What things should be paid attention to when doing cement mortar floor?

The quality of cement mortar floor construction will directly affect the decoration quality of the entire floor, causing a lot of inconvenience for future life. Therefore, the construction of the ground is more important. However, many people will understand the construction technology of cement mortar floor for the future decoration of the ground, and then decorate the ground. So let me introduce the key points about the construction process of cement mortar floor? What are the details of cement mortar floor construction?

What are the key points of cement mortar floor construction technology?

1. The surface of the base layer should be dense and smooth, and no unevenness and sand formation are allowed. The loose coke slag, cement concrete and cement mortar on the surface of the cushion should be cleaned. One day before the cement mortar is laid, water should be sprinkled to keep the surface moist to a certain extent, which is conducive to the firm combination of the surface layer and the base layer. The next day, brush a cement slurry bonding layer with a water-cement ratio of 0.4 to 0.5, and then apply the surface layer. If the cement paste bonding layer is painted too early, it will not play a role in bonding with both the base layer and the surface layer.

2. The cement mortar should be mechanically stirred, the materials should be fed in proportion, the measurement should be correct, the amount of water added should be strictly controlled, the mixing time should not be less than 2min, the mixing should be uniform, and the color should be consistent. Before the cement mortar is laid, a layer of cement mortar shall be painted on the surface of the base layer as a bonding layer, and the water-cement ratio shall be 0.4-0.5.

3. After paving cement mortar, vibrate. And do a good job of smoothing and calendering of the surface layer, but it is necessary to master the cement mortar to complete the smoothing and calendering before the initial setting of the cement and the final setting.

4. When the cement mortar begins to coagulate, that is, when there are footprints but no sag when the person steps on it, press the steel trowel for a second time, requiring no leakage, and flatten the pits and sand holes. When the cement mortar coagulates, that is When a person steps on it and there are slight footprints but no trowel pattern, the steel trowel can be used for a third time, and the trowel pattern left by the second pass is flattened, compacted and calendered. When using a ground trowel for calendering, the dry hardness of the cement mortar should be slightly drier than that of manual calendering in the second and third passes.

5. When the surface layer of cement mortar is pressed and its dry humidity is not suitable, measures should be taken: if the surface is slightly dry, it should be drenched with water to be calendered; The mixed cement and sand should be smoothed, and the volume ratio is 1:1 (cement:sand), and the sand should pass through a 3mm sieve, but should be spread evenly.

6. When the thickness of the cement mortar surface layer is reduced below 10mm in the case of pipelines, etc., measures to prevent cracking must be taken. Generally, steel mesh sheets are placed along the pipeline direction, or the surface layer can be laid after meeting the design requirements.

What are the details of cement mortar floor construction?

1. First sweep off the dust on the base layer, use a wire brush and a chisel to clean it, remove the mortar skin and ash layer, use a caustic soda solution to brush off the oil stain on the base layer, and rinse the lye solution with water in time. Soak the floor in water for a day

2. According to the +1.0m horizontal control line on the wall, measure the elevation of the surface layer downward, and bounce it on the wall, and then determine the thickness of the surface layer mortar according to the level line of the surface layer. If it is found that the floor is too thin (low If it is more than 50px) or too thick (higher than 125px), it needs to be adjusted, and the adjusted elevation should be marked with fixed paint in the public parts, and then pull the horizontal line to start plastering the cake (5×125px), and the horizontal and vertical spacing is 1.5~ 2. Om, the upper surface of the ash cake is the elevation of the cement mortar floor.

3. Stir the mortar. The volume ratio of cement mortar should be 1:2.5 (cement:sand), its consistency should not be greater than 35m, and its strength grade should not be less than M15. In order to control the amount of water added, a mixer should be used for stirring, and the color should be consistent. Before laying cement mortar, one layer of cement mortar should be applied, and the water-cement ratio should be 0.4-0.5. Do not apply too large an area, and apply mortar along with the paving layer.

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