lec20 - Concrete"Concreting the environment Exposed...

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Concrete ± "Concreting the environment" ± Exposed concrete Internal composite structure hidden Surface’s texture = formwork
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Concrete ± Formwork and concrete texture
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Concrete ± Concrete material Cement Water Aggregates (fine and coarse) Cement Water Fine agg. Coarse agg. Cement Water Air Fine agg. Coarse agg. Cement Fine agg. Coarse agg. Percentage by surface area Percentage by volume Percentage by weight 9-18 6-9 23-35 33-35 7-15 2-6 22-32 30-48 93-95 4-6 0.5-1 14-19 Image by MIT OCW.
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Concrete ± Concrete material Cement ­ Extraction and breaking-down ­ Mixing and crushing, drying Æ dust ­ Heating Æ clinker ­ Grinding, sometimes adding of mineral substances
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Concrete ± Reinforced Concrete Concrete for compression, steel for tension Steel at maximal bending moments Compacting Concrete already compacted Level of concrete before compaction Image by MIT OCW.
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Concrete ± Concrete building elements Beams Unloaded Unloaded Reinforced Loaded Loaded Prestressed Image by MIT OCW.
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Concrete ± Concrete building elements Beams Colums Arches Slabs Image by MIT OCW. Image by MIT OCW. Element (loadbearing) Slab on walls Flat slab on columns, conventional
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