Date Approved

8-5-2019

Embargo Period

8-14-2019

Document Type

Thesis

Degree Name

M.S. Civil Engineering

Department

Civil and Environmental Engineering

College

Henry M. Rowan College of Engineering

First Advisor

Mehta, Yusuf

Second Advisor

Lomboy, Gilson

Third Advisor

Cleary, Douglas

Subject(s)

Pavements, Asphalt--Recycling

Disciplines

Civil and Environmental Engineering | Materials Science and Engineering

Abstract

The objective of this research study is to present a procedure for designing Cold In-Place Recycling (CIR) mixtures through balancing cracking and rutting for these mixtures. Eight CIR mixtures were prepared using two recycling agents (foamed and emulsified asphalts), then cured for three days at two temperatures (140oF and 50oF), and compacted at two gyration levels (30 and 70 gyrations). The CIR mixtures were prepared at constant dosages of water and cement, 3% and 1%, respectively. Air void of each CIR performance test specimen was determined using the CoreLok device. The rutting susceptibility of these mixtures was then evaluated using the Asphalt Pavement Analyzer (APA) and Dynamic Complex Modulus (|E*|) while resistance to cracking was evaluated using the Indirect Tensile Strength (ITS) test and Fracture Energy was determined using the Semi-Circular Bend (SCB-FE) test. The developed balanced mix design approach was used successfully in selecting the optimum binder content for each CIR mixture. Experimental and statistical evaluations were also conducted on CIR mixtures prepared with optimum binder contents. The results showed that using a higher compaction level or higher temperature of curing leads to increasing both foamed and emulsified asphalt CIR mixtures' ability to resist rutting. In terms of cracking, SCB-FE results showed that emulsified asphalt CIR mixtures were better at resisting cracking than foamed asphalt CIR mixtures.

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