flat jack testing

Lab 6- Non-Destructive Evaluation - The Masonry Society

FLAT JACK TESTING Flat jack testing method is used to determine the acting stresses (single flat jack) or to evaluate the mechanical parameters of the masonry/concrete structures. The testing technique is based on the release of the stress in a small area of a structure by a plane cut perpendicular to its surface. The flat jack is then

Non-Destructive Testing of Masonry Structures

Flatjack testing is a non-destructive way to evaluate the stress condition of in-situ masonry. Mortar joints in a local building are cut out and preloaded. Two methods of testing are utilized: measurement across one cut to evaluate acting stress and between two cuts to evaluate deformation or modulus of elasticity of the masonry wall.

of the flat-jack were used to pack the flat-jack inside the cut and to protect the equipment from the rough surface of the masonry or local swelling. Figure 1. Semi-circular flat-jack with (A) 34.5 cm and (B) 25.5 cm. 3. DOUBLE FLAT-JACK TEST The double flat-jack test described in ASTM C 1197-04 (2004) and in RILEM MDT.D.5 (2004)

contact surface between the flat-jack and the cut (paper stamp). DOUBLE FLAT-JACK TEST The double flat-jack test supports the assessment of the masonry deformability properties in compression. The test procedure is described in ASTM C 1197-04 (2004) and in RILEM MDT.D.5 (2004). In this test two horizontal cuts, 40.0 cm spaced, were made in the wall

A flat jack testing equipment consists of flexible steel envelope which is very thin and fits within the masonry mortar joint. This flat jack is then hydraulically pressurized to apply stress on the surrounding masonry structures.

PRISM TEST, FLAT JACK TEST, REBOUND HAMMER, & MECHANICAL PULSE VELOCITY . PRISM TEST(Introduction) ... FLAT JACK TEST (INTRODUCTION) It is a field test ... Apply pressure into the flat jack with the help of the hydraulic pump.