Manual of test hammer
Contents
1. ta wos 57 1 44 6 42 6 arjo fae for 19619412158 23 475 351 s 198186182157 476 95 e 554 saj 187151 15351395 85 346 E E 539 399 387 364 945 14 User Manual for Concrete Test Hammer Compressive strength Mpa Carbonation2. wy GT GT Go wj GT 0 tal Cal S My Ny oo a 8 34 5 36 4 34 9 92 aos as 357 309 295 287 aoe ass 301 29 243 ar 255 244 252 JELE mom 95 Ww 567 347 6 396 374 36 248 231 92 399 94 39 376 367 35 34 94 203 30 392 302 394 39 6 407 39 1 3 364 352 242 pes 366 354 244 User Manual for Concrete Test Hammer Compressive strength Mpa Carbo 33 ZE pees 372 365 555 555 wa A e nation depth 26 0 24 7 25 2 25 4 EEE 265 253 a pa po pe 27 8 26 5 29 6 30 2 51 3 513 ara 517 49 6 47 6 45 555 39 39 3 38 38 3 33 3 31 8 37 2 35 2 154 12 User Manual for Concrete Test Hammer Compressive strength Mpa Carbonation depth Po fos pp Ts 547 ESN EEN Ea EE 555 94 50 so as 565 513 4 255 495 387 9 357 39 315 wa 85535 502 aes 58 927 ws gt gt 525 a7 ara 7 7 pos aos
3. User Manual for Concrete Test Hammer Manual of test hammer User Manual for Concrete Test Hammer Directory One How to operate 2 Two Calibrate Test hammer 4 Three Rectification of test hammer 5 Four Maintenance 6 Five Detach and assemble 7 Six Reference information 8 Seven Compressive strength Mpa Rm 10 Test Hammer is a traditional non destructive test instrument that is used to determine the compressive strength or hardness of hardened concrete or rock It provides a quick and easy in place test for obtaining an immediate indication User Manual for Concrete Test Hammer One How to operate During testing keeping test hammer perpendicular to test surface Operation procedures as follows Step 1 Generally test hammer was locked during storage we should unlock it before a test Take out test hammer keeping the rebound pole perpendicular to a surface any hard Pushing test hammer on end cover slowly the hammer will unlock and the button will bound out stop pushing removing the test hammer away from the surface rebound pole will reach out and at the same time the rebound hammer will be hooked because of the pushing from compression spring now it s ready for a test Step 2 Aim at test point keep perpendicular push slowly rebound pole will be pushed into the test hammer at the same time the compressing spring get compressed but the tension spring get stretch and uptight keep pushing till reb
4. ammer Compressive strength Mpa Carbonation depth mm N 3 142 142 17 1 7 4 77 2 5 14 6 14 9 15 1 15 3 15 6 FRE N NIN 5 x 14 8 14 6 14 13 6 13 1 12 4 N 15 1 14 427 13 7 14 8 14 4 13 9 132 13 N _ 99 N in bo NIN w N N 92 94 9 6 9 8 Ww 0 2 0 4 0 6 0 8 1 1 2 1 4 31 6 31 8 2 2 2 32 4 32 6 Ww 92 33 aS SIX 95 aS 519 aja eee 158 16 1 1 164 4 16 6 IEE 195 20 20 3 206 20 9 1 212 20 214 20 217 22 22 3 21 61 225121 146 4 149 15 8 162 15 164 15 2 166 16 4 168 16 Terps 183 17 186 17 18 8 18 19 1 18 19 3 18 196 18 19 8 19 202 19 JERE 22 3 21 A 226 21 7 22 9 22 S S 5 5 a 6 16 1 9 16 4 16 6 9 182 1 2 18411 5 18 6 1 7 18 8 o 19 1 18 2 194 18 5 196 18 8 19 9 1 20 2 19 3 204 19 6 20 7 opari afas T ll User Manual for Concrete Test Hammer Compressive strength Mpa Carbonation depth mm 352 1 JEA 2 4 7 2 4 6
5. ep the instrument from fall water drop collision and other damage C Test must be performed on smooth and uniform surface obtained from castings Avoid uneven and porous surfaces lumps of gravel and joints in the concrete Tests on thin sections or zones less 10 cm wide require particular care in the interpretation of the results because of the distortion due to the elasticity of the section If possible the back of the section should be held stiff by some means D It is advisable to take more than 12 readings in order to obtain a reliable average value Rm Interval between each test points should be 2 or 3 cm Note The compressive strength Mpa against the Rm average rebound values please refer to the chapter seven User Manual for Concrete Test Hammer Two Calibrate Test hammer Every instrument needs calibration or adjustment after long time use According to the standard regulation we can calibrate test hammer by a standard calibration steel anvil The calibration steel anvil for the test hammer must with hardness of HRC58 62 Calibration is simple but important and indispensable Calibration circumstance dry and room temperature 5 35 Procedure Calibrating test hammer just like a test but the analyte is the steel anvil Operation test hammer on steel anvil and inspect the rebound value a qualified test hammer can get a value of Rm 80 2 Calibration values are differ according to differ test hammers Test hamme
6. etch 75 0 3mm The static friction of pointer slider 0 65N 0 15N Radius of spherical tip 25mm lmm The average rebound values on steel anvil 8042 Housing dimensions 54 280mm Weight 1Kg Submit to industry standard JGJ T23 2001 lt Technical Specification for Inspection of Concrete Compressive Strength by Rebound Method gt Summary be User Manual for Concrete Test Hammer Test surface Rebound pole Dust felt ring Semicircular clasp Tension spring Body B Fixer Scale Pointer axis Center rod Shrapnel Pointer slider Guide flange Hook spring Fixer 2 End cover Compression spring Tighten nut Adjust bolt Hook Master lock Position lock hook Button nut Button block Button spring Shell Rebound hammer impact hammer Spring circle buffer spring Spring block Cover cap Figure 1 26 27 30 28 29 Structure of Test Hammer HT225 Figure 2 Gauge User Manual for Concrete Test Hammer Seven Compressive strength Mpa Rm Rm opp epe e 5155 Bao 9 93 for 2 195 Ee EE oa 96 ut 10s or 208 Ht fos _ _ osjo para 107 0 2 101 User Manual for Concrete Test H
