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Footing and Foundation Inspection II

Footing and Foundation Inspection II. Module five. Review. When suitable materials are used in making concrete what will it influence? workability, strength, durability, appearance and cost

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Footing and Foundation Inspection II

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  1. Footing and Foundation Inspection II Module five

  2. Review • When suitable materials are used in making concrete what will it influence? • workability, strength, durability, appearance and cost • What 2 materials would adversely affect the curing of concrete if it happened to be part of the mix? (slow or speed curing) • sugar will slow curing • salt will speed curing

  3. Review • After how many days should concrete reach its required strength if cured properly? • 28 days • What is the best temperature for curing concrete? • 23º C

  4. Review • What are some of the possible causes of excessive concrete shrinkage? • improper design mix • to much water • inadequate curing • lack of protection from • wind, high or low temperatures

  5. Review • In very cold conditions an additive that is commonly used in concrete is calcium chloride. What must you be aware off? • when using calcium chloride with reinforcing steel in the concrete it will cause corrosion and possible surface cracking

  6. Module Five Houses that have basements require that the foundations be: • structurally sound • resistant to water penetration • comfortable If you build during cold weather you need to understand how freezing causes damage.

  7. Freezing Pressure caused by freezing is • 9 Mpa / °Cup to 200 Mpa @ -20°C • when water freezes its volume increases by 9% • volume increases will depend on the type of soil adjacent and below foundations • considerable volume changes will occur in fine sand, silt and clay

  8. Protection Protection of soil prior to placing concrete will prevent problems • placing concrete on frozen soil will lose heat to the soil and may freeze, resulting in lower strength • protect the soil by covering with • 12” of straw, minimum of 3” insulating blankets • cover with plastic/tarps and introduce mechanical means of heat

  9. Work period Do exercise 1 and 2

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