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METHOD STATEMENT FOR CONCRETE WORK

Er. Parbhakar Dwivedi
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Reference

The following reference shall be used in conjunction with this procedure

  • Technical Specifications
  • IS Codes : IS 10262, IS 456
  • Drawings
  • BOQ

Resources Used

A. Manpower

  • Skilled Labour
  • Unskilled Labour

B. Machinery

  • Cranes
  • Concrete Pumps & Boom placers
  • Vibrators (Mechanical / Electrical)
  • Batching plant
  • Mixer machine

Safety Points

  • All personal involved with the reinforced concreting works will at all times be fully attired with the appropriate Personal Protective Equipment (PPE) in compliance with Site Regulations.
  • The concrete pump crane and all other equipment operators need to be competent in the operation of the plant. All operators will be constantly alert to follow all instructions given therein.

Work Procedure

Mix Design and Proportioning

  • Mix proportions shall be designed to ensure that the workability of fresh concrete is suitable for conditions of handling and placing, so that after compaction it surrounds all reinforcement and completely fills the formwork. When concrete is hardened, it shall have the stipulated strength, durability and impermeability. Determination of the proportions by weight of cement, aggregates and water shall be based on design of the mix.

Placing of Concrete

  • Concrete will be supplied from batching plants and delivered to site by Transit Mixture.
  • Concrete will be pre-ordered in advance of the pour, and then confirmed on the day of the pour with the delivery time, quantity and grade.
  • Prior to concreting a pre-pour inspection will be carried out to check cleanliness, reinforcement steel, formwork, cast in items and dimensions.
  • The construction sequences for reinforced concrete structures will be determined for each structure. Pour sequences and construction joint layout will be submitted separately as required.
  • Methods may be used to place concrete depending on access, volume of pour, conditions at the time and the structure being poured.
  • Direct discharge from the truck. (Maximum permissible free fall of concrete is 1.5mts).
  • Using a static or truck mounted concrete pump.
  • Concrete will be placed in a controlled manner and rate to ensure that undue pressure is not exerted on the shutters and that cold joint do not form.
  • Testing to be conducted on concrete in Site Lab.
  • Once placed concrete shall be compacted using electric or motor driven vibratory pokers of a size comparable to the pour (either 40, 60 or 75 mm) and the amount of access. Spare vibrators shall be available in the event of a breakdown.
  • Concreting shall be commenced only after Engineer-in-Charge has inspected the centering, shuttering and reinforcement as placed and passed the same and adhere pour card. Shuttering shall be clean and free from all saw dust, pieces of wood, or other foreign material and surfaces shall be treated as prescribed.
  • During cold weather, concreting shall not be done when the temperature falls below 4.5ºC. The concrete placed shall be protected against frost by suitable covering.
  • During hot weather precaution shall be taken to see that the temperature of wet concrete does not exceed 38ºC.
  • Concrete shall be judged to be properly compacted, when the mortar fills the spaces between the coarse aggregate and begins to cream up to form an even surface. When this condition has been attained, the vibrator shall be stopped.

Construction joints

  • Concreting shall be carried out continuously up to the construction joints, the position and details of which shall be as shown in structural drawing. Number of such joints shall be kept to minimum. The joints shall be kept at places where the shear force is the minimum. These shall be straight and shall be at right angles to the direction of main reinforcement. Construction joints should comply with IS: 11817.
  • In case of columns the joints shall be horizontal and 10 to 15 cm below the bottom of the beam running into the column head. The portion of the column between the stepping off level and the top of the slab shall be concreted with the beam.
  • When stopping the concrete on a vertical plane in slabs and beams, and approved stop board shall be placed with necessary slots for reinforcement bars or any other obstruction to pass the bars freely without bending. The construction joints shall be keyed by providing a triangular or trapezoidal fillet nailed on the stop board. Inclined or feather joints shall not be permitted. Any concrete flowing through the joints of stop board shall be removed soon after the initial set. When concrete is stopped on a horizontal plane, the surface shall be roughened and cleaned after the initial set.
  • When the work has to be resumed, the joint shall be thoroughly cleaned with wire brush and loose particles removed. A coat of neat cement slurry at the rate of 2.75 kg of cement per square meter shall then be applied on the roughened surface before fresh concrete is laid or Fosroc Nitobond as per the Engineer-In-Charge.

Concrete Pour Card

Project Name: Pour Card No.
1. POUR LOCATION & DESCRIPTION

2. REFERENCE DRAWINGS

* GA Drwg. No/Rev.:

*RC Drwg. No/Rev.:

3. DETAILS
* Planned Start(Date/Time): Placing Method:
* Concrete Grade: Placing Rate:
* Volume (m3): Target Slump(mm): Curing Method:
4. PRE-POUR CHECKS

(* -Enter NA for Non Applicable items, ** As required by the Contract)

Item Checklist Remarks
Form Work
Dimension, level and plumb

Tightness and rigidity

Cleanliness and release agent
 

 

 
Reinforcement
Bar size, shape and no.

Cover, Laps and Anchorage

Measurements completed
 

 

 
General
Embedded Items

Quality of ingredients

Expansion joint provision

Joint preparation with existing concrete
 

 

 

 
5. POUR RECORD
* Planned Start(Date/Time): Placing Method:
* Workability Results Satisfactory: Cubes Taken(No.):
* Weather Conditions: Curing Method and Period:
* Any Problems/delays:

6. POST POUR CHECKS
* Formwork stripping achieved for Stop Ends/Sides/Soffit:

(in Days)

* Surface finish satisfactory
* Curing/Protection
* Embedded in items
* Cube results satisfactory:
* Any required remedial work:

* Concrete pour completed correctly

Sign:

Site Engineer
MEP Engineer
Safety Engineer
QA/QC Engineer

Finishing

  • In case of roof slabs the top surface shall be finished even and smooth with wooden trowel, before the concrete begins to set & shear key has to be provided in columns and shear walls.

Curing

  • The surface shall be cured by ponding of water. The period of curing shall not be less than 10 days for concrete exposed to dry and hot weather conditions.

Testing of Concrete

Regular mandatory tests on the workability of the fresh concrete shall be done to achieve the specified compressive strength of concrete.

  • Cube Test for Compressive Strength of Concrete for 7 days and 28 days as per Material Test Plan
  • Slump Test : This test shall be carried out as per Material Test Plan
  • For Material test like Cement,Flyash,20mm,10mm,Sand,water and admixtures etc. Material Test Plan to be followed.

Visual Inspection Test:The concrete will be inspected after removal of the form work.

The concrete will be inspected after removal of the form work.

Precautions

  • The levels/plumbs should be checked after casting of Concrete.
  • After completion work should be protected against entry of men until Concrete harden.
  • Shear key has to be provided in columns and shear walls.

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