Slate is a kind of rock with plate-like structure and basically no recrystallizationMetamorphic rockThe original rock is argillaceous, silty or neutral tuff, which can be peeled into thin slices along the direction of foliation.The color of slate varies with the impurities it contains.
Slate is a characteristic plate-like structure. The low-grade metamorphic rock consists of claySilty sandSedimentary rock or intermediate acid tuffaceous rockSedimentary tuffSlight menstruationMetamorphismFormation.
Due to dehydration, the hardness of the original rock is enhanced, but the mineral composition is basically not recrystallized, and it has a pleomorphic structure and pleomorphic structure. The appearance is dense cryptocrystalline, and the mineral particles are very fine, which is difficult to identify with the naked eye.There is often a small amount on the board surfaceSericiteAnd other minerals, making the board slightly silky luster.Slate can generally be named in detail according to different color impurities, such as black carbonaceous slate and grayish green calcareous slate.At a lower levelcontact thermal metamorphism It can form light metamorphic rocks with spotted and plate-like structures, commonly called "spotted rocks".Slate can be used as building materials andDecorative materialsIn ancient times, tiles were often used in areas rich in slate.
Component structure and structure
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The low-grade metamorphic rock consists of claySilty sandSedimentary rock or intermediate acidic tuffaceous rock, sedimentary tuffMetamorphismFormation.Black or grayish black.Dense lithology,Plate cleavagedevelopment.There is often a small amount on the board surfaceSericiteAnd other minerals, making the board slightly silky luster.No obviousRecrystallizationPhenomenon.Some unevenly distributedquartzSericiteChloriteIsomineralgrain, but most of them areAphaniticOfclay mineralAnd carbon and iron powders.With variable complementary structure andSpotted structure。[1]
The original rock with plate structure is mainlyArgillaceous rock, argillaceous siltstone andIntermediate acid tuff。Slate isRegional metamorphismLow grade products are obtained. The temperature and isotropic pressure are not high, mainly due tostressEffect.It is mainly argillaceous and siltyMetamorphic rockThe slate with dense structure and developed foliation can be used as building stone, stele, inkstone, etcStone。[2]
Advantages as decoration materials
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slate
Over the years, many facts have proved thatNatural stoneIt has become one of the most popular floor materials.They have some potential characteristics and are very suitable for bathroom floor materials.Slate, as a natural stone, its inherent characteristics make it an ideal bathroom floor material. Its advantages are as follows:
aesthetic value
The popularity of slate in home, including indoor and outdoor, is largely due to its aesthetic value.Its unique surface provides a rich variety of designs and colors, all of which are natural.The difference between bricks makes the bathroom unique.However, different colors and designs will not lead to incompatible patterns.In fact, this will only increase the aesthetic feeling of slate bricks, because they give people a different feeling, which is beyond the reach of other floor bricks, even if they are also natural stone bricks.
Durable
The reason why slate brick is an ideal material for bathrooms has another major advantage, that is, it is very wear-resistant.This is also the reason why many people recommend installing slate flooring in high pedestrian flow areas.In some cases, some owners will complain that there will be "traffic maps" on the slate floor, that is, frequent people walking will cause the slate to wear and form pits.This is not true.It must be pointed out that the reason for this "traffic map" is the curing agent regularly used on slate bricks.To know the care of this special floor tile, the curing agent used must be recorded to know which type is compatible with which.
non-slip
If the selected stone surface is correct, the slate brick can maintain its natural anti-skid performance.Otherwise, it is dangerous when it is wet.However, the skid resistance of slate brick mainly depends on its uneven surface.
Slate bricks are easy to fade if the curing is not sufficient.The seepage of a large amount of water will cause the appearance of slate brick to be old.Therefore, slate should not be installed in wet areas for a long time. In some places, such as the shower area, other materials can be used instead or the correct curing agent can be used regularly for curing.
Of course, slate brick is not perfect and faultless.As time goes by, they will crack.Nevertheless, slate bathroom floor material is still the most popular material in the bathroom floor industry.[3]
Distribution area
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1、 Hebei
1. Hebei Province is a major producer of slate. Baoding, Hebei Province is the main producer of slate, and Yixian County is the hometown of slate and stone. Many of its products are rare in the country, mainly producing rust colored slate and yellow wood grain.Black slate, grey slate, and quartz products have been found.
