Download Free Field Performance And Evaluation Of Slurry Seals Book in PDF and EPUB Free Download. You can read online Field Performance And Evaluation Of Slurry Seals and write the review.

As part of the overall research program of evaluating asphalt emulsion slurry seal as a pavement maintenance material, 31 duplicate 500-ft test sections were constructed on U.S. 6 between Adel and Waukee in Dallas County during September and October of 1978. These test sections included combinations of eight aggregates, two gradings, three asphalt emulsions, two mineral fillers, and a range of emulsion contents determined by laboratory mix designs. The emulsion contents of the test sections varied from 10.3% for Section 7A (Ferguson coarse) to 32.9% for Section 31A (lightweight aggregate). The post-construction performance evaluation of the test sections, consisting primarily of the friction tests and surface appearance observations, was conducted at different time intervals up to 24 months after construction. At the 24-month final evaluation, most of the test sections had carried a total of 1.4 million vehicles.
Extensive programmed laboratory tests involving some 400 asphalt emulsion slurry seals (AESS) were conducted. Thirteen aggregates including nine Iowa sources, a quartzite, a synthetic aggregate (Haydite), a limestone stone from Nebraska, and a Chat aggregate from Kansas were tested in combination with four emulsions and two mineral fillers, resulting in a total of 40 material combinations. A number of meetings were held with the Iowa DOT engineers and 12 state highway departments that have had successful slurry seal experiences and records, and several slurry seal contractors and material and equipment suppliers were contacted. Asphalt emulsion slurry seal development, uses, characteristics, tests, and design methods were thoroughly reviewed in conjunction with Iowa's experiences through these meetings and discussions and through a literature search (covering some 140 articles and 12 state highway department specifications). It was found that, while asphalt emulsion slurry seals (when properly designed and constructed) can economically improve the quality and extend the life of existing pavement surface, experiences with them had been mixed due to the many material, slurry, and construction variables that affect their design, construction, and performance. The report discusses those variables identified during the course of the project and makes recommendations concerning design procedures, design criteria, specifications and the means of evaluating them.
Slurry seals and micro-surfacing (slurry surfacing systems) are widely used in pavement maintenance programs as primary surface treatments for extending pavement life and restoring serviceability function of structurally adequate pavements. Compared to hot mix asphalt overlay, these treatments are more cost-effective, energy-efficient, and environmentally friendly. In order to be effective, a rational mixture designed must be carried out to determine mixture components and proportions to be used in the field. In spite of their widespread use, mixture design and testing methodologies for slurry surfacing systems are still lacking. Current design practices and testing procedures are based on the art and experience of the contractor, and checked with tests with no known relation to field performance. The main objective of this study is to develop an improved the mixture design framework and testing methodologies for slurry surfacing system. Candidate test methods for evaluating critical mixture performance parameters related to common field distresses were evaluated in the laboratory, and modified as needed. This included test for workability, early raveling, and moisture induced raveling, bleeding and rutting. Promising candidate test methods were selected based on repeatability, sensitivity to design factors, simplicity, and cost. A unified mixture design framework for both slurry seals and micro-surfacing that incorporates the candidate test methods was developed. It allows the optimum emulsion content to be selected based on minimizing moisture induced raveling and bleeding. The mixture design procedure developed was verified with design parameters from field projects around the country. The results showed that the developed procedure yield design parameters similar to those used in the field. This finding is promising given that current mixture design practices rarely give design parameters in agreement with those known by contractors to give satisfactory field performance. It is recommended that the modified mixture design procedures developed in this study be adapted as an initial basis for developing a standardized mixture design framework for slurry surfacing systems. Additional materials need to be tested to ensure that the procedure is applicable to common materials used. Finally, evaluation of field projects is needed to establish performance limits.
This report describes the placement and early performance of experimental test sections on which No. 8 modified slurry seal and precoated No. 8 chip seal surface treatments were placed. From observations made during the installation and the performance after one year, it is concluded that the No. 8 modified slurry seal treatment has good potential but that use of the No. 8 chip seal treatment is not feasible.
This paper presented a study to evaluate the performance of chip seals for higher traffic volume roads. The evaporation test, bitumen bond strength (BBS) test, and Vialit test were used to investigate curing and adhesive behavior. For the laboratory performance, the third-scale model mobile load simulator (MMLS3) was employed to test for aggregate retention, bleeding, and rutting performance. In field, a total of ten test sections were constructed on three different traffic volume roads using different materials and seal types. Some of the field samples were extracted and moved to the laboratory for performance testing. Also, the field sections were monitored to compare the field performance with the laboratory performance. The main findings presented in this paper were as follows: (1) the laboratory test results indicated that the use of polymer modified emulsions (PMEs) improved the chip seal performance in all areas, i.e., curing and adhesive behavior, aggregate retention, bleeding, and rutting; and (2) the field observations indicated that PME-A (styrene butadiene styrene (SBS) polymer-modified emulsion) performs the best of all the emulsions, regardless of seal type and traffic volume.
Roads and Airports Pavement Surface Characteristics contains the papers presented at the 9th International Symposium on Pavement Surface Characteristics (SURF 2022, Milan, Italy, 12-14 September 2022). The symposium was jointly organized by the Italian company that manages Italy’s National Roads (ANAS –Ferrovie dello Stato Italiane Group), the World Road Association (PIARC) and Politecnico di Milano. The contributions aim to improve the quality of pavement surface characteristics while accomplishing efficiency, safety, sustainability, and addressing new generation mobility needs. The book covers topics from emerging research to engineering practice, and is divided in the following sections: Advanced and performing construction methods and equipment Next generation mobility Data monitoring and performance assessment Surface features and performances| Maintenance and preservation treatments Pavement management Economic and political strategies Safety and risk issues Minimizing road impacts Sustainability and performances issues about materials and design Pavements surfaces and urban heat islands Weather conditions impact Airport pavements Roads and Airports Pavement Surface Characteristics is of interest to academics, engineers and professionals in the fields of pavement engineering, transport infrastructure, and related disciplines.