VOLUMETRIC ANALYSIS OF HMA MIXTURES

[Pages:59]VOLUMETRIC ANALYSIS OF HMA

MIXTURES

Volumetric Analysis of HMA Mixtures

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Volumetrics

? All matter has mass and occupies space

? Volumetrics are the relationships between mass and volume

Volumetric Analysis of HMA Mixtures

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Specific Gravity, G

Mass

Volume * w

Volumetric Analysis of HMA Mixtures

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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

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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

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Volumetric Relationships

Va Vb Vba

VMA

Vmb Vse Vmm Vsb

Volumetric Analysis of HMA Mixtures

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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

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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

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