Practical Rock Engineering Chapter 14 Rockbolts and Cables
2018-9-21 · Steel bar diameter: 20 mm Ultimate tensile strength of steel rebar: 18 tonnes Faceplate: flat plate Borehole diameter: 32 mm Cement grout: 0.35 water/cement ratio grout cured for 11 days. At a load of 15 tonnes and an elastic deformation of about 1.5 mm, a sudden load drop is characteristic of hot rolled rebar steel.
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