Experimental Investigation into the Impact of Compaction Energy Level on Thickness of Flexible Pavement
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TECHNICAL NOTE
Experimental Investigation into the Impact of Compaction Energy Level on Thickness of Flexible Pavement Mehmet Tahir Deniz1 • Abdullah Hilmi Lav2 • Abdulgazi Gedik3 Received: 18 February 2020 / Revised: 12 September 2020 / Accepted: 24 September 2020 Iran University of Science and Technology 2020
Abstract As a means of gaining a better understanding of the impact of compaction energy levels on the thickness of flexible pavements, this study investigated samples that were 50% thicker than the standard Marshall specimen sizes. The gradations for those longer (thicker) specimens were based on the binder course gradations as specified by the Republic of Turkey’s General Directorate of Highways. To obtain reliable assessments of the thicker specimens, we compared our test results with those of a control group consisting of standard Marshall Briquettes prepared using the same materials. All specimens were compacted with 10 different compaction energy levels that were increased by fives, starting from 50 blows and ending at 95 blows. After determining their lengths, volumes and specific gravities, a special marble cutter was used to split the thick specimens into two equal parts. Those two identical specimens were identified as the ‘‘thin specimens’’. Subsequently, the Marshall stability test and the indirect tensile test were applied both to the standard Marshall specimen group and the thick and the thin specimen groups. The test results showed that asphalt specimens of 47 and 95 mm in height were optimally compacted after being subjected to 65 and 70 blows. Keywords Asphalt Thick specimen Thin specimen Compaction energy Marshall stability
1 Introduction Asphalt mixes composed of aggregate and binder are used in the construction of upper road layers. The coarse aggregate, fine aggregate and mineral filler used in these layers must be optimally proportioned if relevant specifications and standards requirements are to be satisfied. Pavement engineers have put considerable effort into finding ways to enhance asphalt performance, increase & Abdulgazi Gedik [email protected] Mehmet Tahir Deniz [email protected] Abdullah Hilmi Lav [email protected] 1
Faculty of Engineering and Architecture, Department of Civil Engineering, Beykent University, Istanbul, Turkey
2
Faculty of Civil Engineering, Istanbul Technical University, Istanbul 34469, Turkey
3
Transportation Engineering, Faculty of Civil Engineering, Istanbul Technical University, Istanbul 34469, Turkey
sustainability in pavement construction, preserve natural resources and protect the environment [1, 2]. The design of asphaltic paving mixture is largely a key matter of selecting and proportioning convenient materials to obtain the desired properties for a sustainable road pavement. The thickness and type of each pavement layer should be determined prior to pavement design. The design of bituminous mixture with satisfactory performance is vital to guarantee the expected lifespan of asphalt pav
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