Method Statement for Concrete Topping (Ramp Slab)

METHOD STATEMENT FOR CONCRETE TOPPING & SANDCEMENT SCREED Scope: This methodology covers the preparation and placement of a concrete topping and sand-cement screed mix on structural slab surface in preparation for final floor finish and to correct undulated and out of tolerance slab elevations. The following table shall be used to classify the material and method to be used for corresponding slab thickness ranges: Slab Thickness Range 5-65 mm 66-100 mm

Type of Material Sand-Cement Screed 3000 Psi Concrete Topping with diameter 10 rebar drilled on slab

*Note: Maximum topping to be poured is 100mm.

Materials: 1. 2. 3. 4.

Concrete Topping / Sand Cement Screed Mix Diameter 10 Rebar Concrete Epoxy Concrete Curing Compound

Tools/Equipments: 1. Concrete Mixer 2. Concrete Vibrator 3. Screeding Tools Manpower: 1. Mason 2. Carpenter Procedure: 1. 2. 3. 4.

Clearing / cleaning of the area. Remove concrete laitance / loose concrete. Establish finish elevation markings. Prepare guide buttons on floor in accordance with the required topping elevation. Make sure the thickness of finish is considered on the guide buttons. 5. Drill diameter 10 rebar on slab with 300mm spacing o.c. 6. Dampen the concrete slab with water for 24 hours to saturate it.

7. Mix grout mixture to a ratio of 1 bags of cement to 1.5 cu.ft. sand with sufficient amount of water to attain consistency of a thick paint. 8. Apply the grout to the concrete surface in segment keeping short distance ahead of the concrete topping or sand-cement screed placing operation that follows it. 9. If the slab thickness is 25 mm and below prepare a mixture of 3000 Psi at 28 days sand-cement screed using the following volumetric proportion: Water Cement Fine Aggregates

21 liters 1 bag 3 cu.ft.

10. If the slab thickness is 25mm and above, prepare a mixture of 3000 Psi at 28 days concrete topping using the following volumetric proportion: Water Cement Fine Aggregates 3/8 Coarse Aggregates Admixture

21 liters 1 bag 3 cu.ft. 3 cu.ft. 0.4 liters

11. Apply the concrete topping or sand-cement screed to the required depth. Make sure that the concrete topping or sand-cement screed is evenly applied and vibrated sufficiently before finishing operation takes place. 12. Level the surface to the desired finish. 13. Curing of concrete must be maintained within 48hours using water. Health and Safety: 1. Use proper PPE during conduct of work. 2. Avoid direct contact with concrete & sand-cement screed material. 3. Utilized the concrete mixing, hauling and vibrating equipment in accordance with the manufacturers’ instruction.