What are the different types of concrete mixtures?
Common Types of Concrete Mixtures Used in Construction
- Normal Concrete: Normal concrete has a setting time of 30 to 90 minutes.
- High Performance Concrete: It is prepared by careful selection and preparation of the cement mixtures, with plasticizers being added to enhance its workability.
- High Strength Concrete:
- Air Entrained Concrete:
- Lightweight concrete:
Do you need a footing for a concrete slab?
While not a requirement, a concrete slab foundation provides a solid, clean surface for your steel building and can help it last longer. Since the building will require anchoring to minimize shifting, pouring a concrete slab gives you a chance to pour footings as well.
What are the main types of foundation?
Following are different types of foundations used in construction:
- Shallow foundation. Individual footing or isolated footing. Combined footing. Strip foundation. Raft or mat foundation.
- Deep Foundation. Pile foundation. Drilled Shafts or caissons.
What is the main function of foundation?
Purpose. Foundations provide the structure’s stability from the ground: To distribute the weight of the structure over a large area in order to avoid overloading the underlying soil (possibly causing unequal settlement).
What is difference between footing and foundation?
Foundation is a structure which transfers the loads from the superstructure to the ground, while footing is the foundation which is in contact with the earth. A foundation can be shallow and deep, while a footing is a type of a shallow foundation. so, all footings are foundations but all foundations cannot be footings.
What is the purpose of a footing?
Footings are the most important part of foundation construction. The purpose of footings is to support the foundation, prevent settling, and is crucial to providing the proper support for the foundation and ultimately the structure.
What is a footing on a concrete slab?
Footings are an important part of foundation construction. They are typically made of concrete with rebar reinforcement that has been poured into an excavated trench. The purpose of footings is to support the foundation and prevent settling. Footings are especially important in areas with troublesome soils.
How do you calculate footing size?
How to Calculate Footing Size
- Determine the width and length of the cement slab in inches.
- Divide the width by 12 to convert it to feet.
- Divide the length by 12 to convert it to feet.
- Determine the depth or thickness that is required for the footing in inches.
- Multiply the width by the length and then by the depth.
What should be the minimum depth of foundation?
50 cm.
How deep should footings be?
Footings need to be minimum 1m deep by 600mm wide. We always trench fill with concrete. Final decision will be with building control, hope you dont have any large trees near.
What are the grade of concrete?
Different types of concrete grades and their uses
| Concrete Grade | Mix Ratio (cement : sand : aggregates) | Compressive Strength |
|---|---|---|
| M7.5 | 1 : 4 : 8 | 1087 psi |
| M10 | 1 : 3 : 6 | 1450 psi |
| M15 | 1 : 2 : 4 | 2175 psi |
| M20 | 1 : 1.5 : 3 | 2900 psi |