mechanical concreteGood news is coming from the construction industry, where end of life tires (ELT) found an application which years has been proven to be successful during 11 years of its use.

Samuel G. Bonasso is a civil engineer, fellow American Society of Civil Engineers with extensive national and global, private and public civil and structural engineering design and construction experience. He invented Mechanical Concrete – a confined aggregate concrete in used tires used in the field of geosynthetics. It confines stone aggregates in a thin-walled cylinder. Confinement with tires improves the structural performance of crushed stone and all other aggregate materials. Removing both sidewalls from an end of life tire creates an industrial strength, low cost tire-derived-geosynthetic-cylinder. 

The product is lab tested and its use is proven successful in constructing highway bases and shoulders, abutments for bridges, retaining walls, channel erosion protection and water retention constructions. Mechanical concrete reinforced with tires is a strong and economical method for physically stabilizing and reinforcing stone aggregates used in soils. Currently, the product is only available through licensed distributors and is protected by patent in the U.S. and Canada.

Most geosynthetics technologies work by improving friction. Mechanical Concrete® is the first economical, industrial strength method of confining aggregates. New-tire design factors make a tire-derived-geo-cylinder, TDGC, as much as five times stronger than most designs require—that’s virtually indestructible in civil engineering, mining, heavy construction and agricultural applications. Reusing waste-tire-cylinders is green, strong and economical.

mechanical concreteMechanical Concrete® road bases physically bind together granular soils or stone particles and then spreads out applied loads over the subgrade. This improves overall performance of both paved and unpaved roads. TDGC confinement effectively redistributes a loaded truck wheel over 3 to 6 times more sub-base area. Proof tested at 200psi, TDGC confinement multiplies the load supporting capacity of crushed stone, sand, and soils. Experience with gravel surfaced mining roads shows Mechanical Concrete® reduces unpaved road maintenance by 75%. It eliminates serious road edge and ditch collapse failures, loss of road width, potholes and ruts. Since 2010 road bases of Mechanical Concrete® have supported over 500,000 coal trucks per year, resisted floods, freeze and thaw cycles. These heavily traveled industrial roads have crushed stone, concrete, and asphalt surfaces on WV and Ohio subgrades. It also supports low volume roads on supersoft California sand and Arizona desert sand, and public roads in the South Texas, Eagle Ford play. Mechanical Concrete® builds strong, economical road bases in any environment, on any subgrade soil.

The product was approved on a project basis by the West Virginia Division of Highways Materials Division. The use of buried waste tire derived materials in civil engineering applications is encouraged by all state and federal environmental agencies. The Reason It Works Better Road failures are caused by water penetrating into the compacted base-stone binder causing it to loose friction and strength. Mechanical Concrete® tire derived geo cylinders, laid down “round-to-the-eye”, physically confines and holds AASHTO #57 base stone together. This process consistently creates a virtually indestructible, water-permeable base without mesh, adhesives, binders or friction. So it dramatically reduces or eliminates:

  • Potholes & Ruts
  • Road Edge & Ditch Wall Collapse
  • Slope & Shoulder Erosion
  • Soft Sub-Grade Failures
  • Ditch & Channel Scour
  • Active Soil Pressure

The product is currently distributed by Reinforced Aggregates Company.

More information about the product is available at the official website: