Introduction to red sandstone

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.

Mainly used in construction. Nowadays, it not only has certain applications in architecture, but also plays a decisive role in decoration. It has a moisture-proof function and a function of absorbing noise, which is the first choice for today's new decorative materials.

GT Series PCR Machine adopts 6 standard Marlow semiconductor chiller, and the number of cycles is more than 200 thousand times. This series of products is stable in performance, simple in operation, practical and economical.

Characteristic:

1. The most advanced peltier-based semiconductor technology
2. High performance global general-purpose power supply
3. 5.7 inch high clarity and super large liquid crystal display
4. Chinese and English bilingualism graphic interface
5. Power cut data protection function
6. Metal shell, solid, practical, beautiful and generous
7. Stepless adjustable hot cover can be used to test tubes at different heights.
8. Location of heat cover at any angle
9. The high seal reaction zone ensures the stability and reliability of the experiment

Cassification: Ordinary type, Gradient type.

GT Series PCR Machine

GT Series PCR Machine,PCR Thermal Cycler,Gradient Thermal Cycler PCR,PCR Thermal Cycler Machine

Zhengzhou mingyi instrument equipment co.,ltd , http://www.mingyint.com