Title page for ETD etd-011712-161505

Document Type thesis

Author Name Xu, Yichao

Email Address xycfrank at gmail.com

URN etd-011712-161505

Title Investigation of Effects of Moisture Susceptibility of Warm Mix Asphalt (WMA) Mixes on Dynamic Modulus and Field Performance

Degree MS

Department Civil & Environmental Engineering

Advisors
Rajib B. Mallick, Advisor
Mingjiang Tao, Co-Advisor
Tahar El-Korchi, Department Head

Keywords
moisture
WMA
dynamic modulus

Date of Presentation/Defense 2012-01-20

Availability unrestricted

Abstract
Residual moisture from incompletely dried aggregates would most likely remain in the Warm Mix Asphalt (WMA) due to its lower production and compaction temperature, resulting in harmful effects on field performance. Dynamic modulus has been recognized as a parameter that reflects the overall behavior of asphalt mixtures and possesses promising correlations with field performance. This study aims to investigate the effects of moisture susceptibility of WMA on dynamic modulus and simulate the field performance with the aid of Mechanistic-Empirical Pavement Design Guide (MEPDG) software. Four distinct sets of WMA specimens were prepared as follows: 1. fully dried aggregates without moisture conditioning; 2. fully dried aggregates with moisture conditioning; 3. incompletely dried aggregates without moisture conditioning; and 4. incompletely dried aggregates with moisture conditioning. Simple Performance Test (SPT) was employed to collect the raw data of dynamic modulus tests and master curves were constructed from the reduced data using Hirsch model. The results show that moisture can negatively influence the dynamic modulus values and moisture conditioning had more effect than residual moisture from incompletely dried aggregates. Two types of distress, fatigue cracking and rutting, were analyzed in the simulation. Moisture can significantly decrease the resistance against rutting and to a lesser extent, the resistance against fatigue cracking.

Files
xu.pdf

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Document Type	thesis
Author Name	Xu, Yichao
Email Address	xycfrank at gmail.com
URN	etd-011712-161505
Title	Investigation of Effects of Moisture Susceptibility of Warm Mix Asphalt (WMA) Mixes on Dynamic Modulus and Field Performance
Degree	MS
Department	Civil & Environmental Engineering
Advisors	Rajib B. Mallick, Advisor Mingjiang Tao, Co-Advisor Tahar El-Korchi, Department Head
Keywords	moisture WMA dynamic modulus
Date of Presentation/Defense	2012-01-20
Availability	unrestricted
Abstract Residual moisture from incompletely dried aggregates would most likely remain in the Warm Mix Asphalt (WMA) due to its lower production and compaction temperature, resulting in harmful effects on field performance. Dynamic modulus has been recognized as a parameter that reflects the overall behavior of asphalt mixtures and possesses promising correlations with field performance. This study aims to investigate the effects of moisture susceptibility of WMA on dynamic modulus and simulate the field performance with the aid of Mechanistic-Empirical Pavement Design Guide (MEPDG) software. Four distinct sets of WMA specimens were prepared as follows: 1. fully dried aggregates without moisture conditioning; 2. fully dried aggregates with moisture conditioning; 3. incompletely dried aggregates without moisture conditioning; and 4. incompletely dried aggregates with moisture conditioning. Simple Performance Test (SPT) was employed to collect the raw data of dynamic modulus tests and master curves were constructed from the reduced data using Hirsch model. The results show that moisture can negatively influence the dynamic modulus values and moisture conditioning had more effect than residual moisture from incompletely dried aggregates. Two types of distress, fatigue cracking and rutting, were analyzed in the simulation. Moisture can significantly decrease the resistance against rutting and to a lesser extent, the resistance against fatigue cracking.
Files	xu.pdf