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NATIONAL HIGHWAY AUTHORITY Office of The General Manager (Sindh North) NHA Complex Airport Road, Sukkur Tel: 0715633256, Fax 0715633257 Abstract of Bill of Quantities & Cost Contract No. EMSN135056

How to fill out water bound macadam

How to fill out water bound macadam:

1. Prepare the sub-base: Clear the area of any loose debris or vegetation. Level the surface and compact the soil to create a stable base for the water bound macadam.
2. Spread the coarse aggregates: Spread a layer of coarse aggregates evenly over the prepared sub-base. The size of the aggregates should be between 40mm to 60mm. Use a rake or shovel to distribute them uniformly.
3. Apply screenings: Next, apply a layer of screenings over the coarse aggregates. Screenings are finer aggregates that help to bind the macadam together. Use a spreader or rake to ensure an even distribution.
4. Mix the materials: Use a mechanical mixer or a motorized hand mixing tool to thoroughly blend the coarse aggregates and screenings. The mixture should be well-combined, ensuring that all the aggregates are coated evenly with the screenings.
5. Moisture content: The moisture content of the mixture is crucial for proper compaction and binding. It should be neither too dry nor too wet. Add water gradually while mixing until the desired moisture content is achieved.
6. Compaction: Use a mechanical compactor or a vibrating plate compactor to compact the water bound macadam. Start from the edges and work your way towards the center, ensuring uniform compaction. Repeat the compaction process multiple times to achieve the desired density.
7. Surface dressing: After compaction, apply a layer of screenings over the compacted macadam to fill any voids and provide a smooth surface. Use a rake or broom to spread the screenings uniformly and then lightly compact the surface again.

Who needs water bound macadam:

1. Road construction companies: Water bound macadam is commonly used in road construction for sub-base and base layers. It provides a durable and stable foundation for the surface asphalt or concrete layers.
2. Civil engineers: Civil engineers involved in infrastructure projects such as roads, highways, and parking lots may recommend or specify the use of water bound macadam to ensure long-lasting and functional roadways.
3. Property owners: Individuals or organizations responsible for maintaining private roads, driveways, or parking areas may choose to use water bound macadam due to its cost-effectiveness, versatility, and suitability for light to moderate traffic loads.
4. Municipalities and government agencies: Water bound macadam may be used by local authorities for the construction or maintenance of rural roads, agricultural lanes, or temporary access routes. Its ease of construction and low maintenance requirements make it a preferred choice in certain situations.
5. Construction contractors: Contractors involved in the construction of industrial yards, construction site access roads, or temporary haul roads may opt for water bound macadam as a quick and economical solution to create a stable working surface.

For pdfFiller’s FAQs

What is water bound macadam?

Water Bound Macadam (WBM) is a type of road construction material used for laying the base layer of roads. It consists of mineral aggregates bound together with water.

Who is required to file water bound macadam?

Contractors and construction companies involved in road construction projects are required to file water bound macadam.

How to fill out water bound macadam?

Water bound macadam is filled out by providing details of the type and quality of aggregates used, the water content, compaction process, and curing method.

What is the purpose of water bound macadam?

The purpose of water bound macadam is to provide a strong and durable base layer for roads that can withstand the weight of traffic and weather conditions.

What information must be reported on water bound macadam?

The information that must be reported on water bound macadam includes the type and quality of materials used, compaction details, curing method, and any testing results.

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