CVG 2141 Lecture Notes - Lecture 2: Tricalcium Aluminate, Pascal (Unit), Gypsum

• School: University of Ottawa
• Department: Civil Engineering
• Course: CVG 2141
• Professor: Abdulridha Alaa

Document Summary

Aggregates are a granular material used a cementing medium or as foundation material/fill. Can be used as filler and reduces cost. Greater volume stability than paste (less shrinkage) Mixture of rocks and minerals, sand and gravel: rounded and smooth texture. Crushed stone: collected by crushing large rocks, boulders and gravel (e. g. granite, sandstone, limestone: angular and rough. Fine aggregate: each particle < 5mm, natural sand and crushed stone. Coarse aggregate: > 5mm (usually 10-40mm), gravel and crushed stone. Lightweight: from natural (volcanic material) or manufactured: sg = 0. 2 2. 5, fine aggregates < 1120 kg/m^3. Normal weight: from crushed stone, gravel, sand: sg = 2. 6 2. 85, 1520 1680 kg/m^3. Heavy weight: from iron ores: sg = 4-5, 2400-3040 kg/m^3. Avoid flaky an elongated due to easy breakage and compacting in thin layers. High friction = angular and rough = strength and stability. Low friction = rounded and smooth = workability. Moisture content: amount water in an agg particle.