DKL automatic dynamic anti cracking tester Introduction: Due to uneven changes in dryness and wetness, thermal expansion and contraction, structural settlement, and imperfect design and construction of buildings, almost all buildings have varying degrees of surface capillary cracks, surface through cracks, and structural cracks. The cracks on the exterior walls not only greatly reduce the protective effect on the building's exterior walls, but also have a certain impact on the aesthetic appearance of the painted surface. In order to compensate for the above-mentioned defects, before applying exterior latex paint, it is necessary to first apply a scraping layer of exterior wall putty on the wall; The quality of exterior wall putty is the key factor. DKL type automatic dynamic anti cracking tester designed and manufactured according to JG/T157-2004 industrial standard is used to test the leveling putty for exterior wall composed of cement, polymer powder, synthetic resin lotion or other materials as the main binder, filler, additives, etc. working principle: The motor drives the top rod to move upwards through gear reduction, generating an upward force at the cutting edge. This gradually produces fine cracks in the asbestos cement board within the specified area and controls the slow propagation of the cracks. The cracking of the putty layer is observed to characterize the ability of the putty to resist the propagation of cracks in the substrate. Technical parameters: Blade length: 150mm Blade angle: 30 ° Large lift: 20mm Rising rate: 3mm/min Frame specification: 200 × 150 × 2 (mm) usage method: 1. Place the frame on a 200 × 150 (mm) asbestos cement board. Then apply and scrape the prepared putty inside the mold frame. 2. Remove the frame and place the scraped asbestos cement board in a standard environment for 7 days of curing. Three test boards should be prepared for each sample at the same time. 3. Fix the well maintained test board on the workbench of this instrument, turn on the power switch, and then turn on the up switch. At this time, the blade slowly rises. 4. The blade continues to rise slowly. At this time, attention should be paid to observing the blank area of the asbestos board. When cracks are found, use a vertical reading microscope to observe and record the crack width at any time until the putty layer cracks. After activating the stop switch, the blade no longer rises. 5. Record the large width of cracks in asbestos cement boards before the putty layer cracks. Accurate to 0.02mm. 6. Activate the descent switch to retract the blade back to its original position. 7. Loosen the fixing nut and pressure plate of the test board, and remove the test board. Place another test panel and repeat the above test steps.
Introduction: Due to uneven changes in dryness and wetness, thermal expansion and contraction, structural settlement, and imperfect design and construction of buildings, almost all buildings have varying degrees of surface capillary cracks, surface through cracks, and structural cracks. The cracks on the exterior walls not only greatly reduce the protective effect on the building's exterior walls, but also have a certain impact on the aesthetic appearance of the painted surface. In order to compensate for the above-mentioned defects, before applying exterior latex paint, it is necessary to first apply a scraping layer of exterior wall putty on the wall; The quality of exterior wall putty is the key factor. DKL type automatic dynamic anti cracking tester designed and manufactured according to JG/T157-2004 industrial standard is used to test the leveling putty for exterior wall composed of cement, polymer powder, synthetic resin lotion or other materials as the main binder, filler, additives, etc.
