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CE332 Test 2 - 01

Aggregates

TermDefinition
Aggregates Geometric properties (3) -Shape: Cubic or flat -Angularity: Round or Angular -Texture (affects bonding): From rough to smooth
Measurement of aggregate shape Proportional caliper devise to measure the dimensional ratio
Course aggregate angularity Angular particles have one or more fractured (flat) face
Aggregates Geometric properties determine (2): Stability (Packing and loading) Workability
Soundness Ability of an aggregate to withstand freeze and thaw Sulfate soundness test: Internal expansive forces that create cracking of an aggregate +See more on slides
Aggregate Toughness/Abrasion resistance Resistance to crushing, degradation and disintegration when stockpiled, mixed, and exposed to load LA Abrasion Test: aggregate tested and subjected to impacts and gridding in a large steel drum with steel balls
Delirious materials Contamination of aggregate by clay, shale, and other organic matter
Clay Content percentage of clay material in an aggregate Measured using the sand equivalency test
Moisture conditions (4) -Bone Dry -Air Dry -Saturated Surface Dry (SSD) -Saturated Surface Wet (SSW)
Unit Weight and Voids As unit weight increase, Voids decrease (More filled and pack means less voids)
Aggregate gradation Sieve analysis Percentage passing of total aggregate in each sieve size from largest to smallest
Aggregate Size: NOMINAL MAX One size larger than the first sieve to retain more than 10%
Aggregate Size: MAXIMUM one size larger than the nominal max
Maximum Density line Gradation that will yield highest density and lowest void content FHWA proposed a power of 0.45 line graph
Fineness modulus (4) Measure of gradation fineness Finer aggregates require more cement paste due to high surface area Ri: Sum of cumulative parentage retained Low FM = finner aggregate
Gradation blend: Mathematical approach *see slides for graphed approach -Start at largest difference of percentage passing -Must meet the spect -Rule of mixtures to find percentage -Check the rest of the percentages
Created by: BrendaTovar3223
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