cnst 202 ch2 - Chapter 2 Aggregates Aggregate Aggregates...

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Chapter 2 - Aggregates Aggregate Aggregates include sand, gravel, stone Many are useful in construction in their natural state, and are simply mined in quarries or pits. Some processing might be needed, such as sorting and washing Major uses Roadway bases - for drainage and stability Concrete - combines with water and cement for strength Ballast - weight for roofs and RR tracks Landscaping and grading - final topography on sites Terminology Coarse aggregates - larger sizes (gravel and stone) Fine aggregates - smaller sizes (sand) Gravel - used in a natural state “smooth” Crushed gravel - fractured particles Crushed stone - fractured pieces of natural deposits such as limestone Sieve Sieves are used to size aggregates according to their size Particle size is important in many applications such as concrete mixing Construction specifications will use sieve sizing to define aggregate requirements Soils and aggregates Soil is composed of aggregates and decomposed organic material Most construction requires removal of organic material due to its instability overburden Organic material is used for landscaping and a base for lawns
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