2. Xushui, Baoding, mainly produces rusty boards, some yellow wood grain, and some purple boards for carving.
3. Tangxian County also produces some plates, but the output is small, mainly purple slate.
4. Xingtai in Hebei mainly produces sandstone and quartz products.
2、 Beijing
1. Beijing Fangshan mainly produces yellow wood grain slate, marine green slate, light green products and black slate, but due to the impact of environmental protection, it is mainly sent to Yixian County for processing.
2. There are also some ore seals in Beijing, many of which have to be shut down.
IIIXingzi County in Jiangxi Province mainly produces black slate and green slate, but the price is relatively expensive.
4、 The place where Hubei Province and Jiangxi Province meet also produces black and green products
VShaanxi produces black slate, but the output is relatively low and the freight is high.
6、 Shanxi produces purple slate, which is mainly used for tile making, with only one factory.
VIIBlack, gray and green slate is also produced in Zhuxi area, Hubei Province.
Main purpose
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roof
Slate stone is mainly used in the construction industry. Slate stone is superior to general artificial covering materials, moisture-proof, wind resistant, and thermal insulation.Slate roofs can last for hundreds of years.MCM slate is safe, ecological and environmentally friendly.
Floor and exterior wall
Slate flooring is used for exterior floors, interior floors and exterior walls.Slate floors are usually laid in outdoor corridors, basements and kitchens.The indoor slate floor is durable, versatile and beautiful.The homeowner can use slate to decorate the interior into a unique environment.The indoor slate floor can be polished slate or natural style and color. The color is very rich, mainly composite gray, such as grayish yellow, grayish red, grayish black, grayish white, etc., reaching 256 collective colors.The outdoor slate floor can be random slate or slate tile.Random slate can be in different shapes, such as solitary, trapezoidalparallelogram。
Landscaping
Slate is often used in various residential and commercial environmental beautification projects due to its weather resistance and pollution resistance.It is often used to lay paths and decorate the surroundings of the swimming pool, including the exterior walls and even the courtyard.Slate stone can also be used as a fountain, combining traditional and modern styles.[4]
Quality identification
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Inspection of flatness
Place a steel ruler with a straightness tolerance of 0.1mm on the two diagonal lines of the inspected surface, and use a feeler gauge orVernier caliperMeasure the gap between the ruler surface and the plate surface.The flatness of the sheet is indicated by the measured value of the maximum gap.The measured value is accurate to 0.1mm.
Angle inspection
Measure with a 90 degree steel angle ruler with an internal angle perpendicularity tolerance of 0.13mm and an internal angle edge length of 500mmx400mm.Place the short side of the angle ruler against the short side of the plate, and the long side of the angle ruler against the long side of the plate. Use a feeler gauge or vernier to measure the maximum gap between the long side of the plate and the long side of the angle ruler.When the long side of the plate is less than or equal to 500 mm, any pair of diagonal angles of the plate can be measured;When the long side of the plate is greater than 500mm, measure the four corners of the plate.
The angular tolerance of the sheet is expressed as a measurement of the maximum gap.The measured value is accurate to 0.1mm.
Inspection of appearance quality
1. For pattern color, place the qualified plate and the inspected plate flat on the ground, and stand at 1.5m away from the plate for visual inspection.
2. Place the plate flat on the ground by manual chiseling, and make visual inspection 1.5m away from the plate.
3. Number of color lines Number of color measurement lines.
4. Use vernier calipers to measure the length, width and height of defects in case of missing corners and broken edges;Visually check the number of missing corners.
5. Use vernier caliper to measure the height of the step, and measure the maximum value as the height of the step.
6. Visual inspection method shall be adopted for visible cracks, and hammering method shall be adopted for hidden cracks (that is, metal hammer shall be used to knock the plate, and the presence of cracks shall be identified by sound, generally mute).
7. Use vernier caliper to measure the size of color spots and visually check the number of color spots.
