BRIEF INTRODUCTION A test hammer impacts, with a predetermined amount of energy, a steel plunger in contact with a surface of concrete, and the distance that the hammer rebounds is measured. Along with the development of construction, high building, skyscraper becomes more and more, application of high strength concrete also becomes more popular in the future, which needs a special test hammer to test high strength concrete. HT-450 test hammer was developed from HT-225, used to test high strength concrete, and test range is 20~110Mpa. Specifications 1,standard impact energy 4.5J 2,impact spring stroke 100mm 3,impact spring work length 106mm 4,impact spring stiffness 900±40N/m 5,calibration value 88±2 6,sphere radius of impact pole SR35mm 7,NW 1.28kg 8,size 54×350mm

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