Detailed Specification for Providing and Laying Brick Masonry
1. Scope of Work
This specification outlines the requirements for providing and laying brick masonry using standard modular burnt bricks (2nd class) and cement mortar. The work includes:
- Mixing and laying of brick masonry.
- Striking out joints.
- Curing.
- Finishing.
- Scaffolding.
2. Materials
2.1 Bricks
- Type: Standard modular burnt bricks (2nd class).
- Quality: Bricks should be made of good brick earth, thoroughly burnt, and free from cracks and organic impurities. They should have a uniform shape and size, with sharp edges and corners[1].
- Dimensions: Bricks should conform to IS 1077:1992 standards[2].
2.2 Cement and Sand Mortar
- Cement: Ordinary Portland Cement (OPC) conforming to IS 269:2015 standards[3].
- Sand: Clean, well-graded sand free from silt, clay, and organic matter, conforming to IS 383:2016 standards[4].
- Mix Ratio: The cement and sand mortar should be mixed in a ratio of 1:5 by mass[5].
3. Construction Methodology
3.1 Preparation of Site
- Site Clearance: Clear the site of all vegetation, roots, and debris. Remove tree roots to a minimum depth of 1.20 meters below ground level.
- Excavation: Excavate to the required depth and dimensions as per the drawings. Over-excavation should be backfilled with compacted gravel or murrum.
3.2 Mixing of Mortar
- Machine Mixing: Use a mechanical mixer to ensure a uniform mix of cement and sand. Add water gradually to achieve the desired consistency.
- Mixing Time: Mix for at least 3 minutes to ensure thorough blending of materials[5].
3.3 Laying of Brick Masonry
- Soaking of Bricks: Soak bricks in water for at least 12 hours before use to prevent absorption of water from the mortar[6].
- Placement of Bricks: Lay bricks in English bond unless specified otherwise. Ensure that each course is horizontal and walls are plumb.
- Mortar Application: Apply mortar to the bed and sides of each brick. Ensure full contact between bricks and mortar to avoid voids.
- Striking Out Joints: Strike out the mortar joints to a depth of 10 mm while the mortar is still green to provide a key for plastering[7].
3.4 Scaffolding
- Erection: Erect scaffolding as required to reach higher levels. Ensure scaffolding is stable and safe for workers[8].
- Types: Use single or double scaffolding depending on the height and complexity of the structure[8].
3.5 Finishing
- Trimming and Dressing: Trim and dress the masonry to the required profile and dimensions as per the drawings. Ensure a neat and uniform appearance[9].
3.6 Curing
- Curing Method: Keep the masonry moist for at least 7 days to ensure proper curing. Use wet burlap or water spray to maintain moisture[10].
4. Quality Control
4.1 Material Testing
- Bricks: Test bricks for compressive strength, water absorption, and efflorescence[2].
- Mortar: Test mortar for compressive strength and consistency[5].
4.2 Inspection
- Site Inspection: Conduct regular inspections to ensure compliance with specifications.
- Final Inspection: Perform a final inspection upon completion to ensure all requirements are met.
5. Measurement and Payment
5.1 Measurement
- Measure the work in cubic meters of the finished masonry.
5.2 Payment
- Payment will be made at the unit rate per cubic meter as specified in the Bill of Quantities. The rate includes the cost of all materials, labor, equipment, and other incidental expenses required to complete the work as per the specifications.
References
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