Method Statement for Road and Paving Works:
Scope:
This method statement describes the activities and process of Road and paving work for School Project works include preparation, installation and protection as per the project requirement.
The purpose of this method statement is to conduct a systematic work execution for the Road and paving work for that will produce and deliver a safe execution procedure in accordance with the approved Standards/Specifications and Lifting procedure.
It is the Policy of "Company Name" to provide a safe and healthy place of employment. In areas where scaffolding is to be erected, dismantled, altered, moved or accessed for any purpose, the following procedure shall be utilized.
Activities:
Road and paving work will comprise the following activities
- Sampling and storage.
- Aggregate road base.
- Projection.
- Asphalt / Bituminous works.
Purpose:
The purpose of this document is to ensure that the standards and specification of the School Project and that of "Company Name" is effectively implemented during the process of Road and paving work. This method statement provides the necessary support to the team with relevant information regarding the specific project requirement and a guideline for a procedure to work safely.
Communication:
The contents of this method statement shall be explained and demonstrated to all involved personnel based on specific task allocation. Site Engineer / Supervisor, subcontractors’ signatures shall be taken on the approved method statement as a matter of record. Daily (at the start of each shift) the Works Supervisor and HSEO will complete a Pre-works briefing with ALL labor based on the activities to be complete in the shift (pre-works briefing will be signed by ALL labor to demonstrate that they have understood the activities and associated controls. They will then complete a site walk to ensure and verify that all the controls are in place. Both the RAMS and Pre-works briefing will be located on site with the Works Supervisor for reference and review.
Construction Methodology:
1. Sampling and Storage:
• Subgrade samples for Soil classification, laboratory moisture density relationship tests and CBR tests shall be taken prior to use, from any proposed source of material.
• Each sample shall represent not more than 3,000 Cu.m of stockpiled material.
• A dry density moisture content relationship test shall be made for each type of soil to be used in the construction of the work to determine the Maximum Dry Density, the Optimum Moisture Content and the Moisture Range required of the soil for satisfactory compaction
• Sub-Base One sample every 3000-cu m of stockpiled material shall be tested for Grading, Plasticity Index, Maximum Dry Density, and Los Angeles Abrasion.
• Aggregate Road-base one sample every 3000-cu m of stockpile material or part of as directed by the consultant shall be tested for Grading, Plasticity Index, Maximum Dry Density, and Los Angeles Abrasion.
• The all test shall be performed as per project specification and applicable code.
• All stockpile shall be approved prior to proceed the works.
• MIR / reports shall be submitted along with relevant documents prior to proceeding.
2. Excavation for Road Construction:
• Common Excavation shall consist of the excavation and satisfactory disposal of all soils, certain strata, and individual rock boulders less than 1 cubic meter in volume as instructed by the Engineer. Strata which are altered and weathered and are in place, but which are not firm enough, or in the opinion of the Engineer are not rigid enough to have all the characteristics of rock excavation shall be classified as common excavation.
• Rock Excavation shall consist of the excavation and satisfactory disposal of all unaltered and un weathered firm and rigid igneous, metamorphic, and sedimentary solid rock and boulders exceeding one cubic meter in volume that in the opinion of the Engineer are impracticable to remove by heavy mechanical excavating equipment or by heavy duty hydraulic ripper, or by approved pneumatic tools.
• Roadway excavation shall be sub classified as Common Excavation and Rock Excavation.
• All material removed from an excavation shall be used in the formation of the embankment, shoulders and at such other places in storage yard.
• No excavated material shall be disposed without written permission from the consultant and clients.
3. Subgrade – Roads:
• Excavation shall be for the full construction width down to subgrade level. For a further depth of 15 cm the existing material shall be scarified, watered as necessary, mixed and compacted to not less than 95% of maximum dry density.
• Fill and embankments, an 'improved subgrade layer', using specified material in accordance with project specification.
• The improved subgrade layer shall be compacted to not less than 95% maximum dry density.
• CBR of the subgrade is satisfying the minimum requirements, a further depth of 15cm of the existing subgrade shall be scarified, watered, mixed as necessary and compacted to not less than 95% of maximum dry density.
