Lecture 4 Concrete

Lecture 4 Concrete - Concrete Slabs on Grade CEIE 525...

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Concrete Slabs on Grade CEIE 525 Structural 1
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Slab on Grade supported directly on the ground often abbreviated to SOG on drawings sometimes called slab on ground typical cross section CEIE 525 Structural 2
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Slab on grade CEIE 525 Structural 3
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Slab on Grade simple slabs reinforced with WWF WWF welded wire fabric WWF used to be called welded wire mesh CEIE 525 Structural 4
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Slab on Grade typical cross section for simple SOG – uniform or variable thickness – reinforcement – joints – finish – base and/or subbase – compacted subgrade CEIE 525 Structural 5
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Slab on Grade SOG reinforcement – WWF for simple slabs – steel reinforcing bars – top and bottom reinforcing – post tensioned tendons – prestressing CEIE 525 Structural 6
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Slab on Grade CEIE 525 Structural 7
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Slab on Grade SOG reinforcement – steel reinforcing bars – top and bottom bars CEIE 525 Structural 8
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Slab on Grade CEIE 525 Structural 9
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Slab on Grade CEIE 525 Structural 10
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Slab on Grade SOG reinforcement – prestressing tendons – post tensioned tendons CEIE 525 Structural 11
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Slab on Grade CEIE 525 Structural 12
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Slab on Grade subject to complex loading conditions static loads moving loads heavy loads (US Army Recommendations) elastic foundation interaction with the supporting soil CEIE 525 Structural 13
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Slab on grade CEIE 525 Structural 14
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Slab on Grade water penetration through slab moisture emission from surface vapor barrier vs vapor retarder damage to floor finishes and coatings potential mold issues ACI’s latest position on retarder location CEIE 525 Structural 15
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Slab on grade CEIE 525 Structural 16
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Slab on Grade condition assessment review of drawings and documentation field observation and investigation testing program – reinforcing steel – coring – petrographic analysis need for geotechnical investigation? CEIE 525 Structural 17
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Slab on Grade Condition Assessment: ACI 201.1R “Guide for Making a Condition Survey of Concrete in Service” ACI 201.3R “ Guide for Making a Condition Survey of CEIE 525 Structural 18
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Slab on Grade Ultimate question: Does the slab need replaced or can it be repaired for the proposed use? CEIE 525 Structural 19
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PCA Concrete Technology Portland Cement Association Q: What causes concrete to crack? A: Cracking can be the result of one or a combination of factors, such as drying shrinkage, thermal contraction, restraint (external or internal) to CEIE 525 Structural 20
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PCA – Concrete Technology Crazing is a pattern of fine cracks that do not penetrate much below the surface and are usually a cosmetic problem only. They are barely visible, except when the concrete is drying after the surface has CEIE 525 Structural 21
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Surface Crazing CEIE 525 Structural 22
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Plastic Shrinkage: When water evaporates from the surface of freshly placed concrete, the surface concrete shrinks. Due to the
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Lecture 4 Concrete - Concrete Slabs on Grade CEIE 525...

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