The purpose of this concreting method statement is to define the guidelines for the preparation of the concreting work for pedestrian walkway (broom finish) and to ensure the safe execution of all the concrete works during construction phases of the project so as to eliminate the risk of injury or damage to personnel, equipment and property.
Method statement document outlines the method on how to execute the broom finish concrete work including concreting, reinforce bars and formworks according to the requirement and standard code of practice for construction. In addition, it also covers the requirements for general concreting works including materials, mixing, formworks, reinforcement steel bar, curing, testing and other related requirement for concreting work of broom finish walkways.
Material Machinery & Other Resources
The following list of materials shall be deployed to the site for the broom finishes work:
• Concrete
• Spacer block
• Reinforcement steel bar/BRC Sheet
• Steel wire to tie reinforcement bars
• Plywood and timber
• Curing compound (If necessary)
• Expansion joint
The following list of machinery shall be deployed to the site for the concrete works:
• Backhoe
• Concrete vibrator
• Concrete pump (if required)
• Hand tools
• Bar cutter & bar bending machine
• Formwork
• Submersible pump (if required)
• Generator
• Air blower
• Concrete broom
The following labor resources shall be deployed to the site for the concrete works:
• Backhoe operator
• Site Engineer
• Site supervisor
• QA/QC inspector
• Land surveyor
• Safety officer
• General workers
• Skilled workers
Roles & Responsibilities
Overall contractor company is responsible for ensuring that work activities are conducted safely and that personnel are not placed at risk from the hazards associated with the activities covered by this method statement. Specific responsibilities are as below:
Project Manager
Exercise overall responsibility for HSE protection, including work for which a Permit To Work (PTW) and a Confined Space Permit have been issued.
Authorize Permit Requester’s in writing and confirm that they are appropriately go through PTW training.
Responsible for the management of the site activities including the effective application of the quality system.
Liaisons and corresponding with the Consultant’s Representative, Engineers, Local Authorities, Sub-subcontractor and Supplier to ensure that the works are carried out as per contractual requirements.
Monitoring and ensuring the Project is progressively positively in aspects of cash flow, cost quality and timely completion.
HSE Engineer/Officer
Exercise overall responsibility for HSE protection.
Manage the overall safety, health and environment activities in the project organization.
Responsible for planning, formulating and enforcing safety policies and regulations.
To identify variances and take correction actions to protect personnel and property against accidents.
Advise management on all Occupation Safety & Health (OSH) matters.
Construction Manager
Control of the daily operation of the construction activities on site.
Overall planning and oversees the implementation of the works program over particular sections of the project;
Ensure implementation of the work procedures and relevant method statements.
QA/QC Engineer
Implement, monitor and verify that all construction operations are being conducted in accordance with the established quality procedures.
Monitor and review non-conformance and corrective actions, maintain records and ensure the corrective actions are followed and complied.
Responsible to ensure that only qualified and competent person are working on the project activities in order to deliver project successfully.
Carry out inspection on site activities to ensure accordance with the IFC drawings and project specifications.
Managing and witnessing material sampling, performance tests and inspections if required.
Site Engineer
Responsible for material management & engineering coordination.
Checking and clarifying discrepancies in drawing well before work is carried out.
Managing and witnessing material sampling, performance tests and inspections if required.
Advising on technical matters.
Surveyor
Carry out all land surveying works on site which includes plotting, protect and transfer of control points.
Responsible for setting out including identifying discrepancies in drawings.
Responsible for recording and maintaining all survey data and joint surveys.
Ensuring all equipment is calibrated and safe keeping of all survey instrument and equipment.
Cross checking the data / computation for as-built data.
Site Supervisor
Organize and supervise the duties of supervisors on site.
Issuing the RFI for construction works to be acknowledged by Quality Department.
Checking work to eliminate mistakes and abortive works;
Supervising and coordinating works among subcontractors.
Work Procedure for Broom Finish Concrete
Survey and setting out works shall be conducted to provide the existing slab levels and alignment.
The designated walkway area shall be removed with allowance for thickness of lean concrete, crusher run and concrete slab.
Excavation work to be proceeded upon completed hacking / removed existing walkway slab. Excavation work to be executed by use of manpower i.e. manually.
Concrete Pedestrian Walkway Construction
The construction of concrete walkway will commence as soon as excavation work accepted by Consultant.
As excavation reaches the required depth, the surface shall be leveled and shall be compacted by use of plate compactor to prevent settlement.
Before the compaction starts, make sure that the excavated level is free from standing water or excessive moisture content.
Built the formwork to the side of concrete walkway slab and support by timber bracing to prevent formwork collapse.
Lean concrete to be poured when side formwork has been completed and space block are placed before BRC sheet been laid. BRC sheet should be bent and cut into required length and tied inside the formwork.
Make sure the BRC sheet is placed properly on spacer blocks avoid touching the lean concrete below.
The BRC sheet shall be clean free from loose mill scale, loose rust, oil or other coating which is liable to weaken bond between the concrete and steel, before being placed in the formwork.
Placing and bending of hooks, anchors, bars, clearance, laps and splices shall be in accordance with the requirement of BS 4449 or MS 146.
Before concrete placing, all the formwork support and bracing shall be checked and tightened properly and cleaning of the debris to be done, formwork from inside should be in order and well maintained.
Concrete to be pour directly from concrete truck. Place the concrete as close to its final destination as possible to avoid segregation.
Spread, screed, vibrate the concrete so that it completely fills all the space/gap inside the formwork.
Using wood float, start float the concrete to the desired level and flatness before the appearance of excess moisture.
Keep the surface open until bleed water is coming out of the matrix and the surface becomes saturated dry.
After floating and the surface become hardened sufficiently, start troweling using steel trowels in constant medium pressure to ensure uniformity of the surface.
