For the stone curtain wall building, why there are spots, water stains, yellow rust, etc., Shi Xueli, executive deputy director of the Stone Construction Committee of the Beijing Construction Engineering Materials Association, pointed out in an interview that the stone used for building exterior wall decoration is basically There are many reasons for the pollution caused by dry hanging technology. First of all, whether it is granite or marble, there are some tiny pores as stone. The internal chemical composition varies depending on the type of material. When during construction or after installation, if there is corrosion caused by non-standard dry hanging parts, or acidic substances such as rain and snow in the natural environment and corrosive gases such as sulfur dioxide in the air, the pollutants will pass through the surface of the stone.å‘L causes corrosion and pollution.
Mao Yunzhang, secretary-general of the Stone Professional Committee of the Beijing Construction Engineering Materials Association, added: Stones such as granite seem to be very hard, but in a sense, they are also very fragile. For example, in mining, in the past, iron plate sanding technology was used to cut stone. The fine iron powder that appeared during processing would cause pollution to the stone if it was not washed out in time. There is also a transportation link is also very important. If it is the wagon for transporting coal, it will not be thoroughly cleaned after loading and unloading, and the stone will continue to be loaded. This transportation process will definitely cause pollution to the stone.
Prevention is the main governance
Wang Yanhua, an expert in China's stone application nursing expert group, said in an interview: At present, the pollution problem of decorative stone in China is still quite serious.
When talking about how to control stone pollution, Wang Yanhua put forward the theory that prevention is the mainstay. He believes that the treatment of stone pollution is first of all from the prevention of manpower, through the method of painting stone protection (conservation) agent, to prevent the phenomenon of stone disease. Stone protectant is like giving people a vaccination. The stone surface is brushed with a curing agent, which is equivalent to wearing a layer of invisible clothes to prevent the invasion of pollution sources. There are many types of curing agents, and different curing agents should be selected for different stone varieties and parts.
For example, Wang Yanhua said: curtain wall stone is dry hanging technology. The natural factors of pollution caused by stone are greater than human factors. Dust and rain are the main causes of water spot rust on stone. Therefore, when choosing a protective agent, you should choose a product with waterproof function.
If the investment unit was able to recognize this when the building was originally decorated, a modest increase in the amount of maintenance investment would result in a multiplier effect. There is a five-fold difference compared to the cost of secondary investment in pollution control in the future.
Wang Yanhua pointed out: It is not enough to have the right choice, but also to operate correctly. When it comes to how to operate correctly, Wang Yanhua sums it up into four elements. The first is the degree of dryness of the stone; the second is the amount of curing agent; the third is the curing cycle; the fourth is to roll, brush, spray, and wipe must be uniform. Wang Yanhua believes that as long as these four points are achieved, the stone curtain wall building can basically eliminate the phenomenon of “pan-flowering†on the surface of the stone when it rains.
Stone protection industry needs to be standardized
According to Wang Yanhua: Since the production of solidified materials for stone protectants is not high, precise and sharp, the formulas of various additives and stabilizers are easy to engage, so although stone protection is still an emerging industry, there are already many Units and individuals are engaged in this industry, so there is inevitably a phenomenon of uneven products and a lack of order in the market.
Wang Yanhua said: There are many reasons for the confusion of the stone protective agent market. First of all, the owner's investors do not pay much attention to the stone protection. They believe that the product grades can be high or low, and invisible for some unresponsible practitioners. machine". Secondly, some people who are interested in smoldering are shoddy. There is also the stone protection industry has not received timely support from relevant departments. Relevant such as “construction quota standard†and “construction professional qualification level standard†are still urgently needed to be established.
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