（5） Floor mosaic paving construction
1. Paving process flow:
Preparation before paving: plastering and scraping of base course mortar, member arrangement, paving, product protection, and mortar curing.
(1). preparation before paving. Remove the garbage and floating dust on the working surface, spray water to wet the ground, and prepare for scraping the bottom slurry; Perforation of the dorsal mesh. The dorsal reticulum l poked through the gap of particles; Coating the interface agent. Brush the interface agent on the mosaic back screen.
(2) Wipe and scrape the slurry. Correctly estimate the amount of primer, and scrape the mixed slurry on the base surface.
(3), mosaic plate. The components must be pre-arranged and verified according to the pattern requirements before paving, and the splicing of the pattern, the size of the joint, and the size reservation of the component installation surface shall be clear in the chest, to prevent stripping after wrong paving and particle falling off.
(4). paving requirements. After the components are compacted, the bottom slurry shall be able to pass through the mesh and bond to the lower part of the particles, as shown in Figure 5; Due to the need for polishing in the later stage, the overall component paving size should be 0.2cm higher.
(5). product protection. Product protection includes three aspects: first, the newly laid components should be prevented from being trampled and polluted; The second is to prevent cement mortar and adhesive materials from polluting the mosaic surface and gap; The third is to prevent sharp objects from scratching particles.
(6). primer curing. The curing period of the bottom slurry of the mosaic is long, to ensure sufficient curing period and release the water vapor in the bottom slurry to meet the requirements of the next construction process.
2. Integral grouting reinforcement construction
The key point of the overall grouting reinforcement construction of the marble mosaic floor is to control the liquid gel property and carry out the sub-grouting construction. The control of liquid adhesive properties mainly refers to three aspects:
In terms of the permeability of liquid glue, the thinner the glue, the stronger the permeability. The maximum dilution ratio of raw glue and diluent is 1:1, which has sufficient permeability;
In terms of the shrinkage performance of colloid, the thinner the colloid, the greater the shrinkage, which requires the constructor to select different concentrations according to different needs and control different shrinkage
To ensure the penetration time of glue, it is more appropriate to start curing 1h after grouting. The concentration of grouting material is determined according to the condition of components and the effect of penetration and cementation.
The sub grouting construction is carried out according to the effect of penetration reinforcement, that is, the diluted slurry shall be selected for the first grouting to make it have sufficient permeability; Liquid raw glue can be used for the second grouting;
If the shrinkage of the colloid is large, the third glue filling can be carried out; Finally, for large depressions, use the joint sealant with brightness after grinding to make up the leakage. Special attention should be paid to that the glue filling construction must not be completed at one time. The colloid filled with enough slurry at one time is too thick, which is easy to cause that the solvent in the lower colloid cannot volatilize, form surface solidification, and the lower part is always soft.
Therefore, the glue pouring construction can only follow the sub-construction procedures of grouting, curing, regrouting, and recuring.
The construction process of grouting reinforcement: surface cleaning, painting oil proof materials, curing, one-time thin glue pouring and curing, the second glue pouring and curing, surface repair and curing.
(1) Clean the surface.
Before grouting construction, the floating dust on the surface shall be removed. A dust suction head with a brush head (brush can reduce the suction) can be used to absorb the floating dust on the mosaic surface and in the gap to ensure adhesion.
(2). apply oil-proof protective materials.
Due to the variety of joint sealant and stone particles, oil protection shall be done to prevent the stone from being polluted and discolored (solvent colloid has an oil leakage effect on some stones). Quick-drying acrylic resin (to be specially prepared) can be used to protect the components from oil leakage.
(3). dilution of joint sealant and dilution of color matching joint sealant
The joint sealant poured for the first time shall be diluted to facilitate the penetration of bottom slurry pores and particle tight joints (samples shall be prepared in advance to control the penetration time, curing time, and shrinkage). Color matching of caulking glue. The glue color of the mosaic gap is opposite to that of large plate caulking. The glue color of mosaic should not only set off the characteristics of stone particles but also feel whether the matching of the stone color and glue color is appropriate or not.
Before configuring the color of rubber, the opinions of the general contractor and even the owner must be obtained, or a sample plate must be made for selection and determination, as shown in Figure 6. Uniform color shall be configured for liquid glue and caulking glue.
(4) Similarities and differences of secondary grouting and grouting construction
① Similarities and differences of secondary glue filling.
The glue concentration of the secondary grouting is different: the diluted glue is used for the first grouting, although the amount is large, the shrinkage is large, and the liquid raw glue can be used for the second grouting;
The function and purpose of filling joints are different: pouring thin glue is conducive to the penetration and cementation of bottom slurry pores and tight joints, and pouring raw glue is to fill gaps and strengthen the overall strength of components; In the same operation mode, the curing time of the compound is roughly the same (curing starts in about 1H).
② Joint pouring construction.
The construction method of diffuse scraping is adopted for glue filling. Pour an appropriate amount of glue on the working surface and wipe it back and forth with a plastic scraper several times. 24h after the first glue filling, the second glue filling can be carried out (the second glue filling can be full seam).
After the secondary glue filling is cured, it can be determined whether the third glue filling is required according to the shrinkage of the joint glue. After glue filling; For the part with a large gap and insufficient sealant, the sealant with brightness after grinding can be selected for repair.
(5). wide joint batch repair construction.
The 2cm mosaic gap is generally standardized, which can be filled with primary glue and base slurry for cementation, and then directly repaired with special joint sealant with brightness after grinding. The colloid is slightly higher than the stone surface.
(6). joint filling construction with adhesive.
For the working surface with low requirements and standardized joints, the adhesive containing glue can be used to fill the joints. The disadvantage is that the adhesive particles are coarse and the pores are relatively large, which is easy to be polluted into black joints in the future; The strength is not as good as that of pure adhesive, and the flatness grinding construction cannot be carried out on the working surface.
