In addition to the dirt in the rock mass, the lower plants growing on the rock are also removed to isolate the organic acids produced during their growth.
Erode rocks.
2. Desizing: apply slurry three times to remove the soluble salt in the stone carving, so as to avoid the repeated reaction of the soluble salt with the change of temperature and humidity in humid air, resulting in crystal precipitation on the surface, volume expansion and loss of the rock surface.
3. Anhydrous flushing: flush the rock mass with anhydrous alcohol, so as to permeate capillaries, dredge holes and prepare for infiltration and reinforcement;
4. Infiltration reinforcement: SAE-300 elastic reinforcing agent infiltrates the rock. Polymerized SAE-300 is slowly hydrolyzed in solution. During the reaction, the mineral particles of the rock are bound together through silicic acid film, which has no side effects and does not affect the physical essential characteristics of the rock, such as water absorption. There is no isolation layer on the rock surface, but a uniform strength profile is formed. The reaction is as follows:
Si (or)+4h2o (catalyst +H2O) → SiO2 AQ+Roh+H2O.
5. Hydrophobic treatment: coating hydrophobic agent, isolating water medium and cutting off pollution sources.
6. The softening test of aging epoxy resin residue was carried out in the laboratory.
After the experiment, more than two months of uninterrupted observation records show that the appearance of the experimental rock surface has not changed significantly; The hydrophobic effect is remarkable; The reinforcement experiment shows that the average compressive strength of rock samples in 10 group without reinforcement measures is 48.8, and that after reinforcement with SAE-300 reagent is 53.4. The performance of various experiments fully shows that the coating method of this material can minimize the weathering speed of rock surface and weaken the erosion of wind, rain and dust. At the same time, the strengthening measures of SAE and the hydrophobic measures of hydrophobic agent are reversible and will not affect the effectiveness of other protective measures in the future.
This safe reinforcement and hydrophobic protection method has been applied in China in recent years, such as the masonry reinforcement at the top of Xi 'an Dayan Pagoda, the local reinforcement of Banpo site in Shaanxi, and the seepage control project of Ganling limestone reinforcement in Shaanxi. From the effect analysis, the expected protection goal has been basically achieved. However, there is no precedent for the protection of rock paintings in the northern alpine region. The simulation protection experiment of Acheng Yagou stone carving provides a practical basis for the protection of rocks and immovable stone carvings in the northern alpine region.