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Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties./
Author:	Roohi Sefidmazgi, Nima.
Description:	1 online resource (210 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Contained By:	Dissertation Abstracts International75-05B(E).
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781303701474

Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties.
Roohi Sefidmazgi, Nima.

Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties. - 1 online resource (210 pages)

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

The first part of this dissertation is focused on comparing the mechanisms and fundamental properties that control the performance of asphalt mixtures during the uniaxial flow number testing. It is shown that aggregate packing, as measured using an image analysis method, is the key property affecting the failure and deformation characteristics in uniaxial testing. Additionally, it is shown that the main cause of tertiary flow of mixtures in the flow number test is structural instability and bulging (dilation) of aggregate skeleton. It is observed that dense graded mixtures with better aggregate packing showed a better rutting performance due to two principal mechanisms: first, lower stress level within the binder phase during loading due to aggregate skeleton serving as the main stress path, and second, the aggregates in proximity or contact showed a supporting structure (higher aggregate particle stability), which delays the tertiary flow in material, and reduces the rate of permanent deformation. The second part of this dissertation is focused on the mechanisms and factors controlling aggregate mobility and structure formation during compaction and their application for optimization of the construction process and for the development of a performance based mix design methodology. It is shown that for sufficient packing of aggregates during compaction, the viscosity of mastic should be low enough for lubrication, but high enough to prevent dry contacts of aggregates before the required aggregate packing is obtained. Depending on the stress state at the proximity zone of aggregates, there is a minimum mastic viscosity that is required to provide sufficient film thickness to prevent locking of the mixture at the early stage of compaction. A set of recommendations are proposed to estimate the optimum conditions for effective packing of aggregates. Based on the recommendations it is shown that packing of mixtures (as measured by total proximity zone length between aggregates) is a function of mastic viscosity, aggregate gradation, and compaction effort. The levels of these factors can be selected in order to achieve the required packing characteristic that is suitable for the design traffic loading.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781303701474Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties.
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100 1 $a Roohi Sefidmazgi, Nima. $3 1184230
245 1 0 $a Hot Mix Asphalt Design to Optimize Construction and Rutting Performance Properties.
264 0 $c 2014
300 $a 1 online resource (210 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Adviser: Hussain U. Bahia.
502 $a Thesis (Ph.D.) $c The University of Wisconsin - Madison $d 2014.
504 $a Includes bibliographical references
520 $a The first part of this dissertation is focused on comparing the mechanisms and fundamental properties that control the performance of asphalt mixtures during the uniaxial flow number testing. It is shown that aggregate packing, as measured using an image analysis method, is the key property affecting the failure and deformation characteristics in uniaxial testing. Additionally, it is shown that the main cause of tertiary flow of mixtures in the flow number test is structural instability and bulging (dilation) of aggregate skeleton. It is observed that dense graded mixtures with better aggregate packing showed a better rutting performance due to two principal mechanisms: first, lower stress level within the binder phase during loading due to aggregate skeleton serving as the main stress path, and second, the aggregates in proximity or contact showed a supporting structure (higher aggregate particle stability), which delays the tertiary flow in material, and reduces the rate of permanent deformation. The second part of this dissertation is focused on the mechanisms and factors controlling aggregate mobility and structure formation during compaction and their application for optimization of the construction process and for the development of a performance based mix design methodology. It is shown that for sufficient packing of aggregates during compaction, the viscosity of mastic should be low enough for lubrication, but high enough to prevent dry contacts of aggregates before the required aggregate packing is obtained. Depending on the stress state at the proximity zone of aggregates, there is a minimum mastic viscosity that is required to provide sufficient film thickness to prevent locking of the mixture at the early stage of compaction. A set of recommendations are proposed to estimate the optimum conditions for effective packing of aggregates. Based on the recommendations it is shown that packing of mixtures (as measured by total proximity zone length between aggregates) is a function of mastic viscosity, aggregate gradation, and compaction effort. The levels of these factors can be selected in order to achieve the required packing characteristic that is suitable for the design traffic loading.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
650 4 $a Mechanical engineering. $3 557493
655 7 $a Electronic books. $2 local $3 554714
690 $a 0543
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Wisconsin - Madison. $b Civil & Environmental Engr. $3 1182853
773 0 $t Dissertation Abstracts International $g 75-05B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3610398 $z click for full text (PQDT)