What is 6N backfill?
6N. Also known as Crushed Concrete, Brick Rubble. Size: 20mm to dust. Application: This aggregate consists of crushed concrete, brick and mortar. It’s created as a by-product from demolition projects and used as a backfill material for concrete structures such as bridge abutments.
What material is used for backfill?
Backfill materials can generally be graded as: Coarse grained soils – gravelly and sandy soils ranging from clay to gravel. Fine grained soils of low to medium plasticity – inorganic clays of low to medium plasticity, inorganic silts and very fine sands of low plasticity.
How do you calculate backfilling?
For example, find the cubic footage volume of a backfill area that is 8 feet wide, 6 feet deep and 50 feet long. The volume of a rectangular cubed shape is found by the formula v = l x w x d, where v represents volume, l is the length of the trench, w is the width and d is the depth.
What is 6P fill?
6P – Selected granular material (Fill to structures) 6Q – Well graded uniformly graded or coarse granular material (Overlying fill for corrugated steel buried structures) 6R – Selected granular material (For stabilisation with lime and cement to form capping (Class 9F)
What is 6i fill?
Description. A limestone/granite, ragstone crushed quarried aggregate containing a well graded mixture of solids and fines.
What is the thickness of backfill layer?
Cohesive backfill shall be deposited in horizontal layers not exceeding 200 mm in thickness. Every layer shall be tamped in place and well compacted by means of mechanical tampers before the next layer is deposited.
What is good fill material?
Solid Foundations Fill dirt can also be used in landscaping projects. Dirt is a versatile fill material and can be used to level out dips or hills, build up a landscape, or occupy the areas around underground pipes.
What is the best material for compaction?
Cohesive soils such as silt and clay are best compacted using the impact force produced by an upright rammer. There are generally two types of soil when it comes to compacting, granular soils and cohesive soils.
How do you find the volume of a backfill with compaction?
Backfill for Figure 3.1:
- Backfill volume = excavation volume – footing volume – wall volume.
- (Note that only the portion of the wall that is in the trench is deducted, so the height of wall in the trench is the average trench depth minus 2′-0” for the footing: 6′-0” – 2′-0” is 4′-0”)
- Backfill volume = 207.4 cubic yards.
What is 6N used for?
6N Fines are primarily used as a backfill material for concrete structures such as bridge abutments and general backfill.
What is 6L material?
6L – Selected uniformly graded granular material (Upper bedding for corrugated steel buried structures)
What is 6F material?
The 6F class of aggregates refers to those materials which have been recycled from building, demolition or other construction sites. Recycled or secondary aggregates are becoming increasingly important to sites throughout the UK as demand rises.
What is Type B backfill?
Type B is often used as a lightweight backfill for retaining walls and embankment construction on weak soils. Type A TDA is often utilized in landfill leachate and gas collection and removal systems. TDA is used as an alternative to geofoam, pumice, and gravel.
What is type1 backfill?
Type 1 Sub Base is generally a 40mm graded to dust material that is laid and compacted to form a level stable construction layer as a platform for asphalt or concrete. It is typically used in the construction of highways, car parks, footways and hard standing areas.
Which soil is used for backfilling?
Different Types of Backfilling Material Coarse-grained soils include gravelly and sandy soils and range from clayey sands (SC) through the well-graded gravels of gravel-sand mixtures (GW) with little or no fines.
What is the suitable type of backfill soil?
Coarse-grained soil: This is standard backfill material in home construction. It contains sand, gravel, and small amounts of fine materials. This backfill provides ample support for your foundation and is easy to tamp down.
What is the density of the backfill material?
Backfill material will be Class 6N with a density ( γ) = 19kN/m 3. The initial design will be based on using C32/40 concrete to BS 8500 and Grade B500B reinforcement to BS 4449.
What is a 6N material?
Recycled materials and IBAA are well suited to be used as a 6N, they both have properties that mean they have a high angle of internal friction which is a test requirement for this material Also known as granular fill material, or back fill to structures
What materials are used for backfill?
Backfill materials that are commonly used are described below with their engineering properties. Coarse-grained soils include gravelly and sandy soils and range from clayey sands (SC) through the well-graded gravels of gravel-sand mixtures (GW) with little or no fines.
What is the difference between Type 1 and 6n granular fill?
Selected granular fills for use in embankments and as backfill to concrete structures 6N will have a wider grading envelope compared to a Type 1 and allows particles ranging between 0mm to 80mm