What are the common defects of concrete flooring

Hello, Changsha Hengguang flooring to tell you where the defects of concrete flooring:

1, hollow drum

Testing method: tapping the floor with a small hammer, marking the part of the hollow drum

2, the surface cracks

Testing method: visual inspection

3, not enough strength

Testing method: using a strength tester test, the strength of 20Mpa or more

4, poor surface maintenance, sanding and powdering serious Requirements for more than 20Mpa

4, the surface maintenance is not good, sanding powder serious

Testing method: metal objects or hard nylon brush scraping floor

5, the surface of the pollutants such as oil

Testing method: visual inspection

6, the surface of the humid

Testing method: humidity tester

Using the 1Mx1M plastic film on the ground, surrounded by tape 8-24 hours,

Observe the film bone with or without water droplets or the ground with or without moisture.