SHEAR1    –    Uniaxial    Shear    Tester    is    a    compact,    cost-effective alternative    to    the    Superpave    Shear    Tester    for    asphalt    testing. Used    with    Universal    Testing    Machines    (UTM)    or    Nottingham Asphalt    Tester    (NAT),    it    measures    shear    properties    of    asphalt mixtures     to     assess     resistance     to     permanent     deformations, calculate   pavement   rutting,   optimize   mix   design,   and   perform quality checks. SHEAR1   can   test   both   laboratory-prepared   samples   and   cores   taken directly    from    pavements,    applying    shear    stress    in    the    direction corresponding    to    real    traffic    loads    for    more    accurate,    real-world results.   Invented   at   UC   Berkeley   and   Czech   Technical   University,   it provides    results    highly    correlated    to    AASHTO    T320-07    standards. Requiring    only    standard    lab    equipment    such    as    a    UTM,    NAT,    or Gyratory    Compactor,    SHEAR1    is    highly    economical,    versatile,    and significantly    simpler    than    a    Superpave    Shear    Tester    or    Hamburg- Wheel   Tracking   Device,   reducing   acquisition   and   operational   costs   up to tenfold while maintaining reliable performance.

ECONOMICAL • Low initial costs • Considerably     lower     operational     costs     compared     to     using Hamburg-Wheel Tracking Device or Superpave Shear Tester • Only    standard    laboratory    equipment    is    needed    (UTM,    NAT, Gyratory Compactor) VERSATILITY • Can   be   used   for   testing   laboratory   samples   or   samples   taken directly from roads • Asphalt mixture design • Pavement maintenance and quality checks • Asphalt mixture component optimization • Assessment     of     asphalt     mixture     resistance     to     permanent deformations ACCURACY • Shear   stress   is   applied   in   direction   corresponding   to   the   stress created from traffic load in pavement • Testing   shear   properties   of   asphalt   mixtures   is   therefore   closer to real conditions • The   performance   of   SHEAR1   has   been   tested   and   compared   to Superpave   Shear   Tester.   It   has   shown   highly   correlated   results as published by the inventor