First, the laying area is large. We can see that when laying granite bricks, its area is very large. Laying granite bricks on the square is very prone to poor flatness and local depression of the building surface, which will directly affect the decorative effect of the square and cause certain difficulties for the maintenance of the staff. In order to avoid this situation, it must be laid as required, and it must be compacted repeatedly with a roller. Then use water and sediment to lay granite bricks. However, some projects cut corners and save many steps, which will make a lot of loose granite bricks appear in the square.
Second, the people in the pedestrian square are still very active. Grandparents like to dance square dance in the square, and children like to chase and fight on it. Due to human activities, sun and rain, and the expansion and contraction of the brick, the underlying cushion will loosen, leading to the loosening of the brick. The square is used for activities, and the frequency of use will not decrease. It is best to compact when laying, which can prolong the service life of granite bricks.
Third, the tile itself has many tiny cracks in the granite brick, so it has certain water absorption. If you don't soak in water or if you don't soak in water fully and directly, the tiles will take away the moisture of the cement, thus causing cracks or weak bonding at the joint with the cement. In order to avoid this situation, before paving, all granite bricks need to be immersed in water, and then pasted after being fully soaked. Of course, there are also cases where workers operate irregularly.