Gypsum-based self-leveling mortar belongs to the field of special mortar, and its construction technology is particularly important. It is related to the performance of its performance and the quality of the project. The specific construction application rules are:
(1) Basic treatment.
Clean up the damaged parts, dust, and easy-to-peel plaster layers on the concrete base surface that needs to be poured with self-leveling mortar. If there are cracks or holes on the base surface, it should be repaired, and it should be polished with a rotary grinder and vacuumed. Use a level to measure the level of perfusion on the base surface. And mark it in a place that can be controlled, and apply the interface agent evenly.
(2) Preparation of slurry.
Pour the gypsum-based self-leveling mortar into the mixing bucket with a certain amount of water added. Stir with a portable mixer for 2-3 minutes, rest for 3 minutes, and stir again for 2 minutes to reach the desired consistency.
Immediately pour the stirred slurry. Once poured to reach the desired thickness, then use a trowel or a special toothed needle scraper to spread out. Then use the deflation roller to roll and deflate, and scrape off the small air bubbles on the surface at the same time.
It is strictly forbidden to use the gypsum-based self-leveling mortar within 24 hours after completion.
After the gypsum-based self-leveling mortar is completed, the room should be ventilated and dehumidified. But to avoid drafts, make the ground dry too fast and produce dry.
During the maintenance period, it is strictly forbidden to soak the ground with open water.
(4) Precautions for construction.
During construction in summer, direct sunlight on the ground should be avoided. The slurry mixed once must be used up before the initial setting. Do not add water to the slurry after initial setting, otherwise cracking, pulverization, no strength, delamination and other phenomena will occur.
Gypsum-based self-leveling mortar should be protected from moisture during transportation and storage.
Landcel HPMC for self-leveling mortar