Qingli Dai,
Ph.D.

Assistant Professor

Department of
Civil and Environmental Engineering

Michigan Technological University

Office: Dow 819

Phone: 906-487-2620

Email: qingdai@mtu.edu

**RESEARCH
INTERESTS**

1.
Computational
analysis for material research: multiscale modeling,
finite element analysis, discrete element analysis, constitutive modeling,
fracture simulation and molecular dynamics

2.
Properties
and performance of asphalt mixtures

3.
Cement
microstructure and concrete durability

4.
Self-healing
construction materials, alternative and emerging materials

5.
Active
piezoelectric materials, structural damping control

6.
Acoustic
emission damage detection, X-ray tomography, imaging processing

**Research
Group**

** **

** ****Current Ph.D. Students:**

Xiao Sun

Weina Meng

Kenny Ng (to
graduate in Dec 2012)

** Master
Students:**

**Undergraduate
Students:**

** **Jordan Hoekwater

Thaddus
Waterman

We like to
invite the **Graduate research assistants**
to join our research group. My current
research interests are computational modeling of infrastructure materials such
as asphalt mixtures and concrete, self-healing materials, fracture or damage
mechanism, constitutive properties, and advanced experimental techniques. My goal is to develop integrated numerical
and experimental techniques for sustainable infrastructure applications. Sound
material and computational mechanics background is preferred. Please send your **C.V. and transcripts** to me
(qingdai@mtu.edu) if interested. You also need apply Ph.D. program in Civil
Engineering at MTU.

**REFEREED
JOURNAL PUBLICATIONS**

*Under Review*

*Dai,
Q., Ng, K., Liu, Y., and Yu, X. "Investigation of Internal Frost Damage in
Concrete with Thermodynamic Analysis, Micro-Damage Modeling and Time-Domain Reflectometry Sensor Measurements."** Journal of Materials in
Civil Engineering, ASCE, submitted.*

*Ng, K. and Dai, Q. “2D And
3D Cohesive Zone Modeling of Fracture Behavior in Cement or Concrete Samples
with Characterized Imaging Microstructures”, Journal of Materials in Civil
Engineering, ASCE, submitted.*

*Year 2012*

*Dai, Q. and Ng, K. (2012)
“Investigation of Electromechanical Properties of Piezoelectric Structural
Fiber Composites with Micromechanics Analysis and Finite Element Modeling”,
Mechanics of Materials, Elsevier, 53, 29–46.
http://dx.doi.org/10.1016/j.mechmat.2012.04.014.*

*Dai, Q., Ng, K., Zhou, J., Kreiger, E.L. and Ahlborn, T. M.
(2012), “Damage Investigation of Single-Edge Notched Beam Tests with Normal
Strength Concrete and Ultra High Performance Concrete Specimens using Acoustic
Emission Techniques,” Construction and Building Materials, Elsevier, 31,
231-242.*

*Ng, K. and Dai, Q. (2012),
“Tailored Extended Finite-Element Model for Predicting Crack Propagation and
Fracture Properties within Idealized and Digital Cementitious
Material Samples,” Journal of Engineering Mechanics, ASCE, 138 (1), 89-100, http://ascelibrary.org/emo/resource/1/jenmdt/v138/i1/p89_s1*

*Year 2011*

Ng,
K. and Dai, Q. (2011), “Investigation of Micro-Crack Behavior of Infrastructure
Materials with EXtended Finite Element Method and
Image Analysis,” Journal of Materials in Civil Engineering, ASCE, Vol. 23 (12),
1662-1671.

Dai, Q., Yu, X., Ng, K. and Liu, Z. (2011), “Development of
Micromechanics Models and Innovative Sensor Technologies to Evaluate
Internal-Frost Damage of Concrete,” Journal of the Transportation Research
Board, National Academies, No. 2240, 50-58.

Dai,
Q. (2011), “A Three-Dimensional Micromechanical Finite Element Network Model
for Damage-Coupled Elastic Behavior of Stone-Based Composite Materials,”
Journal of Engineering Mechanics, ASCE, 137, 6, 410-421.

