Permanent deformation characteristics of modified thin overlay bitumen mixtures comprising waste polymers

2021 ◽  
Author(s):  
Yassir Abo Almaali ◽  
Shakir Al-Busaltan
Keyword(s):  
Permanent Deformation ◽  
Deformation Characteristics

Mechanistic Evaluation of Hydrated Lime in Hot-Mix Asphalt Mixtures

2000 ◽  
Vol 1723 (1) ◽  
pp. 26-36 ◽  
Author(s):  
Louay N. Mohammad ◽  
Chris Abadie ◽  
Rana Gokmen ◽  
Anand J. Puppala
Keyword(s):  
Resilient Modulus ◽  
Permanent Deformation ◽  
Hydrated Lime ◽  
Engineering Properties ◽  
Deformation Characteristics ◽  
Asphaltic Concrete ◽  
Moisture Susceptibility ◽  
Limestone Aggregate ◽  
Concrete Mixtures ◽  
Mineral Fillers

Permanent deformation and moisture damage are common distresses found in pavements today. The use of mineral fillers such as hydrated lime is known to provide a decrease in moisture susceptibility. In many cases, mineral fillers will also increase the mixture stiffness. Conventional asphaltic concrete mixtures and mixtures modified with hydrated lime were evaluated for their fundamental engineering properties as defined by indirect tensile strength and strain, permanent deformation characteristics, resilient modulus, and fatigue resistance. A typical Louisiana low-volume dense-graded mixture was used. The test factorial included two aggregate types (limestone and gravel) and two asphalt cement types (a conventional AC-30 and one modified with styrene-butadiene polymer). The results indicated that the addition of hydrated lime as mineral filler improved the permanent deformation characteristics and fatigue endurance of the asphaltic concrete mixtures. This improvement was particularly apparent at higher testing temperatures with mixes containing polymer-modified asphalt and limestone aggregate.

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