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The pad cement self-leveling mortar foreword
self-leveling mortar is a flowable system that provides the laying of the final finish layer (e.g. process flooring, wooden flooring, etc.) or its own final finish layer (clear water layer) and has flow-leveling properties. Its key performance requirements are fast hard and low shrinkage. Often used in residential floor leveling, industrial flooring, underground parking lots and other high leveling requirements of the indoor environment, especially large areas of
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If used as a cushion material for an intermediate transition layer, it is generally referred to as: cement-based self-leveling (pad layer), and if it is used as a surface material for the final covering layer, it is generally referred to as: cement-based self-leveling (surface layer).
Mortar industry has been circulating a sentence: "three materials, seven division of labor", and in the cement self-leveling mortar construction can be most verified, and even we can say that cement self-reliance flat mortar construction, should be "two materials, eight division of labor!" "Then the following for everyone for cement self-leveling mortar floor construction of the specific steps, analysis.
cement self-leveling mortar ground construction steps are
. 1. Grass-roots treatment and grinding process
First of all, should remove the surface slurry and stains, can be properly cleaned and cleaned with water, such as the presence of obvious empty drums and cracking at the grass-roots need to be treated in a timely manner, to prevent the impact of subsequent construction steps. After grinding the substation to be strong, clean as the standard, it is best to use a grinding machine for the ground for grinding treatment.
2. Permeable reinforcement substrate
(1) in the absence of water residue on the ground, began to brush reinforcement with nano-permeable solidification agent, nano-permeable material, brushed on the substrate, through nano-penetration to strengthen the substrate, to prevent the effect of floating ash and other magazines on adhesion.
(2) If there are more cracking cases and more concentrated in the substrate, the cracking site can be reinforced with the square of anti-cracking polyurethane bottom coated with anti-crack glass fiber mesh cloth, so as to avoid defects caused by cracking. The next process can only be carried out after curing.
3. Interface bottom coating construction
choose a special interface agent from the leveling, according to the needs of 1:2 or 1:3 ratio of dilution, the use of rolling or brushing, uniform coating in the treated area to be constructed, in the first coating After the brush is dried, a second brush is carried out (e.g. when the base pores are particularly many, can be painted three times), this step of construction is mainly to avoid the low-level closed bad pinholes and bubbles phenomenon, and for the self-leveling mortar to provide sufficient adhesion and bonding force.
4. Pad self-leveling mortar construction
(1) high requirements of on-site mixing
first the mixing water into the mixing bucket, and then the self-leveling cement mortar material, poured into the barrel. Then in accordance with the provisions of the water to mix into a suitable slurry, using a mechanical mixer to stir at medium speed, stirring for 2-3 minutes, then stop for 1 minute, and then stir for 1-2 minutes. On-site water addition needs to be strictly controlled, to mortar to reach a free flow state without water is appropriate. After the completion of the ingredients, test the flow of the mortar, requiring 0min, 20min mortar expansion ≥ 130mm qualified. The construction uses manual pouring or mechanical slurry.
(2) mortar paving and foaming work
mortar sent to the area to be built, the mortar even flow on the construction surface, construction workers can use the toothedknife auxiliary leveling, and with de-foaming rollers to eliminate bubbles, but also can use self-leveling mortar special needle-shaped push plate for pulp deblistering, for easy access to the ground paving and de-foaming process, construction personnel need to wear special nail shoes.
5. Surface surface construction
Usually, after 3 days of self-leveling ground maintenance of the mat layer, you can enter the surface construction process, recommended to use water-based polyurethane materials. The preparation of the cover material in accordance with the primer layer - medium paint - surface paint in order in accordance with the requirements of the construction, in order to improve the ground wear resistance and scratch resistance, and make the ground easy to clean, improve the life of the floor. High-quality surface wear-resistant high-strength self-leveling products can also be used.
6. Construction points
. . . if the substrate is particularly dry and absorbs water is particularly large, water may be used: the back cover interface agent , 4:1 mixed material on the ground for adequate wetting of the back cover, drying and then use the interface agent for the next back cover process. When painting the back cover, do not leave a dead end, to avoid retaining pores leading to the impact of self-leveling mortar surface effect.
. Self-leveling mortar is very sensitive to water addition, but not static, need to be fine-tuned up and down the reference water consumption, to avoid water added more or less caused by dissociation or viscosity, in order to just reach the free flow state and the surface without water or water ring is appropriate.
construction area shall not exceed 6m x 6m (length and width shall not exceed 6m), and the area shall be divided when the area exceeds.
ensure that the construction environment is indoors, windless and without direct sun exposure. After the initial coagulation (approximately 30-60 minutes after construction), before the final coagulation (approximately 2-5 hours) personnel are prohibited from entering the site to trample and avoid human disturbances.
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