Superpave aggregate qualification includes the fine aggregate angularity (FAA). Fine aggregate angularity levels used in the Superpave system are below 40, 40 to 45 and above 45. The higher values are specified for layers near the surface and for higher traffic levels. The objective of this study was to address the effect of fine aggregate angularity on asphalt mixture rutting performance.
aggregate angularity within the mix (low, medium and high angularity). Trinidad Lake Asphalt (TLA) was the study binder. Aggregate abrasion tests evaluated the wear potential of each type of aggregate. 2.2 AIMS imaging system test The Aggregate Imaging System (AIMS) was used for imaging analysis to
The effect of fine aggregate angularity (FAA) on the skid-resistance of asphalt pavement was investigated in the paper. To achieve the objective, four fine aggregates with various FAA values were used in stone matrix asphalt (SMA) and conventional asphalt concrete (AC), separately.
This report presents the results of laboratory testing to validate the use of Fine Aggregate Angularity (FAA) measurements with the Superpave method of Hot Mix Asphalt (HMA) design. A search of literature and Minnesota FAA data was conducted in preparation for FAA testing of aggregates …
Fine aggregate angularity (FAA) requirements, one of the aggregate consensus properties, has generated considerable debate in some areas of the country. Adopting an FAA requirement of 45 percent for high traffic pavements has changed the number of sources available for asphalt mixtures. Superpave also provides a limit on flat and elongated ...
particular interest for this research are the fine aggregate angularity requirements and the possible interactions with asphalt content and performance grade. 1.1.1 Current Angularity Requirements for Fine Aggregates Superpave has defined limits on the angularity of fine aggregates …
bound layer between the surface course (asphalt concrete or portland cement concrete) and the subgrade. This layer is sometimes subdivided ... angularity, and roughness of aggregates on base course performance, used this form of shape description for charac-terizing the five aggregates …
T1 - Investigation of superpave fine aggregate angularity criterion for asphalt concrete. AU - Johnson, Ed. AU - Li, Xinjun. AU - Zofka, Adam. AU - Marasteanu, Mihai O. AU - Clyne, Timothy R. PY - 2007/12/1. Y1 - 2007/12/1. N2 - Fine aggregate angularity (FAA) requirement is one of the aggregate consensus properties recommended by SHRP.
Implementation of a Fine Aggregate Angularity Test Tim Aschenbrener 1.0 Introduction Rutting of a hot mix asphalt (HMA) pavement is primarily related to aggregate structure and secondarily related to asphalt cement stiffness. One of the key components of the aggregate structure is the angularity of the fine aggregate.
The Wisconsin Department of Transportation (WisDOT) has implemented the Superpave recommendations in the 2000 Supplemental Specifications. This research was directed towards better understanding of the influence of angularity of fine aggregates, asphalt content, and performance grade of asphalts on hot mix asphalt (HMA) performance.
Aggregate shape properties, such as form, angularity, and surface texture, highly influence the performance of hot-mix asphalt (HMA). Rutting is related to aggregate angularity and form, which affects the interlock among particles.
This VMA criteria is a function of only the nominal size of aggregate regardless of shape, texture, or gradation. The Superpave volumetric mixture design process contains a required minimum value for fine aggregate angularity (FAA) as a function of traffic level and position of …
aggregate angularity and mix performance in existing studies and present experimental results of the influence of coarse aggregate angularity (CAA) on the mechanical behaviour of dense graded asphalt mixtures. Four mixtures of different classes of coarse aggregate angularity (rounded …
coarse-aggregate angularity for AC-16 asphalt mixtures was rela-tively less significant. On the other hand, the observed downward. 0.001 0.01 0.1 1 10 100. 0. 1000. 2000. 3000. 4000. 5000. 6000. 7000
texture, many specifications for coarse aggregates used in asphalt concrete require a minimum percentage of aggregates with crushed faces as a surrogate angularity and texture requirement. Flaky Laminated rocks Flaky and elongated aggregates are undesirable for asphalt concrete, since they are difficult to compact during construction and are easy to break Surface texture Glassy Natural flint ...
