What are the raw materials of concrete? thank you

Generally speaking, the term concrete refers to cement as cementing material and sandstone as aggregate; Cement concrete, also known as ordinary concrete, is made by mixing and stirring water (including admixture and admixture) in a certain proportion, which is widely used in civil engineering.

Concrete has the characteristics of abundant raw materials, low price and simple production technology, so its consumption is increasing day by day. At the same time, concrete also has the characteristics of high compressive strength, good durability and wide range of strength grades.

These characteristics make it widely used, not only in various civil engineering, but also in shipbuilding, machinery industry, marine development, geothermal engineering and so on. Concrete is also an important material.

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The most important mechanical properties of concrete after hardening refer to the ability of concrete to resist pressure (such as compression, tension, bending and shearing). Water-cement ratio, variety and dosage of cement, variety and dosage of aggregate, and mixing, molding and curing all directly affect the strength of concrete.

The strength grade of concrete is based on the standard compressive strength (cube with side length of 150mm is taken as the standard specimen, which is cured for 28 days under standard curing conditions, and measured by standard test method, with a guarantee rate of 95%).

Known as labels, they are divided into C 10, C 15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80, C85, C90, C95 and C655.

The tensile strength of concrete is only110 ~1/20 of its compressive strength. Improving the tension-compression ratio of concrete is an important aspect of concrete modification.