CH05_Aggregates_Talking-Points

CH05_Aggregates_Talking-Points - CEE 353 Civil Engineering...

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CEE 353 – Civil Engineering Materials CHAPTER 5 Aggregates Aggregates
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Chapter 5: Aggregates Dr. Javed Bari 2 5.0 Mineral Aggregates h gravel (coarse aggregate = C.A.) h sand (fine aggregate = F.A.) h s decomposed granite (DG) h not soil; silt or clay (fines) Uses: h under foundations and pavements for stability & drainage h as fillers s PCC s HMA 80% of volume & 90~96% of weight
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Chapter 5: Aggregates Dr. Javed Bari 3 5.1 Sources Natural: natural sand & gravel pits, river rock, rock quarries, etc. crushed/uncrushed stone Manufactured & recycled materials: pulverized concrete & asphalt, steel mill slag, steel slugs, styrofoam, etc. 5.2 Geological Classification Igneous Sedimentary Metamorphic.
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Chapter 5: Aggregates Dr. Javed Bari 4 5.5 Aggregate Properties h Shape = angular, rounded, flaky, or elongated h 5.5.2 h ability to resist weathering h freezing water in voids fractures & disintegrates aggregates h resist damage to load h LA abrasion test -- rotated in drum with steel balls.
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CH05_Aggregates_Talking-Points - CEE 353 Civil Engineering...

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