CIVE 2700 Lecture Notes - Lecture 16: Moraine, Hydrometer, Sieve Analysis
9 Dec 2017
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Document Summary
Necessity of studying soil: unanticipated action of water, frost action in soils, unexpected settlements of soils, lateral displacements of soil. Description of soil: consists of solid particles, water, air, particles are a result of weathering of rocks and organic decay of vegetation. Weathering of rock: physical weathering: freeze and thaw, abrasion (scraping) from glaciers, activity of plants+animals, chemical weathering: reaction of rock minerals with, oxygen (e. g. oxidation- fe2o3 ), acids, salts, also carbonation and leaching. Properties of soils: gravel, sands, silts, cohesionless, non-plastic, granule, clays, cohesive and plastic, develops plasticity with mix with water, organic soils, weak and deform excessively under load, should not be used as foundations (because of excessive settlement) Contains boulders, foundation material and as aggregate for concrete. rock fragments, gravel, sand, silt and clay in various proportions. Used as a: moving water (fluvial, fluvial deposits are sorted by size based on the velocity of the water.