• All slopes, lines and grades shall be true, correct and accurate, and according to latest approved shop Drawings.
• The subgrade level in cuts shall be accurate to the authorized profile grade to plus or minus two (2) centimeters and, for 'top of improved subgrade' level, plus or minus one (1) centimeter.
• During the construction of the roadway, the prepared formation shall be maintained in such condition that it is well drained at all times.
• The material for improved subgrade shall be approved soil with a plasticity index not exceeding 6 and liquid limit shall not exceed 40%.
• Dune sand if used shall not contain more than 2% organic matter and may contain up to 20% of stone fragments or cobbles exceeding 20mm but not more than 63mm in size.
• Layers of dune sand between layers of granular materials shall not be allowed.
• Stabilizing crushed material shall not be laid directly on ground soil, but it shall always be laid on geotextile fabric covering the area to be stabilized as shown on the Drawings.
• For every completed layer of subgrade, three field density tests shall be performed on each unit of carriageway. (One unit being 1500 Sq.m).
4. Subbase Construction:
• Road sub-base material shall be delivered to the roadbed as uniform mixture and shall be spread in layers.
• Segregation shall be avoided, and the sub-base shall be free from pockets of coarse or fine materials.
• Each road sub-base layer shall be spread by finisher and or grader or other approved mechanical methods, watered, shaped to a compacted thickness not exceeding 150 mm and compacted to the required grade and cross- section.
• Compaction test requirements can be achieved in layers exceeding 150mm but not more than 170mm.
• Compaction shall be accomplished over the full width of each layer by compacting from the sides to the center, parallel to the centerline of the road.
• Along curbs, headers, walls, and all places not accessible to the roller, compact the material with approved vibratory rollers or compactors.
• At the time of compaction, the moisture content of the laid material shall not vary by more than + 2 % from the optimum moisture content.
• The granular sub-base shall be compacted to not less than 95 % of the maximum dry density.
• The surface on completion of compaction shall be well closed, free from movement under compaction plant and free from ridges cracks or loose material.
• The finished surfaces of the road sub-base shall not vary at any point more than 10 mm above or below the grade.
• A minimum of four in-situ density tests shall be made in every lot (approximately 1500 sq.m) of granular sub-base laid or as directed by the Engineer.
5. Aggregate Road base:
• This work shall consist of furnishing and placing one or more courses of aggregate, including binder soil if required, on a prepared subgrade or sub-base conformity with the lines, grades thickness and typical cross-section as per approved IFC drawing.
• All aggregate road base material shall be free from dirt, shale or other deleterious matter and shall be of such quality that it will bind readily to form a stable aggregate road base.
• Aggregate road base shall be spread on subgrade or sub-base which has been approved.
• The material shall be spread using a motor grader operated with a mechanism which levels off the material at an even depth and without delay.
• The road base aggregate course shall not be placed when the underlying surface is muddy, or when it is raining or dusting.
• Aggregate road base shall be spread by finisher and or grader or other approved mechanical methods, watered, shaped to a compacted thickness not exceeding 150 mm.
• The material shall be handled in a manner which avoids segregation. Segregated materials shall be remixed until uniform.
• Suitable precautions shall be taken to prevent rutting of the subgrade or sub-base during the spreading of aggregate road base materials.
• The moisture content of the aggregate road base material shall be adjusted prior to compaction, by watering with approved sprinkler trucks or by drying out.
• Aggregate road base shall be compacted to not less than ninety-eight (98) percent of the maximum dry density.
• Rolling shall continue until the entire thickness of each layer is thoroughly and uniformly compacted to the specified density.
• Rolling shall be accompanied by sufficient grader speeding in a manner approved to ensure a smooth surface free from ruts or ridges and having the proper section.
• The surface of the material shall on completion of compaction be well closed, free from movement under the compaction plant and free from compaction planes, ridges, cracks, or loose material.
• Any areas inaccessible to normal compaction equipment shall be compacted by means of mechanical tampers until satisfactory compaction is obtained.