Fine Aggregate Angularity Asphalt Pavement Analyzer No restrictions. Document available from: National Technical Information Services, Springfield, ia 22161 19. Security Class (this report) 20. Security Class (this page) 21. No. of Pages 22. Price Unclassified Unclassified 100
2.1 Test Methods to Estimate Aggregate Angularity 8 2.2 Effect of Aggregate Angularity on HMA Performance 18 Chapter 3 Research Methodology 27 3.1 Materials Selection 27 3.1.1 Aggregates 28 3.1.2 Asphalt Binder 28 3.1.3 Hydrated Lime 29 3.2 Mix Design Method 30 3.3 Aggregate Angularity Tests Performed 34
With the recent introduction and acceptance of Superpave design criteria for hot mix asphalt, designers have had difficulty meeting the minimum voids in the mineral aggregate (VMA) requirements. VMA is affected by compactive effort, gradation, and aggregate angularity.
Komaragiri et al. demonstrated the feasibility of using Bullet physics engine to compact asphalt mixtures in a gyratory compactor, where angular aggregate particles were simulated using triangular face tessellations that were more realistic representations of an aggregate shape and angularity. This computational approach uses digitized form of ...
Effects of coarse aggregate angularity on the ...
performance of the asphalt mix. These criteria included coarse aggregate angularity, uncompacted voids in fine aggregate or fine aggregate angularity (FAA), flat and elongated particles, clay content, and gradation parameters. The recommended limits set by SHRP on these aggregate criteria were
particularly for aggregate angularity requirements and test methods to characterize local aggregate angularity. 17. Key Words Aggregate Angularity, Asphalt Mixture, Pavement, Performance, Finite Element Modeling 18. Distribution Statement 19. Security Classification (of this report) Unclassified 20. Security Classification (of this page ...
Angularity and surface texture of aggregate particles are important morphological characteristics and have great influences on the performance of asphalt mix. Several approaches have been developed to characterize the angularity and surface texture of aggregate particles in the past decade.
Effects of Fine Aggregate Angularity on VMA and Rutting of Kansas HMA Mixtures. Development of Tentative Guidelines for the Selection of Aggregate Gradations for Hot-Mix Asphalt. Image Analysis Techniques to Determine Fine Aggregate Angularity. Fine Aggregate Angularity: Conventional and Unconventional Approach
Jurnal Full paper Teknologi Aggregate Angularity Effect on Porous Asphalt Engineering Properties and Performance Nadhir Ahmad Tarmuzia, Ramadhansyah Putra Jayaa*, Haryati Yaacob a, Norhidayah Abdul Hassana, Md. Maniruzzaman A. Azizb a Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor Malaysia …
The four Superpave consensus aggregate properties are coarse aggregate angularity (CAA), ï¬ ne aggregate angularity (FAA), clay content, and ï¬ at and elongated particles. The expert panel identiï¬ ed several other aggregate properties as important to HMA pavement performance, but could not reach agreement on the speciï¬ cation limits.
In this paper, to ensure the overall durability of a structure, the effective asphalt film thickness and coarse aggregate angularity index of the test material were measured first. The viscoelasticity of asphalt modified with rubber powder was then analyzed using a Brinell viscosity test, scanning electron microscopy (SEM), and a dynamic shear ...
west ia division of highways 2017 instruction manual asphalt plant technician
Aggregate segregation is an important factor affecting the early distress and durability of asphalt pavement. To analyze the segregation tendency of aggregates on the mesoscopic scale, first, the segregation tendency of the particle system was measured using an aggregate segregation machine and compared with that of an aggregate-asphalt system.
The Los Angeles Abrasion (LAA) Test was also conducted in this paper to investigate the influence of variations in aggregate angularity on the resistant performance of asphalt mixtures. Before and after 100, 300, 500, and 1000 rotations of LAA polishing process, 48 particles from each different size were adopted and measured using AIMS II and ...
The study on the structural characteristics of asphalt mixtures involving the microscopic scale has rarely been considered. This study investigates the effects of the angularity of coarse aggregate on the microstructure of two commonly practiced asphalt mixture gradations (AC-16 and SMA-16) based on the X-ray Computed Tomography (XCT).
(11) stated that some aggregates can be resistant to abrasion while others abrade polished grains away to expose fresh, unpolished grains to allow for higher microtexture. Macrotexture is related to the height, width, angularity, and density of macro projections from the pavement (2).
A lower coarse-aggregate angularity leads to a smaller skid resistance of the asphalt mixture. The angularity greatly influences the high-temperature and compaction performance of asphalt mixtures. Higher angularity leads to better high-temperature stability but causes difficulty in compaction. The angularity has a significant influence on the ...
