M.Sc. Tezi Görüntüleme

Student: Celaleddin Ensar ŞENGÜL
Supervisor: Yrd. Doç. Dr. Atakan AKSOY
Department: Civil Engineering
Institution: Graduate School of Natural and Applied Sciences
University: Karadeniz Technical University, Turkey
Level: M.Sc.
Acceptance Date: 26/7/2006
Number of Pages: 93
Registration Number: i1723

      In this thesis hydrated lime (HL) modified asphalt mixtures were utilized with

repeated creep tests (RCT) and Marshall Quotient (MQ) approaches. Filler aggregate was

      reduced and HL was substituted as 2, 4, and 6 percents. HL was directly incorporated to

the granule aggregate blending. 48 identical samples at the optimum asphalt cement (AC)

      content were produced and half of these samples were conditioned with designing damage

conditioning system based on repeated moisture damage.

      HL was found as an active filler material and might be used as modifier. MQ was

pleaded to evaluate rutting problem. Therefore permanent deformation evaluation must be

      comprised with other promising methods such as repeated creep or wheel tracking tests at

high temperatures. In passive state or else unconditional mixtures lower MQ were obtained

      from the lime modified mixtures than the conventional mixtures. Unlike this higher MQ

were found with modified mixtures in conditional mixtures.

      HL efficiency may be observed with the determining environmental conditioning

system (ECS). Designed ECS can be constituted a mechanical hazardous changing in terms

      of expecting. In RCT all conditional mixtures reflect lower resistance to rutting progress

according to own unconditional ones. With the increasing of HL content rutting resistance

      has increased for conditional mixtures. Confirmation results were obtained with the MQ

concept and RCT for conditional mixtures especially 4 and 6 percents HL contents. RCT

      for produced cylindrically compacted identical samples were quite effective for evaluating

lime efficiency for selected grain size distribution. Damage mechanism was based on the

      moisture damage and it is thought that HL modification was found beneficial in view of

water sensitivity with related to moisture damage-rutting interaction hypothesis? Rutting

      may be evaluated with RCT at high temperature conditions for lime modified mixtures in a

certain way.

      Key words: Permanent deformation, Marshall quotient, repeated creep, hydrated lime,

asphalt mixtures