AGGREGATES - Materials for Civil and Construction Engineers - page 164

T ABLE 5.1 Basic Aggregate Properties (Meininger and Nichols, 1990)

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Property Relative Importance for End Use

Portland Asphalt Base

Cement Concrete

Concrete

PHYSICAL
Particle shape (angularity) M V V

Particle shape (flakiness, elongation) M M M

Particle size—maximum M M M

Particle size—distribution M M M

Particle surface texture M V V

Pore structure, porosity V M U

Specific gravity, absorption V M M

Soundness—weatherability V M M

Unit weight, voids—loose, compacted V M M

Volumetric stability—thermal M U U

Volumetric stability—wet/dry M U M

Volumetric stability—freeze/thaw V M M

Integrity during heating U M U

Deleterious constituents V M M

CHEMICAL
Solubility M U U

Surface charge U V U

Asphalt affinity U V M

Reactivity to chemicals V U U

Volume stability—chemical V M M

Coatings M M U

MECHANICAL
Compressive strength M U U

Toughness (impact resistance) M M U

Abrasion resistance M M M

Character of products of abrasion M M U

Mass stability (stiffness, resilience) U V V

Polishability M M U

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V = Very important M = Moderately important U = Unimportant or importance unknown

and texture requirement. A crushed particle exhibits one or more mechani-
cally induced fractured faces and typically has a rough surface texture. To
evaluate the angularity and surface texture of coarse aggregate, the percent-
ages of particles with one and with two or more crushed faces are counted
in a representative sample.
For fine aggregate, angularity and surface texture can be measured indi-
rectly using the ASTM C1252 method, Test Method for Uncompacted Void
Content of Fine Aggregate. In this test a sample of fine aggregate is poured
into a small cylinder by flowing it through a standard funnel, as shown in