ISO

ASTM A370, A416, ISO 15630 Tensile Testing of Multi-Wire Strand for Prestressed Concrete

by Instron

View Instron on TEKEN44

In order to test 7-wire strand according to ASTM A370, A416, or ISO 156303, we decided to use an Industrial Series Model 600KPX. Since most wire strand applications require specimen lengths of 500 mm and greater, this frame was chosen primarily because of its convenient, large test space and long stroke actuator. This made it easy for the operator to install and remove specimens without a need for a ladder or pit mounting the machine. We used a set of side-acting, hydraulic grips with wire strand inserts. The side-acting design helps eliminate problems associated with traditional wedge grips that include grip failures, time-consuming grip changes and inaccuracy of total elongation measurements. Clamping forces up to 900 kN (202,300 lbf) were available for positive gripping the wire strand specimen. The wire strand insert arrangement allows for quick changeovers between different specimen diameters.