Table of Contents
How big of a slab do I need?
Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks.
How do you check slab level before casting?
Checking of Concrete Slab Check the reinforcement and get an approval from your RCC consultant. Check the standby arrangements made for water in case of power failure. Consult your RCC consultant before you decide the position of concrete joints in case of a big slab. Ensure that wooden pieces, paper, nails, etc.
How can you tell one way and two way slab?
If L/b the ratio is greater than or equal 2 or then it is considered a one-way slab. If L/b the ratio is less than 2 then it is considered a two-way slab. In one-way slab, the load is carried in one direction perpendicular to the supporting beam. In two-way slab, the load is carried in both directions.
How do you calculate the overall depth of a slab?
Effective depth d= Span /((L/d)Basic x modification factor)…Or, the following thumb rules can be used:
- One way slab d=(L/22) to (L/28).
- Two way simply supported slab d=(L/20) to (L/30)
- Two way restrained slab d=(L/30) to (L/32)
How do you calculate the modification factor of a slab?
Effective depth d= Span /((L/d)Basic x modification factor) For obtaining modification factor, the percentage of steel for slab can be assumed from 0.2 to 0.5\%. The effective depth d of two way slabs can also be assumed using cl. 24.1,IS 456 provided short span is 3.5m and loading class is <3.5KN/m2.
How do you measure the strength of a concrete slab?
Step 1 – Find out the no. Of bars and their dimensions in one meter span of slab in shorter direction. Step 2 – Find out the grade of concrete. Step 3 – Using the IS 456 page 90 formula, calculate the area of steel present in tension and the thickness of slab and thereafter find the moment of resistance of slab.
How strong is 4 inches of concrete?
A concrete patio slab should be at least 4 inches thick and have a compressive strength of 3,000 PSI.
How do I know if my concrete slab is level?
You want to measure any gaps between the surface and the level. And if it’s less than 1/8 of an inch, it’s considered level. Larger gaps will require more pouring or some other type of adjustment. Mark these areas with a felt-tipped marker, and repeat the process until the entire area has been measured.
What should I check before pouring concrete?
Inspection during Placement of Concrete….1. Concrete Pre-Placement Checklist.
| Sl. No | CHECKLIST | REQUIREMENT |
|---|---|---|
| 10 | Location of construction joint | |
| 11 | Water tightness of shuttering, if required | No water seepage allowed |
| 12 | Quality of water | Potable and clean |
| 13 | Measuring jar for water pouring | As per water content requirement |
What are the design procedures for a slab system?
ACI318 Code provides two design procedures for slab systems: 13.6.1 Direct Design Method (DDM) For slab systems with or without beams loaded only by gravity loads and having a fairly regular layout meeting the following conditions: 13.6.1.1 There must be three or more spans in each directions.
What is load calculation on columns beam and slab?
The total Load Calculation on Columns, Beam, Slab we must know about various loads coming on the column. Generally, the Column, Beam, and Slab arrangement are seen in a frame type of structure. In the frame structure, the load is transferred slab to beam, beam to column and ultimately it reached the foundation of the building.
What is the minimum thickness of a slab in construction?
But slab minimum thickness is specified for normal construction around 125 mm. Generally, every slab is supported by a beam, column, and wall around it. Besides this above loading, the columns are also subjected to bending moments that have to be considered in the final design.
What is the slab load per square meter of a building?
= 0.125 x 1 x 2400 = 300 kg which is equivalent to 3 kN. Now, If we consider the Finishing load to be 1 kN per meter and superimposed live load to be 2 kN per meter. So, from the above data, we can estimate the slab load to be around 6 to 7 kN per square meter.