Page 367 - Mechanics of Asphalt Microstructure and Micromechanics

Digital Specimen and Digital T est-Integration of Microstructure into Simulation 359

Mixes Parameter f Initial Yield Stress Y 0 (Mpa)
AC = 5.6% 0.9 0.037
AC = 6.0% 0.85 0.032
AC = 6.4% 0.8 0.028
TABLE 10.5 Parameter f and initial yield stress Y 0 .

A n m B C D
2.3E-3 0.8 –0.24 1.0E-2 3 4.5
TABLE 10.6 Other parameters.

10.4 Other Approaches to Incorporate Microstructure into Simulation
10.4.1 Micromechanical Finite Element Method
Dai et al. (2004) presented a micro-finite element method (MFEM). Each contact pair is
modeled as an element between two aggregate particles with a binder layer in between.
Figure 10.45 presents the idealization and the element analysis. Through element analy-
sis, the element stiffness matrix can be established.

(10-7)

Aggregate

Void
z
w 1 w 2
Cement
Binder
Binder
h 0
x
Element Line

a. Idealized microstructure b. Element analysis
FIGURE 10.45 Illustration of the MFEM (Courtesy Qingli Dai and Sadd).