Expanded Glass Usability in Hot-Mix Asphalt as Fine Aggregate

2020 ◽  
pp. 831-838
Author(s):  
Sebnem Karahancer ◽  
Nihat Morova ◽  
Ekinhan Eriskin ◽  
Kemal Armagan ◽  
Gizem Kacaroglu ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Fine Aggregate

Durability and Mechanical Properties of Self-Compacting Concrete Incorporating Recovered Filler from Hot Mix Asphalt Plants and Recycled Fine Aggregate

2021 ◽  
Vol 894 ◽  
pp. 95-101
Author(s):  
Sepehr Ghafari ◽  
Fereidoon Moghadas Nejad ◽  
Ofelia Corbu
Keyword(s):  
Compressive Strength ◽  
Hot Mix Asphalt ◽  
Mechanical Performance ◽  
Fine Fraction ◽  
Production Plant ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Limestone Filler ◽  
Recycled Fine Aggregate ◽  
Maximum Particle

In this research, a sustainable approach is followed to develop efficient mixtures incorporating recycled fine aggregate (RFA) remained from structure demolition as well as limestone filler (LF) from production of hot mix asphalt (HMA). The LF is a byproduct of the drying process in HMA production plant which is not entirely consumed in the production of the HMA and must be hauled and disposed in landfills. The maximum particle size of the LF is approximately 40 µm. Self-Compacting Concrete (SCC) mixtures were designed replacing 5% and 10% of the cement with LF. Incorporation of 50%, and 100% RFA with the fines in the mixtures were considered with and without addition of the LF. Due to the formwork and prefabrication restrictions, the paste volume and the high range water reducer content were tuned in such a way that the slump flow of the mixtures remained between 660 mm to 700 mm without segregation. Durability and mechanical performance of the mixtures were evaluated by resistance against freeze-thaw scaling exposed to deicing agents and compressive strength. It was observed that the SCC mixtures containing 10% LF outperformed those without the use of LF while 5% SCC mixtures did not exhibit tangible superiority. Incorporation of RFA as the fine fraction degraded the durability of all the mixtures. While replacing all the fine fraction with RFA significantly impaired durability and compressive strength, 50% RF mixtures could be designed containing 10% LF that remained in the allowable limits.

Use of Screenings to Produce Hot-Mix Asphalt Mixtures

2003 ◽  
Vol 1832 (1) ◽  
pp. 59-66 ◽  
Author(s):  
L. Allen Cooley ◽  
Jingna Zhang ◽  
Michael H. Huner ◽  
E. Ray Brown
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Binder ◽  
Cellulose Fiber ◽  
Fine Aggregate ◽  
Structural Improvement ◽  
Maintenance And Rehabilitation ◽  
Modified Asphalt Binder ◽  
Maximum Particle ◽  
Air Void ◽  
Different Sources

Thin-lift hot-mix asphalt (HMA) layers are utilized in almost every maintenance and rehabilitation application. These mix types require smaller maximum particle sizes than do most conventional HMA surface layers. Although the primary functions of thin-lift HMA are to level the pavement surface, smooth the surface, or slow the deterioration of the existing pavement, or all three, these mixes may also provide some structural improvement, depending on the layer thickness placed. The use of manufactured aggregate screenings (fine aggregate stockpiles) as the sole aggregate portion of an HMA mixture was evaluated in this study. Mixes of this nature have the potential for use as thin-lift HMA layers. Two different sources of aggregate screenings, granite and limestone, were utilized to design mixtures at varying design air void contents and then tested for rut susceptibility. The use of a neat versus a modified asphalt binder was also evaluated, as well as the potential advantages of cellulose fiber additives. These mixtures using 100% manufactured screenings proved to be acceptable with regard to rutting resistance. No work was performed in this study to examine thermal cracking or durability.

Evaluation of Steel Slag Fine Aggregate in Hot-Mix Asphalt Mixtures

1997 ◽  
Vol 1583 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Prithvi S. Kandhal ◽  
Gary L. Hoffman
Keyword(s):  
Hot Mix Asphalt ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Hot Water ◽  
Test Method ◽  
Fine Aggregate ◽  
Limestone Aggregate ◽  
Aggregate Fraction ◽  
Water Conditioning ◽  
Test Criteria

Since a considerable amount of steel slag is produced in the southwestern part of Pennsylvania around Pittsburgh, where natural fine aggregate sources are limited, an evaluation was undertaken to determine the feasibility of using “cured” steel slag fine aggregate in hot-mix asphalt (HMA) mixtures. The objectives of this work were to (1) correlate fine aggregate expansions to the “parent” coarse aggregate expansions, (2) determine properties of dense-graded Pennsylvania ID-2 wearing coarse mixtures made with various sources of steel slag and crushed limestone fine aggregate, and (3) recommend appropriate specifications and test criteria for implementing the use of steel slag fine aggregate, if justifiable. Expansive characteristics of the steel slag aggregates were determined by Pennsylvania Test Method 130. HMA mixtures made with steel slag aggregates and limestone aggregate (control) were subjected to hot-water conditioning and Lottman freeze-and-thaw conditioning to determine potential problems, such as swell and moisture-induced damage. An excellent correlation existed between the average total expansion of the fine aggregate fraction and that of the “parent” coarse aggregate. No significant problems with swell and moisture-induced damage were noted in HMA mixtures containing steel slag fine aggregate and limestone coarse aggregate. Specifications and test criteria were recommended for the use of steel slag fine aggregate in HMA mixtures.

