The Superpave volumetric procedure has been widely implemented, with success- ful results. However, the method lacks a strength test to verify the suitability of the Superpave mixes. Research completed in NCHRP Project 9-19 developed "simple performance tests" for asphalt concrete (Witczak et al., 2002), currently called the Asphalt Mixture Performance Tester, AMPT, Figure 9.34. The AMPT is not currently a requirement for Superpave mix design, but implementation studies are underway. In addition, the test method was designed to capture the material properties needed for the Mechanistic Empirical Pavement Design System, MEPDS. The equipment and associated protocols of the AMPT tests are designed to cap- ture the viscoelastic behavior of asphalt concrete. Tests based on measurement of dynamic modulus (for both of permanent deformation and fatigue cracking), flow time (permanent deformation), and flow number (permanent deformation) were selected for further field validation. The three tests used to obtain these parameters are the dynamic modulus test, triaxial static creep test, and triaxial repeated load permanent deformation test. All these tests use cylindrical specimens 100 mm in UTS Instro Cek) FIGURE 9.34 Asphalt Mixture Performance Tester. diameter and 150 mm high. Specimens are cored in the lab from specimens com- pacted using the Superpave gyratory compactor.
The Superpave volumetric procedure has been widely implemented, with success- ful results. However, the method lacks a strength test to verify the suitability of the Superpave mixes. Research completed in NCHRP Project 9-19 developed "simple performance tests" for asphalt concrete (Witczak et al., 2002), currently called the Asphalt Mixture Performance Tester, AMPT, Figure 9.34. The AMPT is not currently a requirement for Superpave mix design, but implementation studies are underway. In addition, the test method was designed to capture the material properties needed for the Mechanistic Empirical Pavement Design System, MEPDS. The equipment and associated protocols of the AMPT tests are designed to cap- ture the viscoelastic behavior of asphalt concrete. Tests based on measurement of dynamic modulus (for both of permanent deformation and fatigue cracking), flow time (permanent deformation), and flow number (permanent deformation) were selected for further field validation. The three tests used to obtain these parameters are the dynamic modulus test, triaxial static creep test, and triaxial repeated load permanent deformation test. All these tests use cylindrical specimens 100 mm in UTS Instro Cek) FIGURE 9.34 Asphalt Mixture Performance Tester. diameter and 150 mm high. Specimens are cored in the lab from specimens com- pacted using the Superpave gyratory compactor.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:The Superpave volumetric procedure has been widely implemented, with success-
ful results. However, the method lacks a strength test to verify the suitability of the
Superpave mixes. Research completed in NCHRP Project 9-19 developed "simple
performance tests" for asphalt concrete (Witczak et al., 2002), currently called the
Asphalt Mixture Performance Tester, AMPT, Figure 9.34. The AMPT is not currently
a requirement for Superpave mix design, but implementation studies are underway.
In addition, the test method was designed to capture the material properties needed
for the Mechanistic Empirical Pavement Design System, MEPDS.
The equipment and associated protocols of the AMPT tests are designed to cap-
ture the viscoelastic behavior of asphalt concrete. Tests based on measurement of
dynamic modulus (for both of permanent deformation and fatigue cracking), flow
time (permanent deformation), and flow number (permanent deformation) were
selected for further field validation. The three tests used to obtain these parameters
are the dynamic modulus test, triaxial static creep test, and triaxial repeated load
permanent deformation test. All these tests use cylindrical specimens 100 mm in
UTS
Instro Cek)
FIGURE 9.34 Asphalt Mixture
Performance Tester.
diameter and 150 mm high. Specimens are cored in the lab from specimens com-
pacted using the Superpave gyratory compactor.
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