This standard is issued under the fixed designation D ; the number immediately NOTE 2—The following ASTM standards may be found useful in. Joints for bell and spigot VCP shall conform to ASTM Designation: C Installation of . ASTM D Class I, II or III (Classes I and II allow up to 1 ½“ rock). ASTM D A Few of Your Responsibilities. Thus, it is incumbent upon the product manufacturer, specifier, or project engineer to verify and assure that the.

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Specific paragraphs in the appendix are referenced in the body of this practice for informational purposes. Terms of Use and Privacy Statement.

These recommendations are intended to ensure aetm stable underground environment for thermoplastic pipe under a wide range of service conditions. Also, crushed stone may need to be transported to a project site from significant distances away.

This study will provide constrained modulus data to justify the separation of the two soil types and provide constrained modulus values for recommended compaction densities of select granular materials. Another approach is for the researcher to establish an alternative method of obtaining the constrained modulus v2321.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Asstm research will develop constrained modulus and Duncan-Selig design values for crushed stone and common granular backfill soils for culvert installations.

Additionally, the instrumentation will determine the lateral force exerted on the insitu soils.

Current presumptive values for soils containing crushed stone are based on few, or no, physical soil tests. As a result, there is often uncertainty regarding how best to select appropriate M s values when performing buckling checks on structures analyzed using CANDE.

  ASTM D6729 PDF

Characterization of Granular Materials for use in Supporting Buried Structures

There are very few soil laboratories equipped to perform these large-scale tests. The constrained modulus is also used to evaluate global buckling in long span structures Many of the presumptive values are based on testing only one type of soil and extrapolating the data for other soil types.

However, crushed stone is a preferred embedment and backfill material for buried flexible structures. This recommendation will include a revised table reflecting the constrained modulus for granular fill materials at the recommended stress levels.

Culverts, Soil structure interaction, Granular materials, Crushed aggregates, Soil compaction, Burial depth, Constrained modulus, Modulus, Backfill soils.

Does PVC Require Class I Backfill in All Applications? > Contech Engineered Solutions

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

The constrained modulus M s of soil is necessary for the mechanistic design of astmm flexible structures and large buried bridge structures.

Link to Active This link will always route to the current Active version of the standard. Gravel, crushed rock and granular fill materials i.

ASTM D2321 Thermoplastic Pipe or Tubing Supplier

This is particularly true for flexible culverts, which are soil-structure interaction systems that rely on the stiffness of backfill s2321 to resist vertical loads. The project will include four objectives. Since the constrained modulus depends on confining pressure, the values for constrained modulus may increase with depth.


In addition to the naturally mined materials, designers are in need of constrained modulus values for recycled concretes and other manufactured embedment materials. The accurate definition of the stiffness of granular fill material will have significant value in estimating behavior in deep burial installations.

The intent of the testing is to provide modulus data for a range of backfill and bedding materials commonly considered for use with buried structures. The following ASTM standards may be found useful in connection with this practice: Construction Design Materials Geotechnology Bridges and other structures.

Accurately characterizing the relationship between the density and stiffness of crushed stone will enable these soil-structure interaction systems to be designed more cost effectively. Follow-on research may require field validation of installed pipe and buried bridges designed with the results of this research and the ability to achieve good compaction levels in confined areas.

Presently those values are not known with a high degree of confidence. A commentary on factors important in achieving a satisfactory installation is included in Appendix X1.

These tests are difficult to perform because large specimens are required with specialized equipment not typically available in commercial test facilities.

Thus, it is incumbent upon the product manufacturer, specifier, or project engineer to verify and assure that the pipe specified for an intended application, when installed according to procedures outlined in this practice, will provide a long term, satisfactory performance according to criteria established for that application.