Civil Engineering Reference
In-Depth Information
T ABLE 9.4
Penetration Grading System of Asphalt
Cement
Penetration
Flash Point
Ductility
Grade
min.
max.
°C (°F)
(cm)
40-50
40
50
232 (450)
100
60-70
60
70
232 (450)
100
85-100
85
100
232 (450)
100
120-150
120
150
219 (425)
100
200-300
200
300
177 (350)
100
T ABLE 9.5
Viscosity Grading System of Asphalt Cement
Viscosity
Absolute
Kinematic*
Flash Point*
Grade
(poises)
(cSt)
Penetration*
°C (°F)
AC-2.5
250
;
50
125
220
163 (325)
AC-5
500
;
100
175
140
177 (350)
AC-10
1000
;
200
250
80
219 (425)
AC-20
2000
;
400
300
60
232 (450)
AC-30
3000
;
600
350
50
232 (450)
AC-40
4000
;
800
400
40
232 (450)
*Specification is for the minimum acceptable values
grade numbers are 1/100 of the middle of the allowable viscosity range; that
is, an AC-5 has an absolute viscosity of poises. Therefore, high
viscosity asphalt cements have a high designation number. Aged-residue
grades are based on the absolute viscosity of the asphalt after it has been con-
ditioned to simulate the effects of the aging that occur when the asphalt ce-
ment is heated to make asphalt concrete. The aged-residue grade numbers are
at the middle of the allowable viscosity range after conditioning, as shown in
Table 9.6 (ASTM D3381). For example, an AR-1000 has an absolute viscosity
of
500
;
100
1000
;
250
poises.
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