Physical properties of Stone
Physical properties of Stone:
All kinds of stone are different, some stone under the action of high temperature, chemical decomposition occurs.
(1) Gypsum: decomposed when greater than 107 ℃.
(2) Limestone, marble: When more than 910 ℃ decomposition.
(3) Granite: In 600 ℃ due to the composition of mineral heat uneven and split
Expansion and contraction
It is also the thermal expansion and contraction, but if heated and then cooled, its contraction can not revert to the original volume, and will retain a part of the permanent expansion; The United States Arsenal had tested from 0 ℃ to 100 ℃, and then reduced to 0 ℃.
Frost resistance To minus 20 o'clock, freezing, pore water expansion than the original volume of 1/10, if the rock can not resist the expansion of the force, there will be destructive phenomenon.
Generally, if the water absorption rate is less than 0.5%, it does not consider its antifreeze performance.
Durability The stone has the good durability, the structure which constructs with the stone has the permanent possibility.
Ancient people have long recognized this, so many important buildings and commemorative structures are used in stone buildings
Compressive strength The compressive strength of stone is different from the factors such as mineral composition, crystalline weight, homogeneity of cemented material, load area, load effect and cleavage angle. If the other conditions are the same, the crystalline particles usually small and bonded together with the dense material, with high strength. Dense volcanic rocks in dry and saturated water after the compressive strength of the difference (very low water absorption rate), if it is porous and afraid of the cement rock, its dry and humid strength, there are significant differences.