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(SAMI) Stress Absorbing Membrane Interlayer
A thin layer that is placed between an underlying pavement and an HMA overlay for the purpose of dissipating movements and stresses at a joint or crack in the underlying pavement before they create stresses in the overlay. SAMIs consist of a spray application of rubber- or polymer-modified asphalt as the stress-relieving material, followed by placing and seating aggregate chips.