How the weathered stone

Physical weathering of stone on stone because it is iterative in nature to carry out, there are known mechanical weathering of stone. Stone before and after use in the mining, due to the natural environment, hot and cold, rain, snow, fog, frost, radiation, earthquakes, alternately, between the grain structure of the rock fracture, displacement, pull, wrinkles and other morphological changes, and Local changes gradually from the surface to the inside, from small to big, from the edge to the center, from coarse to fine, and finally to become a loose stone, broken state, with the continued expansion of these state stone information, the stone's physical properties, such as density, strength, water absorption and other changes, the use of functional decline. Physical weathering of stone for the further chemical weathering of the stone foundation, but also completely chemical weathering of stone to create the preconditions, the main types of physical weathering of stone below.
(1) freeze-thaw weathering
In cold areas, the large diurnal temperature changes, both within and outside the water stone conservation in the stone holes, cracks, decorative sewing, installation, alternating between sewing freeze - thaw - re-freeze - and then melted, the water and ice expansion and contraction force repeatedly, eventually causing the stone structure of the surface and near surface loosening and fracture, so that the stone fragmentation. Freeze-thaw weathering of stone larger pores in the stone, water absorption greater density of relatively small species is relatively obvious. Understanding of freeze-thaw weathering properties of these stones is conducive to avoid it in the defects in the design, select resistant varieties of freezing and thawing of the stone.
(2) thermal weathering
In addition to the exploitation of thermal energy when weathering this phenomenon, if the flame cutting, powder division. When decoration is also in there, such as stone decoration in the heat pipe, kitchen desk, etc., repeated movements due to temperature (frozen not in this case), some components in the faded stone, rough, variable crisp, leading to stone weathering.
(3) of dry wind
It is similar to another of weathering heat, but dry and cold temperatures well below the temperature of thermal energy.
(4) biological weathering
It is the nature of plant root growth in the holes in the stone, fracture, due to the growth of plant roots hold the stone expansion, extrusion, to stone damage.
(5) wind weathered
Mainly in the strong wind-driven sand by the wind impact on the stone caused by decreased surface gloss of stone, rough, such as micro-structure of particle shedding. Building and decorative stone in contact with the ground part of this phenomenon is particularly evident. Therefore, vulnerable to strong winds, sand, wear a big impact at the installation of rough stone, such as the fire board, mushroom stone, sand board, antique stone, is a realistic and sensible.