With the development of stone maintenance engineering practice, the maintenance technology is greatly enriched. Maintenance theories also emerge one after another. Various theories are based on the analysis and answers to various problems and phenomena in maintenance practice, which have their rationality and applicability, one-sidedness, and restriction. Through investigation, it is found that some new problems have emerged in the recent stone maintenance practice and some new viewpoints have been formed. This article will share with you:
1. Stone protection shall be carried out according to material conditions
In engineering practice, it will be found that the protective effect of the protective agent on some kinds of stone is poor. In such a case, in addition to the protection failure caused by improper installation, the greatest possibility is that the stone protective agent is not used. For example, granite and marble have different formulations of protective agents because of their different mineral and chemical composition. Even the same kind of stone will increase or decrease the concentration of silicone resin due to different densities and chemical compositions. For example, the concentration of silicone resin in sandstone protective agents will be higher, and the concentration of silicone resin in granite or marble protective agent with high hardness and density will be lower. Therefore, in the stone maintenance construction, we must adjust measures to the material conditions and construct according to the material. Different chemicals and construction processes are selected for different stones.
2. Not all natural stones need protection
If it is only waterproof and alkali proof, some high hardness and high-density stones can not be protected in dry hanging construction. This situation also applies to some coarse-grained granite. For example, for the coarse-grained magmatic rock obtained by slow cooling in igneous rock, there are many large pieces of quartz. This very dense quartz surface cannot be penetrated by water and other pollutants.
What stones need protection and what stones don’t? The test method is to drip water under the marble polishing surface or drip vinegar on the granite polishing surface. If there is no water spot or vinegar spot residue after 5 minutes, this kind of marble or granite may not be protected.
3. Natural stone floor pavement does not need to use smooth stone. After rough surface leveling and renovation, manual maintenance can be carried out
The current floor pavement is to select smooth stone for direct pavement, and then level and renovate, which is equivalent to repeating the polishing process and high cost. The correct way is to choose the effect of smooth stone, buy rough surface specification board, and then pave, level, renovate and maintain, which can greatly reduce the cost.
Although there are many advantages, this method is generally only suitable for granite stones with a small color difference and no texture. For many marbles with texture, because there is a problem of typesetting, we should use the traditional method to arrange the patterns before construction.
Interior decoration stone is not affected by sunlight, wind, acid rain, fog, snow, and frost. Therefore, the duration of the protective effect will be longer than that of the outside. From the perspective of reducing indoor decoration pollution and reducing cost, cheap water-based protective agents can be selected. However, it is recommended to use solvent-based protective agents in kitchens, bathrooms, and other highly destructive environments
4. Rust spots and yellow spitting shall be distinguished, and rust remover shall not be used for treatment
Many times, we mistook the yellow spots on the stone surface for rust spots. Rust spots contain iron, which can generally be removed with rust remover. There are generally two causes of the macula, which is easy to be confused with rust spots. One is that when the stone is wet pasted and filled, the organic additives in the cement penetrate the surface through the pores on the bottom. Under the condition of water and oxygen, the double bonds of organic components break and the color turn yellow. This situation is common in the wet paste and filling of white hemp stones.
There is also a situation in the cream yellow marble, because the alkali spot to the surface absorption of crystalline water to produce gel layer, changing the refraction of light, makes the alkali spot color darker as if it is “more yellow”. The gel layer containing crystal water is acting strange. Therefore, the macula of these causes can not be simply solved by using rust remover. The remedy should be tailored to the case, otherwise, it is likely to get worse and worse.
5. Do not blindly believe in imported stone maintenance products, and do not be biased against domestic maintenance products
At present, the maintenance products of foreign brands are generally regarded as a symbol of high quality. But its high price affects the promotion of foreign brands. Domestic brand maintenance products are generally not optimistic, but they also occupy a certain market share because of their cheap price. In fact, these prejudices stem from the ignorance of stone conservation knowledge. All protective agents, whether imported or domestic, are composed of active ingredients plus diluents and additives. There is no difference between imported and domestic.
In recent years, the R & D and application of stone protective agent products in China have developed rapidly. It has been close to foreign advanced technology in the field of silicone monomer manufacturing and resin synthesis. In terms of the compounding process, it is equivalent to that abroad. In the field of construction application, it is ahead of foreign countries.
The correct view is that stone protective agents should not take “imported or produced at the same time, high or low price” as the standard to judge the quality. It should depend on whether appropriate products are selected for appropriate engineering practice. Some protective agents are selected for some projects, which have good effects. They may happen to be domestic brands and cheap, which shows that they are selected correctly. Some projects choose some protective products with poor effects and high prices, which may happen to be foreign brands. This can only indicate that the selection of protective products is appropriate or inappropriate.
Well, this article will be written here first. There will be more relevant articles in the future. Please look forward to it!
