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When paving wall tiles, cement mortar is used as the bonding agent. The wall bricks have high water absorption rate. If there is no water soaking beforehand, the porous ceramic tiles after the paving will absorb the moisture in the cement mortar. Cement requires a lot of water during the curing process. Since it loses water, it has no adhesive force and no strength. The bricks are accompanied by cement mortar and fall off the wall together.