• The surface of the finished aggregate road base will be tested with a three-meter straightedge by the Engineer at selected locations.
• The variations of the surface from the testing edge of the straight edge between any two (2) contacts with the surface shall at no point exceed ten (10mm) when placed on or parallel to the center line or ten (10mm) when placed perpendicular to the center line of the roadway.
• The aggregate cross section as shown on the Drawings shall not vary by more than ten (10) millimeters from the required elevation.
• A minimum of four in-situ Density tests shall be made per unit (1000 sq. m) of aggregate Road base laid.
6. Protection of Compacted Layer:
• Protect all sections of newly compacted pavement from traffic until they have hardened sufficiently to the approval of the consultant and client.
7. Asphalt / Bituminous Pavement Works:
Asphalt mix plant shall be approved by consultant and client and asphalt / bituminous Base Course and surface course / wearing Course Job Mix shall meet the Project Specifications, and to be approved by consultant and client prior to starting the works.
8. Preparation:
• Ensure that the area to receive for asphalt surfacing shall be inspected approve by the consultant and client.
9. Prime coat:
• A prime coat bitumen (MC-70) shall be applied over the Aggregate Road Base at a rate of between 1.13 to 2.26 liters per square meter. At least 48 hours curing time shall be maintained before starting asphalt works.
10. Asphalt base course / binder course:
• The thickness of bituminous Base Course shall be as per approved shop drawing and project specification.
• The bituminous material will be laid using paver.
• Compaction of the bituminous material will be achieved using steel wheel tandem vibratory rollers and pneumatic tire rollers.
• Initial compaction or breakdown rolling will be by a tandem vibratory roller operating in the static mode.
• Subsequent compaction will be carried out using tandem vibratory rollers minimum 3 passes (in the vibratory mode) and followed by pneumatic tire rollers until the material has been fully compacted to achieve the required degree of compaction as per project specification.
• A final ‘finishing’ roll will be carried out using a tandem vibratory roller in the static mode to remove any remaining roller marks.
11. Tack coat:
• Before laying surface / wearing course layer a tack coat of bitumen emulsion will be applied to a clean surface at a rate of between 0.23 to 0.68 liters per m². The emulsion shall be allowed to break prior to commencing surfacing.
12. Asphalt Surface Course / Wearing course:
• The compacted thickness of bituminous surface / wearing Course shall be as per approved shop drawing and project specification.
• The bituminous material will be laid using paver.
• Compaction of the bituminous material will be achieved using steel wheel tandem vibratory rollers and pneumatic tire rollers.
• Initial compaction or breakdown rolling will be by a tandem vibratory roller operating in the static mode.
• Subsequent compaction will be carried out using tandem vibratory rollers minimum 3 passes (in the vibratory mode) and followed by pneumatic tire rollers until the material has been fully compacted to achieve the required degree of compaction as per project specification.
• A final ‘finishing’ roll will be carried out using a tandem vibratory roller in the static mode to remove any remaining roller marks.
13. Level Control:
• Where practicable the paving machine will be equipped with automatic level sensing equipment and / or averaging beam (dependent upon location), referenced to dipped levels obtained from steel pins kerbs or other suitable datum at no more than 10 meter longitudinal intervals, and transversely at intervals commensurate with the required mat widths.
• In constrained areas level adjustment will be by manual control by an experienced operator and referenced to dip levels obtained from steel pins kerbs or other suitable datum at no more than 10 meter longitudinal intervals and transversely at intervals commensurate with the required mat widths.
14. Testing:
• Bituminous materials will be delivered to site within the temperature range 139 to 163OC as per project specification. Material delivered to site outside range will not be incorporated within the works.
• Temperatures will be checked and recorded both at the depot mixing plant and the point of laying by either electrical probes pyrometers or conventional thermometers.
• Bituminous materials will be sampled at site as per project specification and testing of bituminous mixing for specification compliance with respect to aggregate gradation binder content and Marshall Design properties as per project specification.
• Sections of completed pavement layers will be cored on site as soon as practicable for testing for field density compliance as per project specification.
