Correct compaction is vital for asphalt mixture service life. An adequately compacted mixture with inferior properties can achieve better performance than a mixture with excellent properties but poorly compacted. This study investigated resistance to damage caused by over-compaction by utilizing the locking point concept. Over-compaction might cause damage to the aggregate structure and decrease service life. The locking point is defined as the moment during mixture compaction at which an aggregate skeleton is developed and becomes stable. Beyond the locking point, more compaction energy does not significantly increase mixture density and can damage aggregate particles. A total of 15 mixtures was utilized and evaluated using the gyratory compactor. Among them, five dense-graded plant mixtures contained different aggregates and binders, and 10 laboratory mixtures (three types: the surface, the base, and stone mastic asphalt [SMA]) were designed with the most popular coarse aggregates in Tennessee: hard limestone, soft limestone, gravel, and granite. The results of this study show that the highest locking point was reached by the mixtures containing gravel. The SMA mixtures have, on average, lower locking points than the dense-graded mixtures. Most of the dense-graded mixtures made with crushed stones failed in the range of +20 to +30 gyrations, whereas the samples made with gravels failed in the range of +30 to +40 gyrations, indicating that gravel seems to be the most resistant to damage.
RobertsF.KandhalP.BrownE.LeeD.KennedyT.Hot Mix Asphalt Materials, Mixture Design, and Construction. National Asphalt Pavement Association Research and Education Foundation, Lanham, MD, 1991.
2.
PolaczykP.HuangB.ShuX.GongH.Investigation into Locking Point of Asphalt Mixtures Utilizing Superpave and Marshall Compactors. Journal of Materials in Civil Engineering, Vol. 31, No. 9, 2019, p. 04019188 https://doi.org/10.1061/(ASCE)MT.1943-5533.0002839.
3.
BonnotJ.Selection and Use of the Procedures for Laboratory Compaction of Bituminous Mixtures. In Proc., Workshop. Performance Related Test Procedures for Bituminous Mixtures, Boole Press, Dublin, Ireland, 1997. pp. 52–73.
4.
VavrikW.Asphalt Mixture Design Concepts to Develop Aggregate Interlock. PhD thesis. University of Illinois at Urbana-Champaign, 2000.
5.
JiaX.HuW.PolaczykP.GongH.HuangB.Comparative Evaluation of Compacting Process for Base Materials Using Lab Compaction Methods. Transportation Research Record: Journal of the Transportation Research Board. 2019. 2673(4): 558–567. https://doi.org/10.1177/0361198119837953.
6.
PolaczykP.ShuX.GongH.HuangB.Influence of Aggregates Angularity on the Locking Point of Asphalt Mixtures. Road Materials and Pavement Design, Vol. 20, Supplement 1, 2019, pp. S183–S195. https://doi.org/10.1080/14680629.2019.1588151.
7.
GongH.SunY.HuW.PolaczykP. A.HuangB.Investigating Impacts of Asphalt Mixture Properties on Pavement Performance Using LTPP Data through Random Forests. Construction and Building Materials, Vol. 204, 2019, pp. 203–212. https://doi.org/10.1016/j.conbuildmat.2019.01.198.
8.
BahiaH.FriemelT.PetersonP.RusselJ.PoehneltB.Optimization of Constructability and Resistance to Traffic: A New Design Approach for HMA Using the Superpave Compactor. Asphalt Paving Technology. Journal of the Association of Asphalt Paving Technologists, Vol. 67, 1998, pp. 189–232.
9.
MohammadL.ShamsiK.A Look at the Bailey Method and Locking Point Concept in Superpave Mixture Design. Transportation Research Circular E-C124: Practical Approaches to Hot-Mix Asphalt Mix Design and Production Quality Control Testing. Transportation Research Board, Washington, D.C., 2007, pp. 12–32.
10.
BrownE. R.McRaeJ. L.CrawleyA. B.Effect of Aggregates on Performance of Bituminous Concrete. In Implication of Aggregates in the Design, Construction, and Performance of Flexible Pavements (SchreudersH.MarekC., eds), ASTM International, West Conshohocken, PA, 1989, pp. 34–63.
