Hw 1 - CCEV360-04 January 19, 2008 Dillon Gauthier Atkins...

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CCEV360-04 January 19, 2008 Dillon Gauthier Atkins Ch. 4 #1-17 1. Aggregates are granular mineral particles used either in combination with various types of cementing material to from concretes or alone as road bases or backfill. 2. Sources of aggregates: a. Natural sand and gravel deposits b. Crushed rock c. Slag and mine refuse d. Artificial and processed materials e. Pulverized concrete and asphalt pavements f. Recycled waste materials 3. Coarse aggregate – particles mainly larger than No. 4 sieve. Fines – silt, clay or dust particles smaller than No. 200 sieve. Deleterious. Crushed gravel – pit gravel that has been put through a crusher either to break many of the rounded gravel particles to a smaller size or to produce rougher surfaces. Crushed rock – aggregate from the crushing of bedrock. All particles are angular, not rounded as in gravel. Concrete sand – sand that has been washed to remove dust and fines. 4. Fine aggregate has a nominal maximum size of 4.75mm [No. 4]. The actual size specified for fine aggregate is 5%-10% passing the 9.5mm sieve. 5.
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Hw 1 - CCEV360-04 January 19, 2008 Dillon Gauthier Atkins...

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