Which material is NOT typically used for constructing RECPs?

RECPs, or Rolled Erosion Control Products, are commonly used in erosion control applications and can be made from various biodegradable materials. Coir, straw, and coconut are all organic materials that are effective for enhancing soil stability and promoting vegetation growth. Coir, derived from coconut husk, and straw, usually from cereal crops, are particularly popular due to their natural composition and ability to decompose, thus enriching the soil as they break down.

Concrete, on the other hand, is not used in the construction of RECPs. Concrete is a rigid material that does not provide the necessary flexibility or permeability that is often required for erosion control. Instead of promoting vegetation growth and soil health, concrete structures can create runoff issues and prevent the natural infiltration of water into the soil. Thus, among the options, concrete stands out as it does not align with the functional goals of RECPs, which aim to enhance soil protection and plant establishment.