CONTENTS
- Purpose
- Scope of Work
- Definitions
- References
- Materials
- Tools, Plant & Equipment
- Safety
- Prior Activities
- Procedure
- Responsibilities
- Attachments
- Purpose
1.1 To ensure that the rendering works for all the buildings are executed safely and in accordance with the contract requirements and that all quality assurance/ control activities are conducted in a systematic manner, works are inspected and conformance is verified and documented.
- Scope of Work
- This procedure is applicable to the following works associated with the Project titled, “New 2K Runway – Main Runway Works” – Contract Number NRTW-1008-CN.
- This method statement outlines the procedures to be followed in the rendering works for the buildings.
- Definitions
- CM Construction Manager
- SE Site Engineer
- CS Chief Surveyor
- ME Material Engineer
- ESHO Environmental, Safety, and Health Officer
- ITP Inspection and Testing Plan
- AHA Activity Hazard Analysis
- JHA Job Hazard Analysis
- References
- Specifications: Volume 3 – Section 9 – Part D – Architectural and
Structural
- Drawings: Volume 2 – Section 8 – Part D – Architectural and
Structural
- BOQ: Bill No. 12 – Electrical Substation 13L
Bill No. 13 – Electrical Substation 31R
Bill No. 14 – Electrical Substation ATCT
Bill No. 15 – Fire Station 13L
Bill No. 16 – Fire Station 31R
Bill No. 17 – Gate House(s)
- Materials
- Portland Cement
- Black Sand
- Dune Sand
- Curing Compound (resin based)
- D400 & F900 Covers and Frames
- Water (complying to Clause 401.4 of contract specifications)
- Galvanized Steel Render Stop Beads
- Galvanized Steel Render Movement Beads
- Galvanized Steel Render Corner Beads
- Galvanized Wire Mesh
- 18mm Marine Plywood Sub-Frame
- Rheomix 720 (Plasticizer)
- Plaxit 114 (Rush Coat) for Concrete Surface
- Tools, Plant & Equipments:
- Mechanical Mixer
- Steel Trowel
- Threads
- Hand Level
- Hammer
- Electrical Grinder Cutter
- Aluminium Tube (3m and 4m lengths)
- Electrical Drill Machine
- Bucket
- Screener
- Manual Shovel
- Scaffolding and Planks
- Tyrolean Manual Machine
- Sponge
- Personal Protective Equipment
- Safety
- Prior to the commencement of any activities, the workforce will receive an induction talk on the project site safety requirements. This induction talk will include both activity safety issues, as well as general safety requirements.
- Front line supervisor will ensure that Personal Protective Equipment is worn by site personnel at all times during construction activities.
- Heat Stress Training will be provided.
- Adequate cool drinking water, shade, and salt water tablets will be in place.
- Plant and Equipment will be provided with back-up alarms, lights, and all other applicable safety devices.
- For AOA work, safety requirements as defined per Section 107 will be implemented. Specific safety training will be provided to personnel for AOA work.
- Prior Activities
- Prior to the start of rendering works, it will be ensured that all necessary equipment and tools are available. The SE will ensure that the site staff is aware of all the procedures.
- It will be ensured that the materials for rush coat, plasticizer admixture, render corner and stop beads are approved.
- It will be ensured that the block works and MEP works are completed and approved.
- It will be ensured that the 10mm thick compressible filler board, for walls, is installed and secured properly.
- Block work walls shall be left for at least 14 days before the application of render.
- Surface irregularities, if any, shall be filled with mortar (without lime) 24 hours before rendering is commenced. Joints in block work shall be raked out before rendering to form a good key.
- Surface to be rendered shall be clean and free from dust, loose mortar and all traces of salts.
- Procedure
- Rendering to Ceiling (Uncovered Areas)
- Mix Plaxit 114, with low speed electrical drill, in a small plastic container. Leave the mixture for 5 to 10 minutes in the container before application.
