The cement self-leveling ground can be changed into a free-flowing slurry after it is filled with water. According to the uneven terrain, it can quickly expand on the ground and obtain a high flatness floor from the surface. The following small series briefly introduces the construction steps of the cement self-leveling floor .
·What is cement self-leveling ground
The self-leveling ground is made up of water by adding water to the material, and it can be turned into a free-flowing slurry, which can be quickly spread on the ground and obtain high flatness from the surface according to the uneven terrain. The cement used for self-leveling floors generally uses Portland cement, high alumina cement, and Portland cement.
· Cement self-leveling floor construction steps
(I) Grassroots treatment:
1. The strength of the grass-roots concrete before construction shall be ≥C20. Place where unevenness, cracks, and holes should be smoothed beforehand, and then the scattered debris on the base surface shall be removed. The surface must be kept hard and smooth.
2. Wet and wet the primary concrete surface and ensure that no water adheres to the front layer.
3. The ordinary cement new concrete base layer shall be self-leveled after 21 days of construction. The new concrete base layer of sulphoaluminate cement construction shall be self-leveling construction only 7 days after completion.
(II) Interface processing:
1. If it is a smooth base, it is recommended to do the cutting or pulling. It is recommended to use EC-1 surface treatment agent. When using it, mix according to the ratio of EC-1:water:cement:fine sand=1:1:1:1, brush or spray on the base surface. The EC-1 reference dose is 0.2-0.3 kg/m2.
2. When the surface is not sticky, self-leveling construction can be performed.
(iii) Stirring:
1. Small area or highway construction, small electric stirrer (200-500 rev/min) can be used to stir in the barrel, and the complete packing material is required for each stirring. When large-area construction is performed, high-speed mixer can be used to stir the mortar. Pumping method construction.
2. Pour the appropriate amount of clean water into the bucket, turn on the stirrer and slowly add a packet (preferably within one minute) while stirring. Stir for 4 to 5 minutes. After about 1 minute of rest, stir until uniform The paste can be.
3. In cold conditions, it is preferable to stir with warm water (not more than 40°C). The temperature of the mortar is kept above 5°C.
(iv) Pouring and levelling:
1. Pour out the mixture well and evenly spread. Use a special tooth scraper to control the thickness. The thickness of the product should be ≥ 3mm, and the thickness of a single application should be 3 to 30mm. The reference dosage is 1.6kg/m2/mm.
2. The construction personnel can wear the spiked shoes to enter the construction ground and use a tooth scraper to scrape the surface of the mortar to eliminate the unevenness of the collapsed joint and maintain the required thickness.
3. Gently roll with the deflation cylinder to eliminate air bubbles from mixing.
4, mix well should be used within 35 minutes.
(v) Conservation:
Under normal temperature conditions, maintenance is not required. Under conditions of high temperature or low temperature, watering or covering wet sacks, straw mats, etc. shall be adopted after curing for 1 to 3 days. Heavy traffic grounds need to be maintained for 3 days before passing.
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