Path: TopS2-ThesesHighway Systems and Engineering1998

Characteristics of asphalt concrete wearing course mix at different compaction levels.

Master Theses from JBPTITBPP / 2007-04-16 12:32:40
Oleh : W.Bonatua Lubis, S2 - Highway Systems Engineering
Dibuat : 1998-00, dengan file

Keyword : Asphalt concrete; Composition properties; Mechanical properties

This thesis describes a laboratory investigation of the influence of compaction level on the composition and mechanical properties of an asphalt concrete wearing course mix. Marshall specimens of the mix were compacted by applying 25, 35, 50, 75 and 100 blows to each face of the specimen and optimum bitumen content was determined for each compaction level. Specimens prepared at optimum bitumen content were investigated further in the Marshall immersion test, the wheel tracking test and the indirect tensile modulus test. Optimum bitumen content was found to reduce with increase in compaction level. At optimum bitumen content, density increased and void in the mineral aggregate (VMA) and voids filled with bitumen (VFB) reduced as the compaction level was increased; voids in the mix (VIM) ranged from 4.5 to 3.75 % as compaction level increased from 25 to 100 blows. Stability at optimum bitumen content increased significantly with increase in compaction level but at all compaction levels was considerably higher than the minimum recommended by SNI. Flow values were generally low and this, combined with high stability values, resulted in Marshall quotient values that exceeded the maximum specified by SNI. In the Marshall immersion test, all specimens that prepared at optimum bitumen content for each compaction level were satisfied the SNI criterion on retained stability and there were increased with increased compaction effort. In the wheel tracking test rate, of deformation (mm/min.) reduced, dynamic stability (pass./mm) increased and permanent deformation after 2640 wheel passes reduced as compaction level increased. Indirect tensile modulus test were performed at 25 degree C and 35 degree C. At both temperatures, there was a significant increase in modulus (38 % at 25 degree C and 46 % at 35 degree C) when compaction level was raised from 25 blows to 35 blows.
Further increase in compaction level resulted in a more modest increase in modulus; modulus at 25 degree C increased by 9 % when compaction level was increased from 35 to 75 blows, the corresponding increase at 35 degree C was 23 %.

Deskripsi Alternatif :

This thesis describes a laboratory investigation of the influence of compaction level on the composition and mechanical properties of an asphalt concrete wearing course mix. Marshall specimens of the mix were compacted by applying 25, 35, 50, 75 and 100 blows to each face of the specimen and optimum bitumen content was determined for each compaction level. Specimens prepared at optimum bitumen content were investigated further in the Marshall immersion test, the wheel tracking test and the indirect tensile modulus test. Optimum bitumen content was found to reduce with increase in compaction level. At optimum bitumen content, density increased and void in the mineral aggregate (VMA) and voids filled with bitumen (VFB) reduced as the compaction level was increased; voids in the mix (VIM) ranged from 4.5 to 3.75 % as compaction level increased from 25 to 100 blows. Stability at optimum bitumen content increased significantly with increase in compaction level but at all compaction levels was considerably higher than the minimum recommended by SNI. Flow values were generally low and this, combined with high stability values, resulted in Marshall quotient values that exceeded the maximum specified by SNI. In the Marshall immersion test, all specimens that prepared at optimum bitumen content for each compaction level were satisfied the SNI criterion on retained stability and there were increased with increased compaction effort. In the wheel tracking test rate, of deformation (mm/min.) reduced, dynamic stability (pass./mm) increased and permanent deformation after 2640 wheel passes reduced as compaction level increased. Indirect tensile modulus test were performed at 25 degree C and 35 degree C. At both temperatures, there was a significant increase in modulus (38 % at 25 degree C and 46 % at 35 degree C) when compaction level was raised from 25 blows to 35 blows.
Further increase in compaction level resulted in a more modest increase in modulus; modulus at 25 degree C increased by 9 % when compaction level was increased from 35 to 75 blows, the corresponding increase at 35 degree C was 23 %.

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