11.
MallickR.Use of Superpave Gyratory Compactor to Characterize Hot-Mixture Asphalt. Transportation Research Record: Journal of the Transportation Research Board, 1999. 1681: 86–96.
12.
AndersonR. M.TurnerP. A.PetersonR. L.NCHRP Report 478: Relationship of Superpave Gyratory Compaction Properties to HMA Rutting Behavior. TRB, National Research Council, Washington, D.C., 2002.
13.
LeivaF.WestR.Analysis of Hot-Mix Asphalt Lab Compactability Using Lab Compaction Parameters and Mix Characteristics. Transportation Research Record: Journal of the Transportation Research Board, 2008. 2057: 89–98.
14.
VavrikW.CarpenterS.Calculating Air Voids at Specified Number of Gyrations in Superpave Gyratory Compactor. Transportation Research Record: Journal of the Transportation Research Board, 1998. 1630: 117–125.
15.
MasadE.MuhunthanB.ShashidharN.HarmanT.Quantifying Laboratory Compaction Effects on the Internal Structure of Asphalt Concrete. Transportation Research Record: Journal of the Transportation Research Board, 1999. 1681: 179–185.
16.
PolaczykP.HanB.HuangB.JiaX.ShuX.Evaluation of the Hot Mix Asphalt Compactability Utilizing the Impact Compaction Method. Construction and Building Materials, Vol. 187, 2018, pp. 131–137. https://doi.org/10.1016/j.conbuildmat.2018.07.117.
17.
LindenR.MahoneyJ.JacksonN.Effect of Compaction on Asphalt Concrete Performance, Transportation Research Record: Journal of the Transportation Research Board, 1989. 1217: 20–28.
18.
CaiX.WuK. H.HuangW. K.WanC.Study on the Correlation between Aggregate Skeleton Characteristics and Rutting Performance of Asphalt Mixture. Construction and Building Materials, Vol. 179, 2018, pp. 294–301.
19.
CaiX.WangD.Evaluation of Rutting Performance of Asphalt Mixture Based on the Granular Media Theory and Aggregate Contact Characteristics. Road Materials and Pavement Design, Vol. 14, No. 2, 2013, pp. 325–340.
20.
ZulkatiA.WongY. D.SunD. D.Mechanistic Performance of Asphalt-Concrete Mixture Incorporating Coarse Recycled Concrete Aggregate. Journal of Materials in Civil Engineering, Vol. 25, No. 9, 2013, pp. 1299–1305.
21.
KusumawardaniD. M.WongY. D.The Influence of Aggregate Shape Properties on Aggregate Packing in Porous Asphalt Mixture (PAM). Construction and Building Materials, Vol. 255, 2020, p. 119379.
22.
ChengY.QinY.Aggregates Breakage Introduction to Optimize Gradation of Multi-Supporting Skeleton Asphalt Mixtures. Construction and Building Materials, Vol. 200, 2019, pp. 265–271.
23.
SefidmazgiN.TeymourpourP.BahiaH.Effect of Particle Mobility on Aggregate Structure Formation in Asphalt Mixtures. Road Materials and Pavement Design, Vol. 14, Supplement 2, 2013, pp. 16–34.
FullertonD.BushC.PennellJ.Map of Surficial Deposits and Materials in the Eastern and Central United States (East of 102° West Longitude). U.S.Geological Survey, 2003.
26.
ASTM C127. Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate. American Society for Testing and Materials, West Conshohocken, PA, 2015.
27.
ASTM C128. Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate. American Society for Testing and Materials, West Conshohocken, PA, 2015.
28.
ASTM D 2726. Standard Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Asphalt Mixtures. American Society for Testing and Materials, West Conshohocken, PA, 2017.
29.
ASTM D 2041. Standard Test Method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures. American Society for Testing and Materials, West Conshohocken, PA, 2011.
30.
AASHTO T164. Standard Method of Test for Quantitative Extraction of Asphalt Binder from Hot Mix Asphalt (HMA). American Association of State Highway and Transportation Officials, Washington, D. C., 2014.
