2010-04-29
china granite stone wall of non-widely used in Europe, has a long history; North America, high-rise building, the use of limestone, marble sheet rather than a few high also over 200m. In recent years, a number of projects, the architects requested the use of non china granite stone to meet the architectural requirements, such as the Shenzhen Cultural Centre (tuff), Dongguan City Administration Building (yellowish brown sandstone), Bank of China head office in Beijing (yellow and gray marble rock), Guangzhou, Guangdong Development Building (green sandstone), Beijing Financial Street Construction Group (beige sandstone), Mirage Tower (beige travertine) and so on.
As the current specification for the building of such stone walls no relevant regulations, so the works are domestic experts were carried out feasibility studies, proposed the corresponding technical measures.
Second, the material of stone
(1) Stone Type
Non china granite stone, should give priority to using igneous rocks; can be used sandstone, marble; really necessary, they may consider use of limestone; used when loose and porous stone, should be cautiously treated.
In general, silicon dioxide (SiO2) high stone, with high strength and durability, with silicon dioxide (SiO2) 50% or more of the stone, suitable for external walls. On the contrary, calcium oxide (CaO) high stone vulnerable to atmospheric corrosion of sulfur dioxide and other gases, such stone for the walls, the need for better surface treatment, more effective anti-corrosion measures.
(B) the density and uniformity
1. The same type of stone, bulk density has a certain distribution. Usually the volume density of the stone, the material density, high strength and good durability. Volume density ρG than 2.1g/cm3 stone for the low density; ρG = 2.1g/cm3 ~ 2.5g/cm3 to medium density; ρG ≥ 2.5g/cm3 high density. Stone for the walls, the density should meet the requirements of Table 1.
2. For curtain wall of stone, should be more uniform texture.
(1) Stone should not have soft sandwich or weakness of the vein.
(2) the pattern of the rock layer, not a coarse, loose, porous stripes.
(3) pore size of porous rock should not be too large, the holes too deep. 。 Number should not be too many holes. Otherwise, measures should be taken to seal the hole.
(C) the strength of stone
Stone strength as an important target for the dry
Igneous rocks (including china granite) average bending strength test of not less than fm 10N/mm2, when the bending strength of specimens in less than 8 N/mm2, the batch stone walls should not be used; other stone not less than fm 4 N/mm2, when the bending strength of specimens in less than 3 N/mm2, the batch in the wall of stone should not be applied.
Sedimentary rocks are sometimes inconsistent strength in all directions, then along the stone slab under the direction of the intensity of force should comply with these requirements.
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