Natural stone or artificial stone, both have gradually become a widely used category of building stone products in the modern construction industry. Regardless of whether it's a natural or artificial stone product, it is inevitable for weathering to occur during use. Stone weathering typically refers to the erosion of stone due to various factors in the natural environment, causing the stone to crumble. Especially for stones used in outdoor decoration, once weathering occurs, the lifespan is shortened. How can we prevent stone weathering during use? This requires discussing the factors that cause stone weathering.
The Role of Lower Plants:
Under conditions of water and suitable temperatures, spores of moss and molds, among other organic materials, adhere to the surface of the stone and begin to develop and grow, forming various organic color spots on the stone's surface. To survive, these organisms combat substances like nitrogen dioxide in the air, altering the texture and structure of the stone's surface. Furthermore, after these plants die, they combine with water to form organic acids, accelerating the aging of the stone and leading to erosion.
2. Exposure to Ultraviolet Light:
Natural stone has numerous capillary pores, with the smaller the capillaries, the more pronounced the capillary action. Consequently, when the stone absorbs water, under the radiation of sunlight (ultraviolet), the evaporation rate of the water within the stone's capillaries accelerates. This, in turn, speeds up the erosion of the stone by substances present in the water, leading to the aging of the stone.
3. Bonding and Cracking Effects
Adhesives are a common method for stone installation. The residual adhesive on the stone surface, due to aging, causes the bonding minerals to relax, leading to internal stone relaxation and easy peeling on the surface, thereby accelerating the aging of the stone.
4. The Role of Thermal Energy:
Stone expands during the day due to heat and contracts at night due to cold, resulting in thermal expansion and contraction. Since stone contains many different minerals with varying expansion coefficients, it can lead to granular erosion or massive disintegration.
5. The freeze-thaw action of water:
The freeze-thaw action of water can also cause stone weathering: when the temperature drops below 0°C, water freezes into ice, causing a rapid expansion upon freezing after the stone absorbs water, leading to the disintegration and cracking of the stone.
To prevent the weathering of stone, it is necessary to take appropriate measures based on the physical causes that lead to its weathering. Only then can the weathering of stone used in the construction industry be prevented.
