Common Mistakes In Concrete Floor Slab Construction

By: Global Associates
KOLKATA, India - Dec. 20, 2020 - PRLog -- Given below some useful tips for concrete floor slab construction.

Floor Slab Thickness

• In any residential construction, the typical floor slab thickness should be 4 inches. In case of greater load, five to six inches should be retained.

Ground Floor Slab Construction

• To develop the base, cut the ground level into the proper depth to adjust the concrete slab thickness. Remove all sorts of organic material & large hard objects like stones & tree roots to a depth of a minimum of 4 inches.
• To construct the grade, use gravel or sandy soil & compact the final base with a vibratory plate or equivalent device. The edge forms should contain any straight material that should be fixed into position.
• In case, the straight lumber is not accessible, plastic or metal forms can be used in place of it. Prior to arranging the formwork, a string line should be set with grade stakes or batter boards to retain a square, level reference.

Concrete Mix For Floor Slab

• The concrete mix for the floor slab should satisfy the compressive strength requirements. As water increases shrinkage and cracking, a plasticizer should be used. Use fibers to avoid plastic shrinkage cracking. Keep greater strength & entrained air for exterior slabs that are uncovered to freezing weather or deicing chemicals.
• Refrain from using extra water at the jobsite exceeding 1 to 2 gallons per cubic yard.
• Allocate the concrete around the slab area as close to its final position as possible, and then rake it into position. To consolidate low-slump mixes, a handheld vibrator or a vibratory screed should be used.
• The control joints should be formed no farther apart than 24 to 30 times the slab thickness and under no circumstances exceeding 15 feet along both the width and length of the slab by pushing a 1-inch deep grooving tool into the surface.
• If the joint spacing surpasses 15 feet, the dowels or dowel plates should be utilized. For slabs with long joint spacing or no joints, steel reinforcement is necessary.

Curing Concrete Floor Slab

• There should be exact curing conditions and the curing method should be set up once the finished surface can control the damage.
• A curing compound should be provided over the surface, or proper moist curing should be retained.
• In case of freezing, the slab ( should be wrapped with an insulator, like insulating blankets or a 4-inch-thick layer of straw that is weighted down so that it can't wipe out.
• The insulator should be kept in the proper position unless the concrete attains a minimum strength of 500 psi. It generally happens within a few days.

Rajib Dey
Tags:Concrete Floor Slab
Location:Kolkata - West Bengal - India
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