Lecture2_-_Agg_orgin_propoerties

Lecture2_-_Agg_orgin_propoerties - Lecture 2: Aggregates...

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CON 3400 - Fall 2007 1 Lecture 2: Aggregates Construction Materials – CM 3400 Origins of Aggregate ± Aggregates usually refers to a soil that has in some way been processed or sorted. ± The grains of aggregates are formed by weathering of rocks. ± The size of the individual grains varies widely. ± Type of rocks that can create aggregates: ± Igneous rock ± Sedimentary rock ± Metamorphic rock Igneous Rock ± Crystalline solids formed by the solidification of magma (liquid phase of rock). ± Magmas exist in the liquid state deep in the earth crust (high temperature and low pressure) crust (high temperature and low pressure). ± Ejection of the magma either through fissure eruption or volcanic eruption.
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CON 3400 - Fall 2007 2 Fissure and Volcanic Eruptions Fissure Eruption : lava erupts from an elongated fissure (crack) Volcanic Eruption : Lava erupts from a central point forming a volcano Intrusive Igneous Rock (Plutons) Types of Igneous Rocks Name of Rock Texture Abundant Minerals Picture Granite Coarse Quartz, sodium feldspar, potassium feldspar Basalt Fine Plagioclase, pyroxenes, Olivine. Syenite Coarse Potassium feldspar Peridotite Coarse Olivine, pyroxenes Weathering ± The process of breaking down rocks by mechanical or chemical processes into smaller pieces. Mechanical Weathering ± Mechanical Weathering: ± Expansion and contraction of rocks (disintegration) ± Water seepage into cracks in rocks (freezes). ± Wind, rivers, ocean waves. ± No change into chemical composition.
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CON 3400 - Fall 2007 3 Sedimentary Rocks ± Two types of sedimentary rocks: ± Detrital sedimentary rocks: formed by weathered deposits compacted and cemented by agents like iron oxide, quartz (e.g., sandstone). ± Chemical Sedimentary Rocks: chemical deposition
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Lecture2_-_Agg_orgin_propoerties - Lecture 2: Aggregates...

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