Liu, Y., You, Z., Dai, Q., and Mills-Beale, J. (2011).
"Review of advances in understanding impacts of mix composition
characteristics on asphalt concrete (AC) mechanics." International Journal
of Pavement Engineering, 12(4), 385-405.

You, Z., Liu, Y., and Dai, Q. (2011), "Three-dimensional Microstructural-based
Discrete Element Viscoelastic Modeling of Creep Compliance Tests for Asphalt
Mixtures." Journal of Materials in Civil Engineering,
ASCE, 23, 1, 79-87.

*Year 2010*

Dai, Q. (2010), “Two- and Three-Dimensional Micromechanical
Viscoelastic Finite Element Modeling of Stone-Based Materials with X-Ray
Computed Tomography Images,” Construction & Building Materials, Elsevier,
25, 1102-1114.

You, Z., Mills-Beale, J., Foley, J. M., Roy, S., Odegard,
G. M., Dai, Q., and Goh, S. W. (2010).
"Nanoclay-modified asphalt materials:
Preparation and characterization." Construction and Building Materials,
25, 1072-1078.

Dai,
Q. (2010), “Micromechanical Viscoelasto-Plastic
Models and Finite Element Implementation for Rate-Independent and
Rate-Dependent Permanent Deformation of Stone-Based Materials,” International
Journal for Numerical and Analytical Methods in Geomechanics,
Wiley InterScience, 34 (13), 1321-1345.

Dai, Q. (2010), “Prediction of Dynamic Modulus and Phase Angle of Stone-Based
Composites using Micromechanical Finite Element Approach,” Journal of Material
in Civil Engineering, ASCE, 22 (6), 618-627.

*Year 2009*

Dai, Q. and You, Z. (2009),
“Micromechanical Finite Element Framework for
Predicting Viscoelastic Properties of Heterogeneous Asphalt Mixtures,” *Materials
and Structures, *Springer
Netherlands*,* Vol. 41(6), pp.1025-1037, ISSN: 1359-5997 (Print) 1871-6873 (Online), Online at http://www.springerlink.com/content/6272035711512866

You, Z., Adhikari,
S., Masad, E., and Dai, Q. (2009), “Microstructural
and Micromechanical Properties of Field and Lab-Compacted Asphalt Mixtures,” *Journal
of Association of Asphalt Paving Technologists* (AAPT), Vol. 78, 2009
(scheduled).

Liu,
Y., Dai, Q., You (2009), “Development of a Viscoelastic Model for Discrete
Element Simulation of Asphalt Mixtures,” *Journal of Engineering Mechanics*,
ASCE, accepted for publication on 04/22/2008, scheduled for April issue of 2009.

You,
Z., Adhikari, S., and Dai, Q. (2009), “Air Void
Effect on An Idealized Asphalt Mixture Using a Two-Dimensional and
Three-Dimensional Discrete Element Modeling Approach,” *International Journal
of Pavement Engineering*, accepted for publication 09/02/2007.

You,
Z., Mills-Beale, J., Williams, R.C., and Dai, Q. (2009), “Measuring the
Specific Gravities of Fine Aggregates in Michigan: An Automated Procedure,” *International Journal of Pavement Research
and Technology*, Vol. 2(2), pp.37-50, ISSN 1996-6814.

Mills-Beale, J., You, Z.,
Williams, R.C., and Dai, Q. (2009), “Determining the Specific Gravities of
Coarse Aggregates in Michigan Utilizing Vacuum Saturation Approach,” *Construction & Building Materials*,
Elsevier, Vol. 23(3), pp.1316-1322.

*Year
2008*

You, Z., Adhikari, S., and Dai, Q. (2008), “Three-Dimensional Discrete Element Models for
Asphalt Mixtures,” *Journal of Engineering Mechanics, ASCE*, Vol.
134(12), pp.1053-1063.

Year 2007

Dai, Q. and You, Z. (2007) “Prediction of Creep
Stiffness of Asphalt Mixture with Micromechanical Finite Element and Discrete
Element Methods,” *Journal of Engineering Mechanics, *ASCE, Vol. 133(2), pp.163-173.

