Analysis used in construction stone

Sand production lines used in the quality of construction stone is very important, and the quality not only comes from production line equipment and sand aggregate all production line, it lies in the quality of raw materials. How to buy natural stone becomes especially important. By forming conditions of rock can be divided into metamorphic, magmatic rocks and sedimentary rock.
Magmatite in construction stone industry in the natural stone used in granite, fai green rocks, basalt, etc.

Granite by quartz, feldspar and small amounts of mica consisting, sometimes also contain a small amount of dark minerals such as Angle flash stone, pyroxene, etc. Granite is full crystal stroma or, a massive tectonic erythema shape structure. According to different particle size, divided into crystallization granule, medium grain, coarse grained, erythema shape etc different species. Apparent density for (25 ~ 27) kg/m 3, dry compressive strength is (90 ~ 160) MPa, bibulous rate is generally less than 1%, anti-freeze label can reach F100 ~ F200 above, resistant to weathering, acid and alkali resistance performance is good, good resistance to wear, very good construction stone, facing the plank.

Fai green rock by feldspar, pyroxene or olivine, etc, to all the crystal mineral composition of grain or the fine particle structure, show massive structure. Apparent density for (25 ~ 3000) kg/m 3, compressive strength is (100 to 200) MPa, bibulous rate is less than 1%, anti-freeze properties is good. Is good facing material.

Basalt by plagioclase, pyroxene and peridot composition, show posterior vitreous crystal quality structure, or covert and often exist porosity and block or almond shape structure. Dense basalt apparent density up (2,900 ~ 33) kg/m 3, compressive strength is different because of structure fluctuates greatly, about (80 ~ 250) MPa, the density of basalt strength and durability are all very good, processing difficulties, mainly for road-building material, the bank in slope protection materials etc.

Sedimentary rock in construction stone industry in common use of natural stone: limestone, sandstone, etc.

Limestone mineral composition mainly calcite, in addition, there are oxidation silicon, dolomite and clay, etc. Generally, a qualitative structure for the crystallization of layered structure. Strength and durability are lower than granite, apparent density for 2000kg/m 3 ~ 2800kg/m 3, compressive strength is (60 ~ 150) MPa, bibulous rate for 0.1% ~ 4.5%. Wide distribution, hardness is small, mining processing easy, are widely used in building engineering and water conservancy project. But unfavorable used to contain free CO2 more or acidic higher water. Mud limestone, calcium clay rock: low strength, water resistance sent, easy weathering, cannot serve as building stone material.

Sandstone cemented by quartz sandstone that becomes cementation. Sometimes in which also have feldspar, mica and other mineral particles. Crusher sandstone is commonly, the granular structure layered structure. Name: according to different object such as oxidation silicon cemented Rachel: qualitative sandstone; Calcium carbonate cementation: gray sandstone; Iron oxide cementation: iron sandstone; Clay cementation: clayey sandstone. The sandstone performance and the content of cement type and close-grained degree relevant. Dense siliceous sandstone: apparent density up (26 ~ 28) kg/m 3, compressive strength can reach (45 ~ 100) MPa, but difficult to processing. Gray sandstone: processing easier, and its intensity can reach (60 ~ 80) MPa, is the most commonly used in sandstone. Iron sandstone behind gray matter, but can still used in sandstone secondary projects. Clayey sandstone in water softening, cannot be used in the hydraulic structures.

Metamorphic rocks in construction stone industry in common use of natural stone: gneiss, marble and quartzite, SLATE, etc.

Common gneiss is granitic gneiss, a by granite metamorphism. Mineral composition and granite similar, crystal particles is grains or a slice of erythema shape, flax, or ribbon structure. Namely light mineral quartz, feldspar and brunet mineral mica, Angle flash in stone, the ribbon is arranged, appearance is very beautiful. Apparent density for (2300 ~ 3000) kg/m 3. Richard direction perpendicular to the piece of the maximum compressive strength, can reach (90 ~ 200) MPa. Richard direction along the tablet easily mining processing, but in frozen into layer under the action of flake easily. High quality granitic gneiss basically the same purpose and the granite.

Marble is by limestone or dolostone metamorphism and become, main mineral composition is still calcite or dolomite. After the metamorphism, crystallization particles directly combined, the tectonic density, system can reach (pressure-blasting machine strength 100 to 200) MPa. Marble hardness is not big, easy machining and polished, appropriate used as building interior decoration. The durability of CO2 and acid is not high, often contact weathering, lose beautiful luster.

Quartzite is becomes by sandstone metamorphism. After the original bad particle and natural quartz sandstone that cemented to recrystallize. Homogeneous structure close-grained, intensity (100 ~ 300) MPa, durability is very high. But the hardness is big, mining processing is difficult, often in irregular massive stone used in building.

Slate is by clay shale metamorphism and into. Or In hard than shale, chopped into easily in the construction stone, thin, good durability, mainly used to cover roofs, and there are green, green, red, black, etc. Various kinds of color, used in roof rather beautiful.