What Is The Reason For The Breakage Or Unclear Exposure Of The Dividing Strip Told By The Hangzhou Terrazzo Slab Manufacturer?

The reasons for the breakage or unclear exposure of dividing bars in Hangzhou terrazzo slabs are as follows:

The grid strip inlay is not firm or not lower than the surface layer

If the dividing strip is not firmly embedded in the base layer, or the embedding height is not lower than the terrazzo surface layer, it is easy to be bent or crushed due to uneven stress during the rolling process. For example, when the roller directly crushes the top of the dividing strip, local stress concentration can lead to fracture.
The stones on both sides of the dividing strip were not compacted before rolling
Before rolling, use an iron trowel to lightly tap the stones on both sides of the dividing strip to make it compact. If not operated, there will be gaps between the stones and the dividing bars, and the movement of the stones during rolling will squeeze the dividing bars, causing breakage or unclear exposure.

Improper construction at the junction of grid strips
Incorrect angle and height of bonding paste: When bonding the dividing strip, the thick cement paste should be pasted at a 30 ° angle, and the top of the dividing strip should be 4-6mm away from the cement paste. If the angle is too large or the height is insufficient, the cement paste will cover the top of the dividing strip, resulting in unclear exposure after polishing.
No gap left at the junction: If the cross intersection of the dividing strip is completely filled with cement slurry, there will be no mixing material pores, and stones cannot be embedded. After polishing, pure cement marks will form in this area, affecting the exposure of the dividing strip.
Excessive surface layer thickness or single rolling direction
Thick surface layer: If the thickness of the terrazzo surface layer exceeds the height of the dividing strip, the dividing strip will be covered after rolling and difficult to grind out.

Single rolling direction: Rolling only in a single direction will result in insufficient compaction on both sides of the grid parallel to the rolling direction, leading to the phenomenon of "more slurry and less stone" and unclear exposure.
Material or operational issues
Poor quality of dividing strips: Insufficient material strength (such as glass strips) or dimensional deviation, which can easily break during rolling.
Roller adhesion of stones: During rolling, stones adhere to the roller, and repeated rolling of the dividing strip will exacerbate its damage.