Self-leveling mortar construction manual (cushion)
1. Flatness: The height difference should not exceed 2m / 3mm
2. Strength: > C20
3. Water content:
4, the surface can not be sand, hollow, crack
5, ordinary cement new concrete base layer, need to be in portant; border-bottom-color: rgb (0, 0, 255); border-bottom-width: 1px; border-bottom-style: solid; padding: 0px 2px;"> Construction 14-21 days (summer) 28 days (winter) (depending on the situation) after self-leveling cement portant; border-bottom-color: rgb (0, 0, 255); border-bottom-width: 1px; Border-bottom-style: solid; padding: 0px 2px;">Construction. The new concrete base layer of aluminum sulphate cement construction can be self-leveling cement construction 7 days after completion.
Grassroots processing:
The floor should be flat, dry, strong, free of dust and dirt
1. If the surface is loose, the surface loose material should be completely removed and the floor should be thoroughly cleaned or treated with an interface agent.
2. If there is a crack on the ground, the crack must be repaired with Libang XD-2055 moisture-proof interface agent.
3, the base layer of the whole must be removed with a steel brush or sanding machine, so that the thickness of the ground and its side is not more than 2.0 mm
4, there are potholes or grooves to portant; border-bottom-color: rgb(0, 0, 255); border-bottom-width: 1px; border-bottom-style: solid; padding: 0px 2px; Or putty first
5, wet ground must use interface agent to do moisture treatment
6. The interface agent must be cleaned with a vacuum cleaner to remove the surface ash and particles.
Construction process:
Clean the ground - check the ground - the ground ground - sweep the ground - brush the interface agent - stir self-leveling - scrape self-leveling - self-leveling defoaming - drying - sanding self-leveling
The interface treatment must be applied to the base layer before construction. The absorbent surface should be treated with an interface treatment to prevent self-leveling from drying too quickly. Non-absorbent surfaces such as steel plates, asphalt, stone, bricks, paints, etc. should be treated with a non-absorbent interface to ensure good bond strength.
Construction steps and points
First, the grassroots processing
First use a special blade to remove the original gypsum, paint, cement, lumps and other protrusions on the ground. Use self-leveling cement to mix the interface agent to level the pits of the ground surface; cracks and gaps are repaired with interface treatment agent. Make the ground leveling requirements. Then grind the entire ground with a sander to ensure that there are no protruding and loose ground on the ground, then dry the flattened ground naturally, or quickly dry it by heating. Make the entire ground moisture rate not More than 6%; then use the broom to clean the ground and all corners; use a level measuring instrument to combine the surface of the surface with a particularly high point of chalk, and then use a sander to finish the grinding at this high place. The difference between the thickness of the ground and the side of the ground is not more than 2.0 mm. Finally, the large-scale industrial vacuum cleaner is used to completely absorb the ground of the construction, and it is necessary to remove tiny particles.
Second, the brush interface agent
The purpose of the interface agent is to increase the bonding strength between the base layer and the self-leveling cement, and to prevent the moisture in the self-leveling from being absorbed by the base layer, thereby affecting the strength of the self-leveling. According to the requirements of different manufacturers, some water can be added to the interface agent. The proportion of water can be added according to the manufacturer's recommendations. After adding water, be sure to stir it thoroughly. Then use the lint-free roller to supply the bottom oil according to the manufacturer. The amount of application is evenly applied to the surface, and the particularly dry ground can be applied in two separate ways. The amount of the interface agent is the same as that of the first application. The interval can be determined according to the discoloration.
Third, stirring
The preparation work before mixing must be sufficient. It is best for a group of construction personnel to reserve multiple buckets, three of which are used for mixing, one for water, one for water, and the water bucket must be accurate. The self-leveling water distribution ratio of each manufacturer is not the same. Please add water according to the water ratio provided by the manufacturer. The agitator must choose a high-powered agitator, the power is preferably more than 1000 watts, and the speed can be adjusted. It can be placed on the low-speed gear at first, because the initial centrifugal force requires a large centrifugal force, and the cement can be placed after the cement is completely integrated into the water. Stir for 2-3 minutes on the medium speed gear. The mixing head is best to use a special self-leveling mixing head, because the mixing head not only has the rotating force, but also the shearing force, can fully mix the self-leveling cement, and the barrel wall There will be no self-leveling cement block. After mixing 4-6 barrels, the mixing bucket and mixing head should be cleaned to prevent self-leveling from condensing into a block on the barrel wall and the mixing head. The diameter of the mixing head is selected according to the selection. The inner diameter of the barrel. In general, the inner diameter of the barrel is 2.5 times the diameter of the mixing head.
Fourth, leveling and defoaming
Self-leveling construction must be carried out continuously and any cross-construction is prohibited within 24 hours. After self-leveling cement mixing is completed, the cement in the barrel should be poured into the construction site as soon as possible. If self-leveling of 2MM thickness is used, self-leveling tweezers can be used for scraping, because the tweezers can evenly control the construction thickness of self-leveling; Do self-leveling above 3MM, you can use the self-leveling big spatula. After self-leveling on the ground, you should use the deflated roller to dissipate and defoam as soon as possible. Scratch and defoaming construction personnel must wear spikes. The self-leveling construction personnel retreat backwards while constructing, paying attention to the height difference between the self-leveling cement in each barrel.
Five, fine grinding treatment
The perfect self-leveling construction is inseparable from the grinding machine. After the self-leveling construction is completed, the self-leveling surface may have small bubbles, particles and floating dust. There may also be height differences between the doorway and the hallway. In these cases, a sander is required for further leveling. The roughing and fine grinding of the sander is very helpful in saving the materials of the entire project. Rough grinding can reduce the amount of self-leveling used, and fine grinding can reduce the amount of glue used in later projects.
Six, matters needing attention
1. Do not mix cement self-leveling materials with other materials.
2. It should be used in time after opening the package.
3, construction temperature: 10 ° C -35 ° C temperature is too low, resulting in self-leveling slow curing, affecting the intensity; too high temperature, resulting in water evaporation too fast, self-leveling curing is not sufficient, the same will affect the strength.
4, the relative humidity should be between 50-85%, the humidity is low, the water evaporates quickly, the curing is not sufficient; the humidity is too high, the moisture can not come out, it will also affect the self-leveling curing.
5. On the geothermal ground, the geothermal system should be turned off for more than 48 hours before construction, and in winter, the heating will be halved (the ground temperature is about 20 °C). The temperature can be adjusted to the required level after three days of laying.
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