What is the difference between Class 1 and 2 backfill?

What is the difference between Class 1 and 2 backfill?

Recommended Use: Class 2 backfill should only be specified when native material can meet the requirements of Class 1 Backfill. The use of unsuitable materials for Class 2 has resulted in pipe failures and settlement problems due the use of unsuitable material as structure backfill.

What are the classifications of backfill materials?

Suitable Backfill Material. Class II, Class III, Class IVA, or Class IVB as defined in Article 2552.02, C. b.      Unsuitable Backfill Material.

What type of backfill do I need for my project?

Plastic: Use flow-fill or Class 1. Concrete: Use Class 1** with 3 inches of bedding material. ** Backfill Class 2 may be specified only if material generated on the project meets the requirements for Class 1. For all pipe trenches in rock, a 12″ layer of Backfill Class 1 is required beneath the pipe.

How much compaction is required for Class 3 backfill?

For Class III and Class IVA backfill materials, compact to at least 90% of Standard Proctor Density. Obtain required compaction within a soil moisture range of optimum moisture to 4% above optimum moisture content. 3. Special Pipe Embedment and Encasement Materials: a.

Does PVC Require Class I Backfill in All Applications …

ASTM D2321 would classify stone as Class I backfill material. There are two main types of gravity PVC pipes used in the sanitary industry, solid wall SDR and profile wall (e.g. Contech’s A-2000 – www.conteches.com/a-2000) PVC pipe… and both follow ASTM D2321. So, for gravity flow sanitary applications, you are typically required to use the crushed stone backfill.

REVIEW OF NEW SPECIFICATION OR …

Apr 26, 2012 · Class 1 and Class 2 structure backfill shall be composed of non-organic mineral aggregates and soil from excavations, borrow pits, or other sources. Material shall conform to the requirements of subsection 703.08. Class of material shall …

8 Specification of earthworks fill materials | bs6031-2009

8.2.2 Compaction requirements. It is important that the designer decides whether a material is to be controlled by “method” or “end product” compaction; attempting to combine both approaches for the same material is not appropriate. However, it should be realized that a limited amount of testing should be undertaken during method compaction to …

Class 1 Backfill Material – March 2022

Plastic: Use flow-fill or Class 1. Concrete: Use Class 1** with 3 inches of bedding material. ** Backfill Class 2 may be specified only if material generated on the project meets the requirements for Class 1. For all pipe trenches in rock, a 12″ layer of Backfill Class 1 is required beneath the pipe.

02255-Bedding, Backfill, and Embankment Materials

1. Class I: Well-graded gravels and sands, gravel-sand mixtures, crushed well-graded rock, little or no fines (GW, SW): a. Plasticity index: non-plastic. b. Gradation: D 60 /D 10 – greater than 4 percent; amount passing No. 200 sieve – less than or equal to 5 percent. 2. Class II: Poorly graded gravels and sands, silty gravels and sands, little to

Structure Backfill Design Aid – Colorado Department of …

Jun 26, 1997 · Structure Backfill (Class 1) Description: Graded material defined in Subsection 703.08 (a). 100% passing the 2 inch sieve. 30-100% passing the #4 sieve. 10- 60% passing the #50 sieve. 5- 20% passing the #200 sieve. Maximum Liquid Limit of 35. Maximum Plasticity Index of 6. Advantages: Readily available material. Good backfill material.

2012 Standard Specifications Manual – 10 MATERIALS

CLASS I. Class I select material is silty or clayey soil material meeting AASHTO M 145 for soil classification A-4. Soil materials which meet AASHTO M 145 for soil classifications A-2, A-5, A-6 and A-7 are acceptable provided such materials do not have a LL greater than 50, nor a PI of less than 7 or greater than 20.

Permeable Aggregate Materials and Filter Fabrics – Graniterock

The alternative gradings within Class 1 permeable material are identified by types. The Contractor will be permitted to furnish and place any one of the types provided for this class. … Backfill with the proper Permeable Material as per project specifications. FILTER FABRICS OR ENGINEERING FABRICS The following fabrics are listed per Caltrans …

Backfill Material Specification – Basic Things to Consider …

Basic Definition. Imported soil material, fill, fill material – terms used to indicate backfill materials (also with different types).; Technical specification – a document which is part of the contract that describes the requirements that a project or a work must meet or pass.; Material approval sheet – a document showing the description of the materials, its supplier, and manufacturer …

Section 3010 – Trench Excavation & Backfill

1. Place suitable backfill material from 1 foot above the top of the pipe to the top of the trench. a. Use no more than 8 inch thick lifts for backfill areas more than 3 feet below the bottom of pavement. b. Use no more than 6 inch thick lifts for backfill areas less than or equal to 3 feet below the bottom of pavement. 2.
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