1.0 SCOPE
The intention of this method statement is to describe the procedure and
responsibilities of the personnel involved in the concrete pouring for the
protection screed.
2.0 RESPONSIBILITY
The Project Manager is overall responsible for all aspects
of the work/project.
The Project Site Engineers are responsible for the proper
execution, arrangement, coordination, and supervision of quality, safety, and
delivery of the work.
The Approved Concrete Ready Mix Supplier is responsible for
the continuous delivery of concrete as per the approved design mix and project
specifications, from batching to transporting, controlling temperature and
slump, and taking required concrete test cube samples upon arrival at the site.
The QA/QC Manager & Engineers shall ensure that the
execution team follows this method statement and implements the site inspection
procedures. The QA/QC Engineers shall monitor, check, control, and document the
quality of concrete delivered to the site and the quality of work throughout
the entire casting process.
The Safety Engineer or Safety Officer will ensure the
implementation of safety measures at the worksite.
3.0 MATERIALS & EQUIPMENT
The concrete design mix for the protection screed should be
approved by the engineers before execution.
Polyethylene sheets should be approved by the engineers or
as recommended by the waterproofing manufacturer/supplier.
Secured approved shop drawings for raft foundation lift
pits, manholes, etc., should be available for reference of screed levels.
4.0 EXECUTION
Inspection of completed layers of liquid damp proofing
materials should be carried out to ensure no damage or unsatisfactory
workmanship.
Install the approved gauge of polyethylene sheets as per the
method statement of the waterproofing manufacturer/supplier.
Proceed with concreting the protection screed to the
required thickness (minimum 50 mm) after rectifying any unsatisfactory
conditions.
5.0 PREPARATION
Clean and prepare the applied bituminous damp-proof surface
according to the manufacturer/supplier's recommendations on blinding.
Remove all dirt, deleterious materials, and other substances
that may damage the waterproofing during the concrete pouring process.
Establish the reference elevation of 1.0 meter from SSL and
the high-level elevation of the concrete protection screed as per the approved
shop drawing and specification.
Install approved polyethylene sheets on top of the applied
damp-proofing, as per the manufacturer's/supplier's method statement.
Install the forms along the construction joints of the
protection screed.
Obtain approval from the engineers before the application or
placement of concrete.
6.0 APPLICATION
Determine the weather conditions (hot, sandstorm, rainy, or
sunny) before placing the concrete order with the ready-mix supplier.
Sprinkle clean water on top of the polyethylene sheet to
promote bonding with the concrete.
When the ready-mix concrete arrives, inform the engineers
and conduct QC testing, such as slump test, temperature check, and volume at
the concrete checkpoint.
Use high slump or self-compacting ready-mix concrete to
avoid using a vibrator, which could cause misalignment of the polyethylene
sheet.
Place the ready-mix concrete using a concrete mobile pump or
direct pouring with a chute, following the basic method statement for placing
concrete using a concrete mobile pump or direct pouring.
Once the ready-mix concrete is placed, level the concrete
according to the approved screed level.
Finish the screed surface as required, according to the
specification or as approved by the engineers.
Once the initial set of the concrete is complete,
immediately apply an approved curing compound or use water curing to prevent
thermal cracking.
7.0 FIELD QUALITY CONTROL
Monitor the temperature and slump of ready-mix concrete.
Ensure the quality of the delivered ready-mix concrete at
the site.
Ensure that concrete cube sampling is conducted as per the
specifications.
Ensure quality workmanship and required thickness during the
pouring activity.
8.0 SAFETY PRECAUTIONS
Prime importance shall be given to the safety of personnel
and the protection of utility services. Ensure that personnel involved are
thoroughly aware of the company’s safety regulations.
Any machinery and equipment must be operated only by
well-trained and experienced personnel.
Protective clothing and equipment will be necessary. Ensure
that any special protective clothing or equipment required, such as helmets,
eye protection, ear defenders, visibility vests, etc., is ordered and available
for use on-site. Subcontractors should be made aware of any site requirements,
especially regarding safety helmets.
Instruct staff in the correct handling and lifting of
materials, as improper handling could cause injuries to the hands.
A risk assessment letter should be issued by the Safety
In-charge before the start of the activity and posted at the working area
during the activity.
9.0 REFERENCE DOCUMENTS
Project contract specifications
Project contract drawings and general notes
