QDK automatic dynamic crack resistance Tester user manual

I. scope

Due to the dry and wet climatic changes of the building uneven, thermal expansion and contraction, settlement structure and design, incomplete construction reasons, almost all the construction all the surface capillary cracks, surface through cracks, structural cracks.

Cracks in exterior walls not only greatly reduces the protective effects on the external walls of buildings, also have some implications for finishing surface appearance. In order to compensate for these defects before the paint emulsion paint for exterior wall, the first wall coated in a layer of PuTTY for exterior wall; The quality of PuTTY for exterior wall and is the key of the key.

According to JG/T157-2004 standard design and manufacture of automatic dynamic QDK cracking resistance test is suitable for testing cement, polymer powders, synthetic resin emulsions or other materials as the main Binder, mixed with fillers, additives and other components of the leveling PuTTY for exterior wall.

II. working principle

Drag the ejector motor through gear reducer for upward motion, uplift of the cutting edge, asbestos cement gradually produces fine cracks in designated areas, and slow crack growth control, observe the cracking of PuTTY, PuTTY for this characterization of resistance to crack of the substrate.

III. main specification

1. blade length: 150mm

2. cutting edge angle: 30 degrees

3. maximum lift: 20mm

4. ascent rate: 3mm/min

5. specifications type box: 200x150x2 (mm)

IV. test method

1.-the box in 200x150 (mm) on the asbestos cement sheets. In the prepared PuTTY-coated in the box.

2. box removed, coated good asbestos-cement board should be in a standard environment conservation 7d. Each sample should also prepare a 3 plate.

3. the conservation plate Kaku in the instruments on your work surface. Starting start up after the power switch switch, then edge up slowly.

4. cutting edge continues to creep up. Should observe the asbestos sheets blank area at this time, when cracks appear, use vertical reading microscope to observe and record crack width, up to PuTTY before cracking. The start-stop switch, the blade is no longer increasing.

5. record PuTTY before cracking, maximum width of cracks in asbestos cement. Accurate to 0.02 mm.

6. start drop switches, edge back in place.

7. loosen the plate fixing nut and plate and remove the plate. Put another piece of plate, repeat the above steps.

V. results

Three plates to each plate closer to the value of the arithmetic mean of the test results as the final result.

VI. precautions for use

1. PuTTY scraping should ensure the smooth surface without air bubbles.

2. Remove PuTTY should be aware of when edge of the box should not be cracked or damaged.

3. use a reading microscope readings, cutting edge should not be abdicated to prevent asbestos-cement board back.