The colder the weather, the more stone problems that followed. Among them, the most common stone problem in winter is the phenomenon of freezing and thawing. This phenomenon mainly occurs near the north or where the weather is cold.
I. Causes of freezing and thawing
The main reason for the freezing and thawing of stone is because of a source – water. When the capillary pores of the stone absorb the corresponding moisture, the water in the stone will begin to freeze once the temperature drops below 0 °C.
In general, substances are subject to the “thermal expansion and contraction” law, and water is just the opposite. The density of water is greatest at 4 ° C, and water molecules operate independently in fluidity. The water is cooled from 4 ° C to 0 ° C. The water molecules in the ice are arranged in a three-dimensional pattern into an unusually loose form. This structure actually leaves a lot of “voids” and the density is reduced. Experiments have shown that when 1 cubic meter of water is formed into ice, its volume will increase to 1.11 cubic meters.
Therefore, when the water enters the pores or gaps of the natural stone, it will freeze and freeze, and the volume will increase, thus expanding the pores or gaps of the natural stone. Then, the natural stone inhales more water. The pores or crevices are further inflated, so that the malignant circulation eventually leads to the fragmentation of the natural stone.
Second, freeze-thaw prevention
Regarding the freezing and thawing phenomenon, no matter what stone protection method, the source is the main form of freezing and thawing Factor – water. We can prevent freezing and thawing by stopping the water from entering the stone. Therefore, for the freezing and thawing phenomenon of stone, it is necessary to adopt the method of pre-treatment, basically to protect the stone with stone curing agent.
After drying the stone, apply a protective agent such as a waterproofing agent repeatedly and evenly on the surface of the stone. The purpose is to prevent freezing and thawing in order to prevent moisture from entering the pores of the stone.
The reason why stone protection work is important is to make the stone healthier, reduce or even eliminate the occurrence of stone lesions. Environmental factors are inevitable, but we can artificially protect the stone. Stone freezing and thawing is only one of the stone problems, but stone protection can avoid many stone problems.
(provided by Shenyang Building Materials Network) <
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