"As a possible solution for the rapidly proliferating problem of waste glass disposal in the United States, glass is being considered for use as aggregate in bituminous concrete mixtures. Crushed waste glass particles, and crushed bottle glass particles in particular, are more angular, much smoother, and contain a higher percentage of flat and/or elongated particles than .
Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate ASTM D4791.*Scope*This test method covers the determination of the ...
Evaluation of the specifiion for flat and elongated particles for use in hot mix asphalt in Connecticut.
specifiion of flat and elongated particles [randpic] Evaluation of the Specifiion for Flat and Elongated a maximum acceptable percentage of flat and elongated particles that a coarse aggregate blend may have before being ruled out as an .
FLAT AND ELONGATED PARTICLES Background The asphalt industry believes excessive flat and elongated particles (FE) to be undesirable. Perfectly cubical aggre gates may also be undesirable. Prior to the implementation of the Superpave method, several design procedures had speci fiions limiting the percent of FE allowed in the mix.
Flat and Elongated Particles. ASTM D4791. Combined six 20lb canvas bags (See Note 3) or. Batch 30 lb (proportioned per bin percentages) HMA plant or before lime treatment. 1 for each 750 tons, 1 per day minimum. For the SPF process, see Note 17. Production startup evaluation, and minimum 1 random for every 50,000 tons or less of paving
Standard test method for flat particles, elongated particles, or flat and elongated particles in coarse aggregate, ASTM Designation 479189, 1995, 3 pp. Show more Advertisement
Jul 18, 2019 · The objective of this study was to investigate three flat and elongated particles ratios (FERs): 2:1, 3:1, and 5:1 using a modern 3D laser scanning technique and compare results with ASTM D 4791. Based on the ASTM D4791, the Superpave specifiion allows for a maximum of 10% coarse aggregates to have FER of 5:1 in asphalt mixes.
FLAT AND ELONGATED AGGREGATES IN SUPERPAVE REGIME. Some states have recommended changing the definition of flat and elongated aggregates from 5:1 to 3:1 and an increase in the maximum allowable percentage of flat and elongated (FE) particles to 20% or higher in the Superpave aggregate specifiion.
Before the specifiion is changed to a 3:1 ratio the effect of the particle shape on performance should be evaluated. Two aggregates (limestone and granite) were evaluated in their "asreceived" state and in two other particle shapes (more cubical, less flat and .
A new imageanalysis approach determines the percentage by weight of the flat and elongated particles providing results comparable to the manual results from ASTM D4791 by presenting the results ...
This test method covers the determination of the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates. Two procedures, Method A and Method B, are presented in this standard. Method A is a reflection of the original procedure as developed prior to Superpave and is intended for all nonSuperpave appliions.
Jul 30, 2020 · Generally, flat and elongated aggregate particles are avoided or are limited to about 15 % by weight of the total aggregate. Recommended Values of Flakiness Index and Elongation Index The aggregate shape tests give only a rough idea of the relative shapes of aggregates.
Flat and elongated particles have long been considered undesirable in hot mix asphalt (HMA) mixes due to their tendency to break down during construction and traffic. Currently, the Superpave mix design system currently specifies a maximum limit of 10 percent of flat and elongated particles at the 5:1 ratio for the design aggregate blend.
Flakiness Full | Construction Aggregate | Concrete. The flakiness index of an aggregate sample is found by separating the flaky particles and expressing their mass as a percentage of the mass of the sample tested. lower the percentages of both flat and elongated pieces and may be accompanied by a decrease on production OBJECTIVE To determine the flakiness .
Apr 07, 2013 · Flaky particles. The particles whose least dimension is less than times the mean size dimensions. Elongated particles. The particles whose greatest dimension is greater than times the mean size dimension. Mean size of aggregates. Mean size of aggregates is defined as the mean of two seive sizes, between which the particle is retained.
The flat and elongated particle test is used to determine the dimensional ratios for aggregate particles of specific sieve sizes. This characterization is used in the Superpave specifiion to identify aggregate that may have a tendency to impede compaction or have difficulty meeting VMA specifiions due to aggregate degradation.
This test method covers the determination of the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates. Two procedures, Method A and Method B, are presented in this standard. Method A is a reflection of the original procedure as developed prior to Superpave and is intended for all nonSuperpave appliions.
Mar 29, 2020 · Generally, flat and elongated aggregate particles are avoided or are limited to about 15 % by weight of the total aggregate. Recommended Values of Flakiness Index and Elongation Index The aggregate shape tests give only .