What role do sand and stones play in the process of making concrete?

Concrete is the most widely used civil building material in China. Its main components are aggregate, water and gel, and sandstone is also among them, which plays a role in supporting hardness. These raw materials are mixed with each other and coagulate and harden through chemical and physical-chemical actions, thus producing strength. Concrete has the advantages of good quality and low price, and can maintain strength and appearance integrity for a long time. Concrete will be widely used in marine industry, and different effects will be produced due to different technologies and processes in the production process. Sand and gravel play four main roles in the process of making concrete, including: reducing the shrinkage, skeleton, cohesion and water retention of concrete mixture and reducing the cost.

(1), in the process of making concrete, sand plays a role in reducing shrinkage.

The design of concrete mixture ratio is usually carried out according to the requirements of water-cement ratio method. Cement shrinks continuously in the process of slowly forming, but in order to maintain strength and hardness, sand and gravel will resist this shrinkage, and their hard structure will block the shrinkage process of cement, and finally achieve a more harmonious unity.

(2) In the process of making concrete, sand plays the role of skeleton.

Concrete also has a supporting function like our steel, which needs sand and stone to complete. The skeleton is the most important part, so sand and gravel have a very powerful effect on concrete.

(3) In the process of making concrete, sand and stone play a role in bonding and water retention of concrete mixture.

The density of sand and gravel is relatively high, so it is necessary to calculate the most suitable sand and gravel ratio when making concrete. If the proportion of sand and gravel is not enough, water seepage will easily occur.

What role do you think sand and stones play in making concrete? You are very welcome to comment in the comments section below.