Standard Guide for Design and Construction of Coal Ash Structural Fills

Importancia y uso:

4.1 General: 

4.1.1 Many CCPs are suitable materials for the construction of engineered structural fills. CCPs may be used as: structural fill for building sites and foundations; embankments for highways and railroads, road bases, dikes, and levees; and in any other application requiring a compacted fill material. Their low unit weight, relatively high shear strength, ease of handling, and compaction make CCPs useful as fill material. However, the specific engineering and environmental properties of these materials can vary from source to source and must be evaluated for each material, or combination of materials, to be used for an engineered structural fill. Information contained in Guide D5759 may be applicable to some CCPs to be used in engineered structural fills. AASHTO Standard Practice PP059-09-UL also addresses the use of coal combustion fly ash in embankments. The requirements for the type of CCPs that can be used for specific engineered structural fills may also vary because of local site conditions or the intended use of the fill, or both. Environmental considerations are addressed in Section 5.

4.1.2 CCPs can be a cost-effective fill material. In many areas, they are available in bulk quantities at a reasonable cost. The use of CCPs conserves other resources and reduces the expenditures required for the purchase, permitting, and operation of a soil borrow pit. CCPs often can be delivered to a job site at near optimum moisture content and generally do not require additional crushing, screening, or processing as compared to comparable native materials.

4.1.3 Use of CCPs conserves natural resources by avoiding extraction or mining of soils, aggregates, or similar fill material that also conserves energy and reduces greenhouse gas emissions.

4.1.4 The volume of beneficially used CCPs preserves valuable landfill space.

4.2 Regulatory Framework: 

4.2.1 Federal—Currently, there are no federal regulations addressing the beneficial use of CCPs. States and local jurisdictions have oversight of CCP management and beneficial use activities within their states

4.2.2 State and Local Jurisdictions—Laws and regulations regarding the use of CCPs vary by state and local jurisdictions. It is incumbent upon the project owner and designer to determine any local or state guidance, policies, or regulations pertaining to the use of CCPs.

Subcomité:

E50.03

Referida por:

D7762-18E01, E3183-24

Volúmen:

11.06

Número ICS:

13.020.40 (Pollution, pollution control and conservation)

Palabras clave:

bottom ash; CCPs; coal ash; embankment; environmental considerations; fly ash; resource conservation; structural fill; utilization;