You, Z. and Dai, Q. (2007), “A Review of Advances in
Micromechanical Modeling of Aggregate-Aggregate Interaction in Asphalt
Mixture,” *Canadian Journal of Civil
Engineering /Rev. can. génie
civ.*, Vol. 34(2), pp.1519-1528, ISSN: 1208-6029

You, Z. and Dai, Q., (2007), “Complex Modulus
Predictions of Asphalt Mixtures Using a Micromechanical -Based Finite Element
Model,” *Canadian Journal of Civil
Engineering /Rev. can. génie
civ.*, Vol. 34(12), pp.1-10, ISSN: 1208-6029

*Year 2006*

Dai, Q., Sadd, M.H. and You,
Z. (2006), “A Micromechanical Finite Element Model
for Linear and Damage-Coupled Viscoelastic Behavior of Asphalt Mixture,” *International*
*Journal for Numerical and Analytical Methods in Geomechanics,* Wiley InterScience,*
*Vol. 30(11), pp.1135-1158.

*Year 2005*

Dai, Q., Sadd,
M.H., Parameswaran, V. and Shukla,
A. (2005), “Prediction of Damage Behaviors in
Asphalt Materials using a Finite Element Micromechanical Model and Image
Analysis,” *Journal of Engineering Mechanics,* ASCE, Vol. 131(7),
pp.668-677*.*

Sadd, M.H. and Dai,
Q. (2005), “A
Comparison of Micromechanical Modeling of Asphalt Materials Using Finite
Elements and Doublet Mechanics,” *Mechanics of Materials*, Elsevier, Vol.
37(6), pp.641-662.

*Year
2004*

Dai, Q., and Sadd,
M.H. (2004), “Parametric
Model Study of Microstructure Effects on Damage Behavior of Asphalt Samples,”
*International Journal of Pavement Engineering, *Vol. 5(1), pp.19-30*.*

Sadd, M.H., Dai,
Q., Parameswaran,
V. and Shukla, A. (2004), “Simulation of Asphalt Materials Using a Finite Element
Micromechanical Model with Damage Mechanics,” *Journal of Transportation
Research Board*, National Academy of Sciences, No.1832, pp.86-95.

Sadd, M.H., Dai, Q., Parameswaran, V. and Shukla, A. (2004), “Microstructural

__REFEREED conference AND ASCE (American Society of Civil
Engineers) Special Publications__

**ACTIVE
FUNDED
PROJECTS**

The primary objective of this research is to explore microfluidic encapsulation methods to fabricate self-healing microfibers with unprecedented morphology control and material flexibility. Currently, spherical microcapsules, prepared by emulsification processes, account for the limited availability of healing agent and lack of multi-cycle healing capability. Self-healing microfibers are proposed to provide better healing performance with lower concentration and multiple healing capabilities. Microfluidic encapsulation will be investigated to generate elongated compound droplets as self-healing microfibers and gain better understanding on the control of the fabrication process. The proposed micro-encapsulator is expected to become a fabrication platform to systematically investigate the impact of microcapsule size and morphology on the bulk property of self-healing composite, which hasn’t been adequately supported by the existing fabrication methods. The micromechanical modeling and testing methods are expected to further our understanding on this fundamental issue and provide a guideline for the design of future self-healing systems.

Principal
Investigator: Zhanping You, QingliDai

• CE4201: Matrix Structural Analysis, fall
2009, fall 2010 and fall 2011

• CE5202: Finite Element Analysis, spring 2009, 2010 and 2011

• MEEM 5150: Advanced Mechanics of Materials, spring 2008

• MEEM 2110: Statics, spring 2007 and 2008

• MEEM4990 – Special Topics in Mechanical Engineering, summer 2007

• MEEM 4405: Introduction to Finite Element Methods, summer 2007, 2009 and 2010

**Editorship:**

*Associate
Editor, *ASCE Journal of
Materials in Civil Engineering

Committee Member, ASCE Granular Materials Committee, Engineering Mechanics Institute, 2010-present

Committee
Member, ASCE Bituminous Materials Committee, Construction Institute,
2011-present

Committee
Member, ASCE Pavement Committee, Geo-Institute, 2011 - present

Committee
Member, ASCE Geophysics Committee, Geo-Institute, 2011 - present