a.L Rasha jasim Mohamed Lec.10

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Presentation transcript:

a.L Rasha jasim Mohamed Lec.10 Highway engineering 12/6/2017 a.L Rasha jasim Mohamed Lec.10 Al. Rasha j. mohammed

Lec.10 Classification of aggregates A combination of different sizes and shapes normally of stones. Maximum size is 75 mm. 12/6/2017 Al. Rasha j. mohammed

• Lightweight aggregate • Normal-weight aggregate Based on Density: Based on specific gravity or density measured in bulk, aggregate is divided into 3 types: • Lightweight aggregate • Normal-weight aggregate • Heavyweight aggregate 12/6/2017 Al. Rasha j. mohammed

Normal-weight aggregate Crushed stone, gravel and ordinary sand are examples of normal weight aggregate. They are commonly used in manufacture of normal weight concrete, asphalt concrete and roadway sub-base. Bulk density of normal weight aggregate is around 1520 to 1680kg/m3. 12/6/2017 Al. Rasha j. mohammed

Lightweight aggregate Lightweight fine aggregate is any aggregate with bulk density less than 1120kg/m3 and lightweight coarse aggregate is any aggregate with bulk density less than 880kg/m3. They are commonly used as components in the manufacture of lightweight concrete, for making lightweight masonry blocks (to improved their thermal and insulating properties), and lightweight floor and roof slabs. 2 types of lightweight aggregate: • Natural lightweight aggregates (rice husk, etc). • Manufactured (also called synthetic) lightweight aggregates 12/6/2017 Al. Rasha j. mohammed

Heavyweight aggregate Those aggregate with high density and is used primarily in the manufacture of heavyweight concrete, employed for protection against nuclear radiation and as bomb shelter. The unit weight of heavyweight concrete varies from 2400kg/m3. 12/6/2017 Al. Rasha j. mohammed

Physical properties of aggregates Strength Texture Durability Porosity and Permeability Water absorption 12/6/2017 Al. Rasha j. mohammed

12/6/2017 Al. Rasha j. mohammed