- Apply the Plaxit 114 rush coat mixture directly to the concrete ceiling surface by using Tyrolean machine. Wet cure the rush coat applied surface with potable water, four to five times daily, for 48 to 72 hours.
- To ensure the horizontality and to control the level of the surface finish, fix minimum 10mm thick screed spots, at a maximum spacing of 2.50 meters in both directions, and leave to wet cure for a minimum period of 24 hours.
- Mix rendering material in a small dry mechanical mixture in proportions of one part of Portland cement to 2 parts of screened black sand, 2 parts of dune sand, sufficient potable water. The water/cement ratio should not exceed 0.42. Add air-entraining plasticizer Rheomix 720 at the rate of 150 to 250 ml per 100 kg of cement and mix thoroughly until a homogeneous mix is achieved.
- Prior to the application of rendering material, to control the water absorption of the rendering, thoroughly spray the rush coat applied concrete surfaces with potable water and leave for 5 minutes. Apply the rendering material of desired thickness to the concrete surfaces by means of trowel.
- Level the rendered surfaces properly (level control by screed spots) by using aluminium tube. After levelling, the surface shall be finished smooth by means of wood or steel float and finally finished with a dry sponge. Wet cure the rendered surfaces with potable water, three to four times daily, for 72 to 96 hours.
- Rendering to Walls
- Mix Plaxit 114, with low speed electrical drill, in a small plastic container. Leave the mixture for 5 to 10 minutes in the container before application. Apply the Plaxit 114 rush coat mixture directly to the concrete surface by using Tyrolean machine. Wet cure the rush coat applied concrete surface with potable water, four to five times daily, for 48 to 72 hours.
- For block work walls, apply a coat of rich cement/sand slurry (450 kg/m3) directly to the damped surface by means of a Tyrolean machine. Wet cure the surface with potable water, four to five times daily, for 48 to 72 hours.
- Prior to the application of render material, fix render corner beads for all exposed edges in addition to render stop and movement beads at the junction of block works and concrete surfaces and wherever shown in the approved shop drawings.
- Fix 18mm thick marine plywood sub-frame for all door openings by means of G.I. screws and plastic rowel plugs. The width of the sub-frame shall be equal to the thickness of the applied wall plus the thickness of the render on both sides.
- To ensure the verticality and to control the thickness of the rendering, fix minimum 13mm thick screed spots, at a maximum spacing of 2.50 meters in both directions, to the walls and leave to wet cure for a minimum period of 24 hours.
- Mix rendering material in a small dry mechanical mixture in proportions of one part of Portland cement to 2 parts of screened black sand, 2 parts of dune sand, sufficient potable water. The water/cement ratio should not exceed 0.42. Add air-entraining plasticizer Rheomix 720 at the rate of 150 to 250 ml per 100 kg of cement and mix thoroughly until a homogeneous mix is achieved.
- Prior to the application of rendering material, to control the water absorption of the rendering, thoroughly spray the wall surfaces with potable water and leave for 5 minutes.
- Apply the rendering material to the whole height of the wall. In areas of false ceiling, apply rendering material up to 150mm above the false ceiling level.
- Level the rendered surfaces properly (level control by screed spots) by using aluminium tube. After levelling, the surface shall be finished smooth by means of wood or steel float and finally finished with a dry sponge. Wet cure the rendered surfaces with potable water, three to four times daily, for 72 to 96 hours.
- Responsibilities
- The CM will coordinate with SE and ensure that all necessary resources to implement the approved method statement, JHA, and AHA have been allocated to the task.
- The SE will ensure that the site preparation activities are conducted according to the approved method statement, JHA and AHA. The SE will also ensure that all in-situ tests, as required by the ITP, are implemented.
- The ME will ensure that the materials being used are in accordance with the project specifications and the approved material submittals.
- It is the site supervisor’s responsibility to organize the work in a safe manner to ensure that safety and protective equipment are being properly utilized. He must also ensure that the AHA and JHA are implemented and the approved method statement procedure is followed and the ITP is applied.
