VOLUMETRIC ANALYSIS OF HMA MIXTURES
[Pages:59]VOLUMETRIC ANALYSIS OF HMA
MIXTURES
Volumetric Analysis of HMA Mixtures
1
Volumetrics
? All matter has mass and occupies space
? Volumetrics are the relationships between mass and volume
Volumetric Analysis of HMA Mixtures
2
Specific Gravity, G
Mass
Volume * w
Volumetric Analysis of HMA Mixtures
3
Basic Terms
? Specific Gravity (G): Gxy
? x:
b = binder
s = stone (i.e., aggregate)
m = mixture
? y:
b = bulk
e = effective
a = apparent
m = maximum
? Example:
? Gmm = gravity, mixture, maximum (i.e., maximum gravity of the mixture)
Volumetric Analysis of HMA Mixtures
4
Basic Terms (cont.)
? Mass (P) or Volume (V) Concentration: Pxy or Vxy
? x:
b = binder
s = stone (i.e., aggregate)
a = air
? y:
e = effective
a = absorbed
? Example:
? Pb = percent binder
Volumetric Analysis of HMA Mixtures
5
Volumetric Relationships
Va Vb Vba
VMA
Vmb Vse Vmm Vsb
Volumetric Analysis of HMA Mixtures
6
HMA Volumetric Terms
? Bulk specific gravity (Gmb) of compacted HMA
? Maximum specific gravity (Gmm) ? Air voids or voids total mix (Va) ? Effective specific gravity of aggregate (Gse) ? Voids in mineral aggregate, VMA ? Voids filled with asphalt, VFA
Volumetric Analysis of HMA Mixtures
7
Gmb of Compacted HMA
? AC mixed with agg. and compacted into
sample
Mass agg. and AC
Gmb =
Vol. agg., AC, air voids
Vmb
Volumetric Analysis of HMA Mixtures
8
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