The Structure and Feature of Limestone





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One of the materials you often face in construction or life is limestone. So what is limestone? How are they applied and what types are there? This is not something that everyone can answer. So let's find out with us now.

1. What is limestone?

Before going to learn more about limestone, we need to know what limestone is? Limestone is considered a sedimentary rock. The compositional structure of limestone is mainly calcite mineral, calcium carbonate, symbol CaCO3. This stone is often the most of the essence, but rarely in pure form. Some impurities and limestone are clay, sand, silt, bitumen. The color of the stone is also quite diverse, from white to ash or light green, yellow, even pink and black.

2. Characteristics of limestone

According to scientists, limestone has:

Hardness: 3

Volumetric weight: 2,600-2,800 kg/m3

Compressive strength: 1700-2600 kg/cm2

Water absorption: 0.2-0.5%

Limestone with a high silicon contain will have great hardness but are quite brittle and hard. Compared with ordinary limestone, dolomite limestone has better mechanical properties. Limestone (containing more than 3% clay) has a poor water resistance.

Some places in Vietnam with a lot of limestone are: Tai Meo mountain, Phong Nha cave, Ha Long bay, Karst plain, Karst cave, limestone erosion.

You can replace the formation of limestone through the formation of stalactites in caves.

The chemical formula of limestone occurs in 2 dimensions:

(1) CaCO3 + CO2 + H2O ↔ Ca(HCO3)2 (2)

In the forward direction, chemical reaction from (1) -> (2) shows the process of limestone erosion. In the opposite direction, the method from (2) -> (1) shows the formation of stalactites in caves.

3. What is limestone used for?

Limestone application is also something that many people are interested in today. Although limestone is not as solid as granite, it is more commonly used. This is because limestone is easier to mine and process. People often use limestone to make aggregate for concrete or they can also be used to pave the surface of automobile roads and railway tracks. In some irrigation works they are also used. In addition, people also use limestone to make panels, paving slabs or other architectural structures. In particular, limestone is used a lot in the production of lime and cement.

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