7. ever we can indirectly check the length by following method User Manual for Concrete Test Hammer Taking out the machine core hook the strike hammer on the hook hanging up pulling the tension spring by spring base till the strike side of rebound pole appears Measuring the distance between two strike sides if the length in the scope of 76 1mm 75 7mm it s OK or need adjust Why the length isn t 75mm in the method That is because we should consider a rectify value from the compression of buffer spring 4 At the end of rectification we need calibrate the test hammer on the steel anvil the test value should be Rm 80 2 Generally before above procedures we should clear the machine core by petrol or alcohol The center pole should be wiped with little watch oil Four Maintenance In order to keep good accuracy we should be careful in operation and storage Daily maintenance is strong recommended 1 Before put test hammer back to the suitcase after each test work we should clear it too much dirt will influence accuracy even make the instrument out of work 2 Do not play test hammer for fun or test unclear metal object 3 Generally clear the machine core is definitely good after long time use or after used in dirty place Clear it by petrol or alcohol and wipe watch oil on center pole at the end calibrate it on the steel anvil During a large number of tests we should keep regular maintenance User Manual for C
8. oncrete Test Hammer Five Detach and assemble Making test hammer against hard place push end cover till the button loose stop pushing and let rebound pole reach out of the device slowly Screw off end cover and take out the compression spring screw off the cover cap detach the semicircular clasp Keep the device upright the rebound pole downwards move the core component to tail hold the hook and unhook the rebound hammer take out the core component Note it must be unhook firstly when you take it out or set it back Detach the core component impact rebound pole lightly by rebound hammer rebound pole will leave from the center rod don t miss the buffer spring In general situation the three components rebound hammer tension spring and spring base shouldn t be detached in case the tension spring transformation Screw pointer pole by opener from the end of the instrument the pointer pole will separate from a front fixer keeping screwing till pointer pole separate from pointer slider Generally we don t have to detach the gauge Above are detach procedures assembling procedures are opposite against above Of course calibration on steel anvil is indispensable at the end of all rectification and assembling test values should be Rm 80 2 User Manual for Concrete Test Hammer Six Reference information Technical specifications Measuring ranges 10 60MPa Impact energy 2 207 0 17 0 225Kgf m Length of spring str
9. ound hammer unhook the rebound hammer will impact rebound pole by the pulling from tension spring After impact with rebound pole the rebound hammer will be rebounded and take the pointer up the pointer will stop at the highest position and we can know the position by the gauge each position against a value that is rebound value Note that before you record the rebound value DO NOT loose your hand or the pointer will ZERO SET automatically by the push from the compression spring Note If it is difficult to see the reading under the conditions specified in Step 2 lock hammer by PRESS THE BUTTON ONLY AFTER IMPACT and remove the device to a convenient place in order to read the gauge And unlock it by step 1 after User Manual for Concrete Test Hammer reading for another test Step 3 Continue test at other test points Step 4 End of the test push the rebound pole back into the test hammer just like above test procedure After the rebound hammer impact press the button and the test hammer will be lock Then clear it and put back suitcase Remarks A When performing tests on non vertical surfaces and hence not holding the instrument horizontally it is essential to take into account the factor of gravity acting upon the impact shock and the carbonation depth is another factor need taken into if necessary a precise conversion sheet has be provided by manufacturer B Please note that careful operation is helpful to accuracy and ke
10. r p Steel Anvil If you need steel anvil please contact with us User Manual for Concrete Test Hammer Three Rectification of test hammer The device does not require special maintenance Avoid letting dust collect in the rebound pole and penetrating inside the device Also BEWARE of the rebound pole and hammer becoming dirty from oil or dust from the contact surface as this could create errors in the rebound impact In order to keep reliability and good accuracy of test hammer we should rectify the hammer generally and periodically After the test hammer HT 225 was operated each 2000 times or doubt the accuracy of test data we should calibrate it on steel anvil model GZ16 But only by steel anvil to judge that the test hammer be in standard status is not enough following inspections are recommended for double confirmation 1 Testing the max static friction between pointer slider and shaft in the instrument it should be fall in the scope of 0 5 0 8N Or adjust the slider till meet the request 2 Check the effective work length of the tension spring see if it is 61 5mm usually by adjusting the hole that the spring set in can get the suitable length 3 Check the stroke distance of strike hammer rebound hammer That is means the spring will stretch up to 75 mm 75mm should be the length under work status the spring being stretched to longest but it s difficult for us to check the length in the test hammer How
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