Various modes of compacting the asphalt concrete mixture can create mechanically different behaviour of the prepared specimens and can alter its sustainability.An attempt has been made in the present assessment to pre...Various modes of compacting the asphalt concrete mixture can create mechanically different behaviour of the prepared specimens and can alter its sustainability.An attempt has been made in the present assessment to prepare asphalt concrete specimens by implementation of three modes of compaction,the gyratory,the roller,and the Marshall hammer.The specimens were prepared at the target bulk density of Marshall method at optimum asphalt content.Extra specimens were prepared at 0.5%asphalt below and above the optimum.Core specimens have been obtained from the roller compacted slab samples.The specimens were tested for the Marshall stiffness,tensile,and shear strength.It was observed that at optimum asphalt content,the indirect tensile strength declines by(18.8 and 70.5)%for gyratory and roller compacted specimens respectively as compared with hammer compacted specimens.At optimum asphalt content,the shear strength declines by(70.5 and 82.2)%while Marshall stiffness declines by(10.2 and 44.8)%for hammer and roller compacted specimens as compared with that of gyratory compacted specimen.Specimens prepared by gyratory compaction are less susceptible to the change in the testing temperature as compared with other modes of compaction.It is recommended to consider the mode of compaction to suit the required design property of sustainable asphalt concrete mixture.展开更多
文摘Various modes of compacting the asphalt concrete mixture can create mechanically different behaviour of the prepared specimens and can alter its sustainability.An attempt has been made in the present assessment to prepare asphalt concrete specimens by implementation of three modes of compaction,the gyratory,the roller,and the Marshall hammer.The specimens were prepared at the target bulk density of Marshall method at optimum asphalt content.Extra specimens were prepared at 0.5%asphalt below and above the optimum.Core specimens have been obtained from the roller compacted slab samples.The specimens were tested for the Marshall stiffness,tensile,and shear strength.It was observed that at optimum asphalt content,the indirect tensile strength declines by(18.8 and 70.5)%for gyratory and roller compacted specimens respectively as compared with hammer compacted specimens.At optimum asphalt content,the shear strength declines by(70.5 and 82.2)%while Marshall stiffness declines by(10.2 and 44.8)%for hammer and roller compacted specimens as compared with that of gyratory compacted specimen.Specimens prepared by gyratory compaction are less susceptible to the change in the testing temperature as compared with other modes of compaction.It is recommended to consider the mode of compaction to suit the required design property of sustainable asphalt concrete mixture.
