Red sandstone is also known as redstone in some places, mainly in the southern provinces. Basic characteristics of sandstones Rocks of sedimentary rocks such as mudstone, sandy mudstone, argillaceous sandstone, sandstone and shale, which are widely found in the southern provinces, are rich in red, dark red or brown oxides. Red sandstone. The red sandstone is mainly composed of two kinds of typical structures: granular crumb structure and mud-like cement structure. The strength changes greatly due to the difference of cementing material and weathering degree. After excavation or blasting, most red sandstones can be disintegrated and even muddy by the action of the atmospheric environment. Therefore, the size and particle gradation of the rock mass will change with the time course of the dry and wet cycle, and its physical and mechanical properties are also Will produce changes.
1. Red sandstone classification Red sandstone is divided into the following three types according to strength and disintegration characteristics: (1) One type of red sandstone, the natural uniaxial compressive strength of the rock mass is less than 15Mpa, and the water is immersed for 24 hours after drying at 105 °C. Within the slag-like, muddy or granular disintegration; (2) the second type of red sandstone, the natural uniaxial compressive strength of the rock mass is less than 15Mpa or slightly larger than 15Mpa, and it is immersed in water for 24 hours after drying at 105 °C. Block disintegration; (3) Three types of red sandstone, the natural uniaxial compressive strength of the rock block is greater than 15Mpa, and the non-disintegrating characteristics are indistinguishable from ordinary sandstone.
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