized in this report, that pavements constructed with bituminous sandstone bases did not develop excessive rut depths, were more resistant to shoving and pushing, but appeared to exhibit cracking at an earlier age than pavements constructed with bituminous limestone bases. The use of bituminous sandstone mixtures addresses problems such as haul costs, rutting, skid resistance, etc. Field engineers indicated that although bituminous sandstone surface mixtures have a slight tendency to ravel, they are very resistant to rutting and applications of bituminous sandstone base and surface mixtures have been very successful in their estimation.

Download or read book Surface Energy Characteristics of Granite and Limestone Aggregates with Respect to 2D and 3D Surface Roughness Measurements written by Anjana Thoroppady Kittu and published by . This book was released on 2013 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface energy properties of aggregates and asphalt binders can be used to select appropriate aggregate and asphalt binder combinations for the construction of moisture durable pavements. Sessile drop device is an effective method to determine the surface properties of aggregates and asphalt binders by performing direct contact angle measurements. However, the variations in surface roughness could impact the contact angle formed on the aggregate surface. Therefore, the present study was intended to evaluate the contact angle measurements on aggregate surfaces at different levels of surface roughness using the sessile drop device. Large size granite and limestone rock specimens were obtained and cut into appropriate sizes to create flat surfaces for contact angle measurements. The samples were subjected to a series of polishing stages using different particle sizes of silicon carbide and aluminum oxide grits. Contact angle measurements were subsequently conducted using three probe liquids on the unpolished surface as well as on the specimens subjected to different levels of polishing. Surface roughness measurements were also performed after each polishing stage using a two-dimensional profilometer and a three dimensional optical profilometer. The surface roughness decreased as the polishing progressed. The results from this study showed that as the surface became smoother, the values of contact angles formed by the probe liquids decreased, and attained consistent values after polishing with silicon carbide 1000 grit. The surface energy components also showed consistent results from the silicon carbide 1000 polishing stage onwards. Present results imply that initial polishing of aggregate surface is required to obtain consistent results from the sessile drop device. Correlation between two methods of measurements of surface roughness indicates that both methods could be useful for measurement of rock samples. Once the surface roughness is standardized to obtain representative contact angle, the sessile drop device can be used to compare different aggregates and select appropriate aggregate-asphalt binder combination for the construction of durable pavements. The surface energy results obtained from the contact angle measurements were used to evaluate the energy ratio and the compatibility ratio parameters for moisture damage potential of the two aggregate-binder combinations along with PG 64-22 neat binder. The results obtained indicate that ER and CR could be used as power tools for material selection.

Download or read book Sustainable Designed Pavement Materials Volume 2 written by Yue Xiao and published by MDPI. This book was released on 2020-12-06 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue “Sustainable Designed Pavement Materials” has been proposed and organized as a means to present recent developments in the field of environmentally-friendly designed pavement materials. For this reason, articles included in this special issue relate to different aspects of pavement materials, from industry solid waste recycling to pavement materials recycling, from pavement materials modification to asphalt performance characterization, from pavement defect detection to pavement maintenance, and from asphalt pavement to cement concrete pavement.

Download or read book Guide for Pavement Friction written by and published by AASHTO. This book was released on 2008 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.