Due to the insufficient flexibility of the surface layer mortar and the change of temperature and humidity will cause shrinkage and cause the surface layer cracking, when the fiberglass mesh is pressed into the plastering mortar, the fiberglass plays a role in enhancing and dispersing the stress, and it plays a key role in the whole protective layer. Fiberglass mesh must choose alkaline resistant, because the hydration of plaster mortar produces calcium hydroxide, which makes the mortar presents strong alkaline. Ordinary fiberglass mesh is easy to corrosion in the alkaline environment because of the lack of alkali resistant materials ZrO2 and TiO2.
In addition, attention should also be paid to the position of the fiberglass mesh laid in the plastering mortar. If the fiberglass mesh is laid at the bottom of the plastering mortar layer, when the mortar is impacted by the outside world, it cannot timely disperse the impact of the mortar, resulting in mortarcracking. If fiberglass mesh laid in the outer layer of mortar, when mortar by the external impact, fiberglass mesh can timely disperse mortar stress. Mortar specimens must accumulate enough energy to overcome the energy consumed by fiberglass mesh, thus to a certain extent limit the production and development of cracks. specimens will no longer appear cracks.
