Table of Contents
- 1 How do I prepare for a slab?
- 2 What is the procedure for inspection on a slab?
- 3 Do you need gravel under concrete?
- 4 How do you set a concrete slab?
- 5 What is pre slab?
- 6 How would you treat formwork before and after concrete is cast?
- 7 What are the precautions to be taken while designing a slab?
- 8 How to prevent plastic shrinkage crack in concrete slab?
How do I prepare for a slab?
To shore up the subsurface, sprinkle a thin layer of cement sand onto the gravel and dampen it with water. Do not leave any standing water and allow the dampened sand to dry for about an hour before pouring the concrete. Ground preparation is key to pouring sidewalk, driveway or any other concrete slab.
What is slab procedure?
The concrete slab construction process includes the preparation of formwork, compaction of a slab bed, placement of reinforcement, pouring, compacting, finishing the concrete, removing formwork and curing the concrete slab.
What is the procedure for inspection on a slab?
Inspection AFTER the Concrete Slab is Poured
- The slab is in accordance with the floor plan for your new home.
- There is no reinforcement protruding from the slab.
- The slab is straight and level.
- If termite barrier has been installed that it has been done correctly.
- There are no service cracks in the slab.
What are the pre checks before pouring of concrete?
1. Concrete Pre-Placement Checklist
| Sl. No | CHECKLIST | REQUIREMENT |
|---|---|---|
| 1 | Centre line | As per drawing |
| 2 | Formwork & Staging | As per drawing & in exact plum |
| 3 | Construction joint location* | As per drawing |
| 4 | Steel reinforcement diameter / spacing & coating* | As per drawing |
Do you need gravel under concrete?
Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.
How do you calculate concrete for a slab?
How to calculate concrete:
- Determine how thick you want the concrete.
- Measure the length and width that you’d like to cover.
- Multiply the length by the width to determine square footage.
- Convert the thickness from inches to feet.
- Multiply the thickness in feet by the square footage to determine cubic feet.
How do you set a concrete slab?
HOW TO LAY A SLAB USING CONCRETE MIX
- CONSTRUCT THE FORMWORK.
- MEASURE THE AREA TO BE DUG OUT.
- EXCAVATING THE AREA FOR THE CONCRETE SLAB.
- PREPARING THE SLAB BEDDING.
- PLACE THE REINFORCING MESH (IF REQUIRED)
- MIXING THE CONCRETE.
- PLACING THE SLAB.
- FINISHING THE CONCRETE SLAB SURFACE.
What do concrete inspectors look for?
Inspectors verify that the correct type of concrete is used and that is it poured to the right depth. They also check the mix of concrete being used, what reinforcements are necessary, and how weather conditions affected the work, such as the way the concrete cured.
What is pre slab?
What is a Pre-Slab Inspection? Our pre-slab inspection is carried out on your home base before concrete is poured. This is done to ensure everything is primed and ready for the installation of concrete.
What should be paid attention to before and during concrete pouring?
Concrete Setting Time : It is required to pay attention to the initial and final setting times during the concrete pouring. In general, the initial setting time of concrete is around 45-60 minutes. However, it can be modified by adding admixtures.
How would you treat formwork before and after concrete is cast?
All formwork surfaces in contact with concrete need to be treated with shuttering oil and dampen with water sometime prior to concrete placement. check the level of the projected top surface of the slab and place level strips if necessary to mark the exact level.
How to check the formwork of concrete slab?
Check the Slope and level of formwork of each slab panel. Shuttering oil shall be used on shuttering plates in order to remove the formwork after concrete gets strength. Check the diagonal of slab formworks. Check that vertical formwork shall be used along all the edges of the slab, staircase void, internal voids, etc.
What are the precautions to be taken while designing a slab?
The size of the formwork of each slab panel must be checked as per Approved drawings. Check the Slope and level of formwork of each slab panel. Shuttering oil shall be used on shuttering plates in order to remove the formwork after concrete gets strength. Check the diagonal of slab formworks.
What are the general Checklist of formwork?
General Checklist of formwork 1 Formwork plates shall be uniform in the surface. Uneven surface in the shuttering board shall not be allowed. 2 Wooden shuttering shall be properly cleaned and free form concrete particles if it is used formwork 3 The shuttering plate shall be rigid, firm, and durable so that it can carry movement load.
How to prevent plastic shrinkage crack in concrete slab?
In case of concreting in rainy, windy, or extremely hot weather, put a cover of tarpaulin over the slab. It will protect the slab from getting damaged. 12. To prevent plastic shrinkage cracks in the concrete slab, avoid drastic drying of green concrete.