Q3-2 Can recycled crushed stone be used for retaining wall construction?

When using "gravel, etc." for the permeable layer of non-strength concrete or reinforced concrete retaining wall, pure gravel, sand, crackerran or grain size adjustment crushed stone is used, and the use of recycled materials is not permitted. . This is because when the recycled material retains water, the solidification of cement components may cause a decline in the permeability function.

For crushed stones laid under the bottom of the retaining wall, pure crushed stones etc. are used in principle to convey the vertical load of the foundation of the retaining wall to the ground evenly, and to prevent the retaining wall from falling due to uneven settlement of the foundation. However, even if it is a recycled material, it may be used if it is credible for strength and durability (RM-40, etc.).

Summary of Guides, etc. on this answer

• About the permeable layer of the retaining wall
  "Guide to Residential Land Development"

Contact for inquiries regarding this answer

• About permission of construction about residential land development
  Housing and Architecture Bureau Residential Land Examination Department

For specific details in a specific location, please contact the person in charge of each area.