3、 Discussion on construction method of ground marble mosaic
Through the understanding of the two traditional and currently applied pavement effects, it can be said that although the two construction methods are very similar, the results are very different. Therefore, the author believes that under the premise of being unable to change the production of marble components, the construction technology should be studied and formulated according to the characteristics of marble mosaic:
First, we should improve the paving method and strengthen the bonding between the base slurry and components;
Secondly, carry out overall grouting and reinforcement on the working face;
Third, the uneven particle surface after pavement reinforcement shall be polished for overall flatness and re-polished.
The three processes are constructed in sequence, which can achieve the construction effect of firm components and a beautiful finish.
The specific operation process is as follows:
（1） Improvement of pavement process.
The purpose of pavement process improvement is to improve the adhesion to components. First of all, use the slurry containing glue and fully grasp the thickness of the bottom slurry, even if it has sufficient bonding thickness to the back net, and leave an appropriate margin to squeeze into the particle gap;
Secondly, the back mesh at the closed particle gap shall be penetrated, and the bottom slurry can be pressed into the gap and bonded with the mosaic in real-time; Third, the back net of the component is coated with an interfacial agent to increase the adhesive force.
It should be noted here that due to the current requirements for the color of the seam material, the overflow and bonding of the primer are limited to the lower half of the mosaic particles. Therefore, in the process of pavement, increasing the adhesive force and controlling the amount of primer are the key points.
（2）. integral grouting reinforcement.
Integral grouting reinforcement is to adopt grouting penetration and bonding for all component gaps and the bottom slurry of gaps, to glue mosaic particles and particles and bottom slurry into a solid whole.
According to the current classification of grouting materials, one is a cement-based slurry. Cement is characterized by coarse particles and large bleeding pores, which can not penetrate and strengthen fine cracks;
The other kind of grouting material is liquid glue. The solvent is oily diluent with strong permeability. The solute is epoxy-based adhesive with high bonding strength. The original glue of this kind of liquid glue is thin and has strong fluidity and permeability. It can penetrate and bond the pores and tight joints of particles of cement base slurry. It can also be diluted and matched according to the needs of the application, and it can be used in colloid curing After grinding and polishing, the surface is smooth and bright. Generally, it is not easy to be polluted, and a good decorative effect can be obtained.
However, the liquid glue also has some defects, that is, the dilution, curing time, and shrinkage of the glue need to be mastered by trial mixing, and the method of multiple grouting should be adopted during construction. In addition, when purchasing liquid glue and thinner, you should buy transparent liquid glue and match thinner without yellow and yellowing.
（3）. flatness grinding and polishing.
The flatness grinding process shall be added to the marble mosaic floor because the thickness of the mosaic is inconsistent, the particles after paving are uneven, and the glue on the component surface is accumulated due to grouting reinforcement, which is difficult to meet the requirements of flat and bright finish. The polishing process of floor mosaic is complex. There are three differences in the polishing of plates, specifically:
The grinding abrasives and equipment are different. The head course materials and construction equipment selected for mosaic grinding construction shall fully consider the characteristics of granular components, and prevent the particles from hitting the floor (the thickness is only 0.5cm) by the section of abrasive and the speed and weight of the equipment;
The grinding amount is different. The flatness of the marble mosaic is required to reach 90%, and the grinding amount is 0.15 ~ 0.2cm. It is not required to grind excessively low-lying particles to prevent components from being too thin or worn through; The grinding of edges and corners is different. The grinding of mosaic edges and corners not only has a large workload but also needs additional material supplement and grouting. Its workload and process difficulty are higher than that of large-scale construction.
In this improved and added process, the first two processes not only strengthen the whole component but also lay a solid foundation for bearing the third strong grinding process; The third process is to ensure that the finish has a flat and good decorative effect.
（4） Purchase of floor mosaic, bonding materials, and reinforcement materials
1. Purchase of base course bonding materials.
In addition to cement, water-based adhesive with good strength should be prepared as the additional material of interface agent and cement; Or you can directly choose the adhesive containing adhesive to enhance the bonding strength with the component back net.
2. Mosaic shopping.
Considering that the mosaic needs flatness grinding, the components as thick as possible shall be selected; The particles had better not be closely spliced, and it is better to have the same width of the gap.
3. Selection of grouting materials.
The grouting material shall be determined according to the design requirements and the width of the gap between mosaic particles. If the engineering requirements are high and the gap between particles is y-Jl, the solvent type liquid adhesive with good transparency and no yellowing can be selected as the grouting material;
If it is a large gap, you can choose a certain amount of liquid glue and joint sealant with brightness after grinding. In addition, the thinner matched with the liquid glue and the color paste with glue color shall be purchased. If the engineering requirements are low and the gap is standard, the cement adhesive containing glue can be selected.