TY - GEN
T1 - Laboratory investigation of asphalt pavements with low density and recommendations to prevent density deficiency
AU - Zeinali, Alireza
AU - Blankenship, Phillip B.
AU - Anderson, R. Michael
AU - Mahboub, Kamyar C.
PY - 2013
Y1 - 2013
N2 - In most USA asphalt construction projects the goal of compacting a hot-mix asphalt (HMA) layer is to achieve the optimum density which is 92% of the maximum specific gravity (Gmm) of the asphalt mixture. However, this level of density is not always achieved. This paper evaluates the effect of field compaction deficiencies on the HMA durability through laboratory testing. HMA samples were collected from construction sites in the United States. A series of laboratory tests were conducted to compare the performance of HMA mixtures at their actual in-place density as well as the desired density of 92% of Gmm. The statistical analysis on the results showed that the performance of the pavements could significantly improve by eliminating the deficiencies in their in-place densities. Moreover, the compactibility of the mixtures was investigated using the compaction data from the Superpave gyratory compactor. Compaction characteristics of the mixtures were compared to a control mixture, and the results showed that the shortage in the binder content of the mixtures could be a major factor which may have caused the density deficiencies. Furthermore, the effect of higher-than-optimum binder content was evaluated on the compactibility of the control mixture.
AB - In most USA asphalt construction projects the goal of compacting a hot-mix asphalt (HMA) layer is to achieve the optimum density which is 92% of the maximum specific gravity (Gmm) of the asphalt mixture. However, this level of density is not always achieved. This paper evaluates the effect of field compaction deficiencies on the HMA durability through laboratory testing. HMA samples were collected from construction sites in the United States. A series of laboratory tests were conducted to compare the performance of HMA mixtures at their actual in-place density as well as the desired density of 92% of Gmm. The statistical analysis on the results showed that the performance of the pavements could significantly improve by eliminating the deficiencies in their in-place densities. Moreover, the compactibility of the mixtures was investigated using the compaction data from the Superpave gyratory compactor. Compaction characteristics of the mixtures were compared to a control mixture, and the results showed that the shortage in the binder content of the mixtures could be a major factor which may have caused the density deficiencies. Furthermore, the effect of higher-than-optimum binder content was evaluated on the compactibility of the control mixture.
KW - Air void content
KW - Compactibility
KW - Fatigue
KW - Hot-mix asphalt
KW - In-place density
KW - Pavement materials
KW - Performance test
KW - Rutting
KW - Superpave gyratory compactor
UR - http://www.scopus.com/inward/record.url?scp=84884773833&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884773833&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.723.128
DO - 10.4028/www.scientific.net/AMR.723.128
M3 - Conference contribution
AN - SCOPUS:84884773833
SN - 9783037857403
T3 - Advanced Materials Research
SP - 128
EP - 135
BT - Innovation and Sustainable Technology in Road and Airfield Pavement
T2 - 8th International Conference on Road and Airfield Pavement Technology, ICPT 2013
Y2 - 14 July 2013 through 18 July 2013
ER -