Winter construction

When the daily average temperature is below 5 ° C, winter construction should be carried out and meet the following requirements:
1. Before grouting, measures should be taken to preheat the foundation surface, keep its temperature above 100 ° C, and remove accumulated water.
Before being frozen, the compressive strength of cement-based grouting materials shall not be less than 5MPa.

What is the general model of early strength grouting material? Donggang high-strength non shrinkage grouting material

Overall, water stains are still the most difficult stone to clean, and our laboratory is further exploring the rules of water stain cleaning. Here we mainly talk about cleaning, and only briefly mention the preventive methods. Some experimentally proven measures that can effectively prevent water stains include: designing moisture-proof measures (blocking+draining) before installation; Reserved water vapor channel; Avoid using inferior cement; Do not blindly use cement additives, etc; Minimize the water content and dosage of cement mortar as much as possible; During installation and maintenance, avoid the stone from getting wet or washed with water to prevent moisture; It is necessary to use stone protectants correctly and reliable protectants.
Construction in high temperature climate environment
If the temperature of the grouting site is greater than 35 ° C, construction should be postponed according to the high temperature climate and meet the following requirements:
Measures should be taken 24 hours before grouting to prevent direct or other thermal radiation from the grouting area.
2. Take appropriate cooling measures, and the temperature of the concrete foundation and equipment base plate in contact with the cement-based grouting material should not exceed 35 ° C.
3. The injection temperature of the slurry should not exceed 30 ° C.
4. Moisturizing and curing measures should be taken promptly after grouting.

What is the general model of early strength grouting material? Donggang high-strength non shrinkage grouting material

As a traditional art, Paper Cuttings has a history of more than 1500 years and is one of the most popular traditional folk art forms. Paper Cuttings art can not only obtain beautiful plane patterns, but also obtain complex three-dimensional structures after specific patterns are "drawn". Recently, the research group of Professor Xie Tao from the School of Chemical Engineering and Biological Engineering of Zhejiang University (the author is Zheng Ning, a doctoral student, and the co corresponding author is Zhao Qian, associate professor) used the Paper Cuttings pattern drawing technology to process the traditional thermosets and obtain a shape memory with complex three-dimensional structure. This technology is expected to be used to construct deformable metamaterials and lightweight high-strength support structures.

The maintenance free construction conditions are as follows

When the construction temperature is above 5 ℃ and below 35 ℃, there is no need for maintenance after foundation grouting. If the temperature exceeds the range, the grouting material construction and maintenance methods should be followed for maintenance.

The usual practice is to mix resin, stone powder, and pigment evenly and adjust them to the color of the stone to be repaired and added. When the color is similar to the stone, add a small amount of drying agent and quickly repair and fill the gap. Make sure the filling is in place so that the adhesive can penetrate in place. When the adhesive is dry, the surface pigment can be scraped off. Finally, lay a fiber mesh on the back of the entire stone mosaic, sprinkle stone powder and resin, evenly smooth it, and bond the mesh with the stone slab to reinforce the mosaic surface. Polish and polish the back of the glued stone mosaic board, then flip it upside down and place it flat on the grinding table. Polish it smoothly without gaps, and finally wax it for polishing. Acceptance criteria for stone mosaic panels: 1. The same color and texture of the same stone in the same mosaic pattern should be consistent, without obvious color differences, spots, or color lines, and there should be no yin or yang colors.