ASTM C1531

Full Name

ASTM C1531 – Standard Test Methods for In Situ Measurement of Masonry Mortar Joint Shear Strength Index


These test methods cover procedures for the determination of the average in situ mortar joint shear strength index in existing unreinforced solid-unit and ungrouted hollow-unit masonry built with clay or concrete units.


coefficient of friction; flatjack; in situ; masonry; mortar joint; nondestructive evaluation; shear strength