Groove line to be insert according to the specification and drawing with 6mm rebar. Remove the rebar before the concrete hardens.
Expansion joint UPVC model 30EXJ-9 to be provided at every (6) meter or as per drawings.
Broom the surface by pulling the broom towards oneself by edge to edge and repeating each pass with a slight overlap.
Keep the texture perpendicular to the traffic direction. Once finished brooming, go over the corners and control joint.
Formwork shall be dismantled and removed from the cast of concrete without shock, disturbance and damage.
Concrete Sampling & Testing
Samples of concrete for tests shall be taken for making cubes as and when directed by the Consultant.
The concrete compressive strength test shall be carried out for 7 days, 14 days and 28 days or as directed by Consultant.
Number of cubes may be reduced if consistently satisfactory results are obtained, or increased up to a maximum of 16 when, in the opinion of the consultant additional tests are required as, for example, in the early stages of the work.
Test cubes shall be made, cured and stored under the same conditions as the works to which they relate and shall be transported and tested in accordance with BS EN 12390-1.
Reports of all tests certificates shall be submitted to the Consultant within 24 hours after testing to close the Request For Inspection (RFI).
The concrete cube test record shall be used to record the cube test information and also summary cubes crushing test will record the results on the test cube conducted.
Concrete Cubes Preparation
Nine (9) cubes shall be made in each batch of sample taken. Total cubes for each testing (7 days, 14 days and 28 days) shall be determined by the Consultant.
Every test cube shall be clearly and permanently marked with its code number and date of casting together with an indication of the part of the works to which it relates.
The system of identifying and marking the cubes shall be decided by the Consultant.
A record of such tests identifying the test cubes with the part of the work executed shall be kept at the site and made available to the Consultant on request.
Slump Test of Concrete
Slump test shall be done in every batch / load of concrete supply.
The slump tolerance shall be within the range specified in the design mix concrete.
Slump to be ensured within the design slump as indicated in design mix to prevent honeycombing.
In case of failed slump test, the load of concrete supply shall be rejected as it may have adverse impact to durability of completed concrete structure.
Curing and Protection
Concrete shall be protected during the first stage of hardening from the harmful effects of sunshine, drying winds, rain or running water.
The protection shall be applied as soon as practicable after completion of placing concrete by one or more the following methods:
a. The concrete shall be covered with a layer of sacking canvas, hessian, straw mats, or similar absorbent material, or a layer of sand, kept constantly wet for 7 days;
b. After thoroughly wetting, the concrete shall be covered with a layer of approved water proof paper or plastic membrane kept in contact with the concrete for 7 days;
c. The concrete shall be cured by application of an approved liquid curing membrane which shall be applied immediately after placing the concrete during the initial set stage and on vertical surfaces after removing the formwork.
The application of curing compound shall follow the instruction provided by the manufacturer.
Concrete Quality Control Inspections
PRE-CONCRETING INSPECTION
Prior to concrete pouring, inspection as per the pre-concrete inspection checklist shall be carried out and approved by Consultant.
Contractor’s Quality Team shall ensure all the formworks and reinforcements are installed accordance to the requirements specified in the project specifications and/or standard code of practice before commencement of concreting works.
Concrete vibrator shall be in standby mode and available during concrete pouring.
In addition, Contractor shall ensure all the formwork support and bracing to be checked and tightened properly.
Except otherwise directed, concrete shall not be placed unless the Consultant is present and has previously examined and approved the positioning, fixing and condition of the reinforcement and of any other items to be embedded and the cleanliness, alignment and suitability of the containing surfaces.
Quality Control While Pouring Concrete
The temperature of the concrete shall be taken and recorded in the Concrete Pour Card.
No concrete having an internal temperature exceeding 33°C shall be deposited and the concrete shall not shall not be placed in formwork or around reinforcement whose temperature exceeds 36°C.
Slump test shall be carried out in accordance with BS EN12350-2 and shall not be less than 50mm. The slump tolerance shall be within the range specified in the design mix concrete. Concrete which has a slump of less than 50mm (2 in) will be rejected.
The concrete shall be deposited as nearly as possible in its final position, working from the top end, if any. It shall be placed in such manner as to avoid segregation of the concrete or displacement of the reinforcement, other embedded items or formwork.
All concrete shall be fully compacted by continuous vibration throughout the full extent of the layer before the initial set has taken place and shall not be subsequently disturbed. It shall be thoroughly worked against the formwork and around any reinforcement and other embedded items without displacing them.
The concrete cube sample should, where applicable, be taken at the point of discharge from the mixer in the case of ready-mixed concrete.
Post Concrete Defect Handling
Where the defect is detected during post concreting, the concrete repairing work shall be carried out after post concreting inspection.
The defect like cracks and honeycomb shall be repaired using non-shrink grout cement or epoxy grouting.
Health Safety & Environmental Requirements
The following key areas of construction shall be adhered by all site personal working on site.
Personnel Protective Equipment
The personnel protective equipment (PPE) will be provided to the workers onsite that includes the following:
– Safety helmets (hard hat)
– Safety vest
– Safety boots
– Safety glasses
– Dust mask
– Working gloves (if necessary)
– Ear plugs (if necessary)
House Keeping
Housekeeping is an essential part of safety for the daily routine. Housekeeping would include the following items:
– Maintain access / egress to all working area.
– Store and stack all construction materials in safe and orderly manner.
– Avoid littering around the jobsite.
Environment Issues
Temporary drains / sediment pond / silt fence will be constructed and maintained throughout construction periods to ensure compliance to the legal requirement.
Water bowser will be deployed at site to control the dusty surfaces by spraying the water.
In order to achieve safe, risk free and healthy working environment including loss prevention, every practicable step must be taken by each and everyone employee engaged in the project site.
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