chapter15 - CE 222 Highway Engineering Notes for Chapter 15...

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CE 222 Highway Engineering Notes for Chapter 15 Highway Materials Materials that are used in highways include soils, aggregates, asphalt materials, and concrete cement Materials Surface Asphalt materials/cement Base Aggregate Sub-base Aggregate Soil In this chapter students should understand properties of soils, aggregates, asphalt materials and concrete cements. More attention should be placed on soils. 1. Soils Types of soils: Boulder -> coarse gravel -> medium gravel -> Fine gravel -> coarse sand -> find sand -> Silt -> clay Basic Soil Properties: Moisture contents W% = (Wa+Ww)/ Ws * 100 Specific Gravity: Unit weight dry unit weight and wet unit weight See equation 15-2 Air (Wa) Water (Ww) Solid (Ws)
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Shearing Resistance Caused by internal friction Other soil properties: Permeability, capillarity, shrinkage, swelling, compressibility, elasticity Soil Classification: AASHTO classification system and Unified classification system AASHTO classification system: Sieve analysis for gradation
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This note was uploaded on 02/09/2009 for the course CE 222 taught by Professor Jia during the Winter '09 term at Cal Poly Pomona.

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chapter15 - CE 222 Highway Engineering Notes for Chapter 15...

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