15. Cleaning and Protection:
• When all the activities are completed, the area will be cleaned thoroughly. Once the cleaning is done and approved, a "Request for Inspection" will be raised for acceptance.
16. House Keeping:
• Safety Engineer shall ensure to maintain safety for all aspects.
• Safety assistant are allocated all the site locations to maintain housekeeping.
• All demolished/removed material to be disposed in one allocated area for pick-up/removal from site.
Plant and Equipment:
1. Equipment:
All equipment, plants, machineries, and lifting gears shall be fully serviceable, tested, checked, and certified by third party. All personal shall be fully trained, qualified and competent to carry out their allotted tasks. All cranes and any appropriate lifting gears shall be assemble/rigged in accordance with manufacturers’ recommendations and procedures.
All crane lift operations shall be provided with a crane lift plan prepared by a competent person before commencing of lift and shall be communicated to all parties involved in the lift operation. Generator for electricity shall be provided with drip tray to control any spillage. Upon arrival SAB safety officer shall conduct inspection for each equipment and document all the inspections for records. Each equipment shall be arranged with complete file for all certifications. After approval the equipment shall be allowed to site for work. Following remain outlined to focus:
• The capacity / size of the tools and equipment will be judged in accordance with site conditions, requirements, and availability at the time of execution.
• Fuel shall be provided by mobile fuel tanker on daily basis for the equipment on site.
• SAB shall rely on Mini-Tankers for on-site refueling.
• The refueling and maintenance will be carried out in the designated location.
2. Tools & Equipment for Works:
1. Excavator – For excavation
2. Dump truck – For removing excavated materials
3. Asphalt Paver - Spreading & Leveling
4. Water Bowser - To fill up the Rollers and clean the surface
5. Bitumen Distributor - Application of bitumen materials
6. Hand Sprayer - Bond Coat Spraying
7. Steel-Tired Roller - For compaction
8. Pneumatic-Tired Roller - Secondary Compaction
9. Plate Compactor - For edge compaction
10. Core Cutting Machine - Core Cutting for Testing
11. Air Compressor - Clean the surface
12. Rolling Straight Edge - Measure the tolerance
13. Hand Tools - Rakes, shovels, hand compactors, levelling and smoothing tools, Pavement saw machines, heaters, cleaning tools, hand brooms, small vibratory compactors, liquid asphalt painting, and all other tools that may be needed
14. Calibrated survey tools
Note: Above listed equipment shall be assigned as per requirements of each work during the mobilization stage
3. Storage and Handling:
The safe storage of hazardous chemicals is an essential part of an environmental, health, and safety program. Chemical storage facilities must meet certain minimum standards to satisfy diverse regulations, store must observe several requirements that incorporate safe storage:
- Keeping an up-to-date chemical inventory
- Proper chemical labelling
- Segregating incompatible chemical
- Providing separate storage
- Sheltered storage to avoid direct sunlight
- Area should be free of any ignition sources
- Provide suitable Fire Extinguisher
- Should provide appropriate warning signs.
- No smoking or naked flames near the fuel.
- Do not inhale vapor.
- Read material safety data sheet for the fuel.
- Do not attempt to lift container manually.
- Have an appropriate funnel available.
- Check for leaks.
Conclusion:
Full article on Method Statement for Road and Paving Works | Method Statement for Asphalt Road Construction | Work Methodology for Road Construction | Method Statement for Asphalt Road Construction | Work Method Statement for Road Construction | Method Statement for Construction of Road | Road Construction Method Statement. Thank you for the full reading of this article in "QA QC Civil Engineering" platform in English. If you find this post helpful, then help others by sharing it on social media.
Full article on Method Statement for Road and Paving Works | Method Statement for Asphalt Road Construction | Work Methodology for Road Construction | Method Statement for Asphalt Road Construction | Work Method Statement for Road Construction | Method Statement for Construction of Road | Road Construction Method Statement. Thank you for the full reading of this article in "QA QC Civil Engineering" platform in English. If you find this post helpful, then help others by sharing it on social media.