How To Mix Concrete At Site || Concrete Mixer Machine || 

Importance of Mixing of Concrete
Proper mixing of concrete ingredients is of utmost importance in order to produce good quality of fresh concrete. During the process of mixing the surface of all the aggregate particles is coated with cement paste. Well mixed concrete is required for the desired workability and performance of concrete in both the fresh as well as the hardened state. If the concrete is not well mixed, then it tends to segregation and bleeding
Characteristics of Well Mixed Concrete
Concrete should be of uniform colour.
All concrete materials like cement, fine aggregates, coarse aggregates and water should be homogeneously mixed.
Cement paste should cover all the surface of the aggregate.
Segregation or bleeding of concrete should not occur after the concrete mixing.
When it comes to mixing concrete, following three mixing methods are used for the production of effective and good quality concrete.
01. Hand Mixing of Concrete (Mixing concrete manually without a mixer machine)
02. Machine Mixing of Concrete (Mixing concrete with a mixer machine)
03. Ready Mix Concrete (Mixing in automatic or semi-automatic batching plant)
Different constructions require different type of concrete mixing. For the efficient result, using appropriate method of mixing of concrete for the specific use and application is essential. Several factors affect the method of concrete mixing such as,
Location of the construction site with sufficient land for construction activities e.g. highly congested urban areas
Available space for concrete batching and mixing and storage of aggregates
Volume of concrete needed
The construction schedule like the volume of concrete required per hour or per day
Height at which concrete is to be placed
Cost
The Process of Machine Mixing of Concrete:
First of all, wet the inner surfaces of the drum of concrete mixer.
Coarse aggregates are placed in the mixer first followed by sand and then cement.
Mix the materials in the dry state in the mixing machine. Normally it should be 1.5 to 3 minutes.
After proper mixing of dry materials, gradually add the correct quantity of water while the machine is in motion. Do not add more water than required. It is not advisable as it reduces strength.
After adding the water, you must mix concrete for a minimum of two minutes in the drum.
If there is any segregation of concrete after unloading from the mixer, then remix the concrete.
Precautions to be Taken While Machine Mixing of Concrete:
Concrete mixer machine must be wet before use.
Take care of mixing time, speed and numbers of revolution of mixer drum as per the recommendation of the manufacturers of the mixer machine.
Concrete should be used within 30 minutes after mixing and discharged by the concrete mixer.
If your mixing is batch type then, after discharging one batch of concrete, the interior surface of the mixer drum should be cleaned thoroughly. If not, lumps of hardened concrete from the mix of previous batch may form a part of the subsequent batch and deteriorate the quality of concrete.
If your mixing is of a continuous type, it is necessary to clean the concrete mixer after fixed intervals.
The inner portion of the concrete mixer should be carefully inspected at regular intervals to check for damages, shatter or corrosion.
How To Mix Concrete At Site || Concrete Mixer Machine ||
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