Laboratory evaluation of seashells used as fine aggregate in hot mix asphalt

2018 ◽  
Vol 21 (5) ◽  
pp. 620-628 ◽  
Author(s):  
Gaby Ruiz ◽  
Francisco Chávez ◽  
Stephanie Santamaría ◽  
William Araujo ◽  
Jorge Timaná ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Laboratory Evaluation ◽  
Fine Aggregate

Influence of Reclaimed Asphalt Pavement on Performance-Related Properties of Gap-Graded Rubberized Hot-Mix Asphalt

2017 ◽  
Vol 2633 (1) ◽  
pp. 80-89 ◽  
Author(s):  
Shawn S. Hung ◽  
Mohammad Zia Alavi ◽  
David Jones ◽  
John T. Harvey
Keyword(s):  
Performance Test ◽  
Hot Mix Asphalt ◽  
Asphalt Pavement ◽  
Environmental Benefits ◽  
Reclaimed Asphalt Pavement ◽  
Fine Aggregate ◽  
Reflective Cracking ◽  
Cracking Resistance ◽  
California Department ◽  
Reclaimed Asphalt

Rubberized hot-mix asphalt (RHMA) has been widely used in construction projects by the California Department of Transportation (Caltrans) for the environmental benefits of its recycled waste tires and for its improved fatigue and reflective cracking resistance. Currently, Caltrans does not permit the use of reclaimed asphalt pavement (RAP) in any gap- or open-graded rubberized asphalt mixes. However, given the cost and environmental benefits of RAP to replace portions of required virgin binder and aggregates in conventional mixes, interest is growing in the addition of some RAP to RHMA mixes as well. This study investigated concerns about this proposed practice. Three phases of laboratory testing (i.e., asphalt binder testing, fine aggregate matrix mix testing, and full-graded mix testing) were conducted to evaluate the effects of the addition of RAP into new RHMA mixes. The results indicated that the gap-graded aggregate structure of RHMA might limit the amount of RAP that could be used in the mix. Only 10% RAP by binder replacement could be achieved for the mix tested in this study, but the other specified volumetric requirements were still met. Replacement of a portion of asphalt rubber binder with age-hardened RAP binder increased the binder stiffness at low and high temperatures, which indicated enhanced rutting performance but diminished low-temperature cracking performance. Test results from full-graded mixes indicated similar trends, with improved rutting performance with the addition of RAP but also with significantly poorer fatigue and reflective cracking resistance.

Influence of Aggregate Properties on Performance of Heavy-Duty Hot-Mix Asphalt Pavements

1996 ◽  
Vol 1547 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Randy C. Ahlrich
Keyword(s):  
Creep Test ◽  
Hot Mix Asphalt ◽  
Test Methods ◽  
Unit Weight ◽  
Void Content ◽  
Fine Aggregate ◽  
Heavy Duty ◽  
Coarse Aggregates ◽  
Aggregate Properties ◽  
Aggregate Particles

Because approximately 85 percent of the total volume of hot-mix asphalt (HMA) mixtures consists of aggregates, the performance of HMA mixtures is greatly affected and influenced by properties of the aggregate blend. The angularity, shape, and texture of the aggregate particles have a significant effect on the performance of HMA mixtures by controlling the mixture's strength and rutting resistance. Rough, angular aggregates have been proved to produce higher-quality HMA pavements than smooth, round aggregates. Current aggregate tests are primarily based on experience and empirical characterization tests. A study was conducted to evaluate test methods that could be used to characterize aggregate properties that are related to HMA rutting potential of heavy-duty pavements. Specifically, FAA aggregate properties and aircraft loading conditions were addressed. The aggregate particles were characterized with the particle index (ASTM D3398), uncompacted void content for fine aggregate (ASTM C1252), modified ASTM C1252 for coarse aggregate, and unit weight and voids in aggregate (ASTM C29). The HMA mixtures were evaluated for rutting potential using the confined repeated load deformation (dynamic creep) test. The laboratory investigation indicated that the tests for particle index, uncom-pacted void content for fine and coarse aggregates, and unit weight and voids in aggregate could be used to characterize the shape and texture of aggregate particles. The study also indicated that the confined creep test could differentiate between HMA mixtures with different aggregate properties in terms of their rutting potential.

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