What is the formula for backfill?

Backfill volume = excavation volume – footing volume – wall volume. … Backfill volume = 207.4 cubic yards.

Backfilling is the process of putting a mixture of soil, rocks or stones back into a trench or foundation after excavation, typically to bury a pipe. Compact proper backfill to provide strong base support for construction, reducing the chance of shifting, erosion or settling.

Backfill should be petroleum coke calcined (heat treated) to remove all other petroleum products, other than carbon, and should be supplied in granular form. Lime in a proportion of 10% by weight of coke breeze should be added to the product. The proposed material should have the properties of Table 4.7.

To find these results:

Using an excavator, fill in twelve inches of mixed materials on the sides of the area. Compress the soil and stone after that. You must continue to backfill until the entire area is filled, repeating the process until all of it is completed. Fill the space in layers; each layer should be 15cm to 20cm thick.

Backfill shall be placed in uniform layers not to exceed 8" loose depth, and compacted to a minimum of 95 percent of Standard Maximum Density (ASTM D 698) at the proper moisture content specified in the Geotechnical report for this project.

Backfill correctly

We recommend a 10-20mm clean, free drainage aggregate such as river stones or coarse crushed rock. It is imperative that the material is free from any soil, sand or other fines to ensure that water can flow freely through the drainage area and away from the back of the wall.

EPS Geofoam is the most commonly used material when a lightweight void fill is needed. Expanded polystyrene weighs from just under 1 pound per cubic foot to 3 pounds per cubic foot and has a very high compression strength.

Your first option is coarse-grained soil. This is a mixture of gravel, sandy soil, and a negligible amount of fine materials. This is a high-quality backfill since it provides fine support for the foundation and is pretty easy to compact.

CA7, otherwise known as ¾” limestone, or sometimes as 1” limestone, and commonly referred to as “bedding stone”, is an angular white/gray stone that self-compacts, making it ideal for use in backfill as well as pipe bedding, subbase and drainage situations.

Many people choose fill sand because it is attractive and affordable. It's very useful for in wet areas that need help dealing with drainage problems. Fill sand is recommended if your project requires a backfill material.

TORPEDO SAND

Since it's simple and coarse, and since it can drain well, it is a great product for backfill and subbase. You can also mix torpedo sand with black dirt to make it easier to work with.

The compaction of the backfilled soil needs to be conducted in compacted layers not exceeding 150 mm thick, which is often performed with a vibrating plate or a power rammer depending on the size of the backfilled area. The compaction is often not easy on confined sites and spreads dust around the surrounding areas.

The Backfilling Risk Assessment will give you a good indication of the hazards and risks you need to control when completing this activity. It identifies the common hazards like excavation collapse, falls of people, falls of vehicles and plant, fumes, contamination, and underground services.

There's a lot of weight on the foundation of a house, both literally and figuratively. Backfilling too early adds pressure to the concrete before it has had a chance to fully cure. Under ideal conditions, it takes 5-7 days for concrete walls to cure to 75%, and 28 days to be fully cured.

Using the Unified Soil Classification system, well-graded soils classified as GW, SW, GM, SM, GC, or SC that are primarily non-plastic are generally acceptable for backfilling flexible structures. However, ML and CL materials, which are primarily silt and clay, should be avoided.

First, keep the height of the backfill to no more than 4 feet except at the corners or offsets until the deck is in place. Four feet of unbalanced backfill usually will not exert sufficient pressure to damage the wall. You generally can backfill to full height at corners and offsets.

If the soil type you're working with is sand, sandy loam, gravel or a combination of all three, backfilling with the native material will work just fine. But if its silt or clay, with or without rocks, it will be difficult to keep the post in the ground.

Formula for Crushed Stone for a Project

In the construction world, most materials are measured in cubic yards. Multiply the length (L), in feet, by the width (W), in feet, by the height (H), in feet, and divide by 27. This number is how many cubic yards of crushed stone you need.

One of the most common fill options is slag and ash, which is known for its overall versatility. Slag and ash can also be combined with clay to create a plastic fill material for use in certain projects.

Backfill beneath concrete flat-work along foundation walls should be accomplished with a granular material that is uniform in size. Some fill materials, such as round stones like pea gravel, tend to be self compacting. “I recommend open-graded granular material be used,” says Tull.

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.

Second, a retaining wall must have properly compacted backfill. Backfill refers to the dirt behind the wall. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall.