Concrete Cracking: Causes And What Can Be Done
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Overview
The presentation will cover the three main mechanisims of why concrete cracks.
Topics
Cracking due to imposed compressive force - Extremely rare, engineers and designers generally understand compressive strength needs for structures.
Cracking due to imposed flexural force - Happens occasionally, typically seen in slab on ground applications. Imposed flexural force usually as a result of:
- Insufficient support (eg sub-base washout)
- Ground movement from shrink/swell of subbase (eg clay soils)
- Ground movement from external forces (eg tree roots)
- Insufficient or inappropriate location of steel reinforcement
Cracking due to imposed tensile force - Quite common, the vast majority of cracking complaints. Imposed tensile stress due to:
- Tensile stress in the surface due to volume reduction rapid moisture loss (occurs within the first 2-24 hours post placement)
- Tensile stress in the surface due to concrete movement in early stages of post placement
- Induced tension from different rates of thermal expansion (similar to cracking glass with rapid cooling)
- Concrete drying shrinkage over time (typically occurs weeks or months post placement)
Presenter: Wayne Milligan l Technical Support Manager l Boral
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Total viewing time - 19min
Learning Module Standard Inclusions
By purchasing this Online Learning Module, you will have the opportunity to view recorded presentations (video and audio) at your own pace over a 90-day period.