Pick tool

A pick tool for degrading asphalt, comprising a PCD element;

• the PCD element comprising a PCD structure bonded to a cemented carbide support body at an interface;
• the PCD structure comprising a first region and a second region adjacent the first region, the second region bonded to the first region by intergrowth of diamond grains;
• the first region comprising a plurality of alternating strata, each stratum having a thickness in the range of 30 to 300 microns;
• the second region comprising a plurality of strata, one or more strata in the second region having a thickness greater than the thicknesses of the individual strata in the first region, wherein the alternating strata in the first region comprise first strata alternating with second strata, the first strata being in a state of residual compressive stress and the second strata being in a state of residual tensile stress;
• in which the PCD structure defines a working end including a rounded conical apex having a radius of curvature of 1.3 mm to 4 mm and is 2.5 mm to 10 mm thick from the apex to the interface.