Ready mix concrete M20 is a standardized mixture of cement, aggregates, water, and additives, prepared off-site in a batching plant according to specific proportions and delivered to construction sites in a ready-to-use form. The "M20" designation refers to the compressive strength of the concrete after 28 days of curing, which is 20 megapascals (MPa).

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Here's a breakdown of its components:

1. Cement: Typically Portland cement, which acts as the binding agent when mixed with water. The amount of cement used in M20 mix is determined by the desired strength and workability of the concrete.

2. Aggregates: Consist of coarse and fine materials such as gravel, sand, or crushed stone. Aggregates provide bulk to the concrete mix and contribute to its strength and durability. The proportions of coarse and fine aggregates are carefully adjusted to achieve the desired properties of the concrete.

3. Water: Required for the hydration of cement, forming the paste that binds the aggregates together. The water-cement ratio is crucial for achieving the desired strength and workability of the concrete. It's carefully controlled to prevent issues like cracking, shrinkage, or excessive porosity.

4. Additives: These may include chemical admixtures like plasticizers, accelerators, retarders, or air-entraining agents. Additives are used to modify the properties of the concrete, such as improving workability, reducing water requirements, enhancing durability, or controlling setting time.

The M20 grade of ready mix concrete is commonly used for various structural applications in residential, commercial, and industrial construction projects where moderate strength is required. Its versatility, consistent quality, and convenience make it a popular choice for a wide range of construction applications.