Glossary of Terms and Acronyms Page 24 | 27 water from wicking toward the surface, eliminating frost heaving. • Lightweight TDA Definition: Tire Derived Aggregate is approximately 1/3 weight of soils (600 pounds per loose volume cubic yard). 1 ton = 1.67 cubic yards (in place). In place density = 45-50 pounds per cubic foot. • High Permeability TDA Definition: Drains ten times better than soil. TDA is free draining and has higher permeability than typical drainage rock. (> 1 to 30 cm/sec.) • Interlocking: The fibrous nature of TDA produces internal reinforcement, creating a “Snowshoe Effect” which prevents differential settlement and adds global support to an overlying structure. • Lateral Load: Live loads that are applied parallel to the ground. They are horizontal forces acting on a structure. They are different to gravity loads which are vertical, downward forces. For example, water and earth pressures. • Shear Strength: The strength of a material or component against the type of yield or structural failure where the material of component fails in shear. The shear strength is the load that an object is able to withstand in a direct parallel to the face of the material as opposed to perpendicular to the surface. • Thermal Insulation: Process of insulating material from transferring heat between the materials that are in thermal contact. TDA is eight times better than stone with an R- Value of 7. • Void Space: TDA has a large storage capacity due to its 50% Void Space (10% greater than stone). Void Ratio: The void ratio of a mixture is the ratio of the volume of voids to the volume of solids. It is a dimensionless quantity in material science and is closely related to porosity. • Water Filtration: is the process of removing or reducing the concentration of particulate matter, including particles, parasites, bacteria, algae, viruses and fungi, as well as chemical and biological contaminates from contaminated drinking water. Tire-Derived Fuel (TDF) A fuel derived from scrap tires of various kinds. This may include whole tires or tires processed into uniform flowable pieces which satisfy the specifications of the fuel end-user. TDF has a high BTU value and can lower greenhouse gas emissions when compared to coal and other fuel oil. TDF may be used in cement kilns, pulp and paper mills, and electric utility boilers. Tire-Derived Material (TDM) TDM is considered a feedstock material derived from a waste/scrap tire. Tires are processed to meet market specifications, for example, crumb rubber, ground rubber, tire- derived aggregate, and tire-derived fuel. Tire-Derived Product (TDP) Product made entirely or in part from tire-derived material.
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