Concrete technology concrete manufacturing presentation

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1. Manufacturing of concrete

2. introduction TO CONCRETE Concrete is one of the most commonly used material. It is a composite material that essentially consists of a binding medium embedded with fine aggregate, coarse aggregate with or without admixtures .

3. STAGES OF MANUFACTURING OF CONCRETE 1 BATCHING 2 TRANSPORTING 4 CURING 3 PLACING 5 7 6 MIXING COMPACTING FINISHING

4. BATCHING 01 Batching is the process of measuring ingredients accurately which are required to produce concrete of proposed volume. There are two prevalent methods of batching materials:- Volume batching Weigh batching. The factors affecting the choice of batching method are the size of job, required production rate, and required standards of batching performance. For most important works weigh batching is recommended.

5. MIXING 02 Mixing of concrete refers to the process of combining all the ingredients needed to make concrete in a uniform and consistent manner. It ensures an adequate mix proportion of concrete. Mixing can be done by adopting one of the following methods :- Hand Mixing Machine Mixing

6. TRANSPORTING 03 Concrete should be transported to the place of deposition at the earliest without the loss of homogeneity obtained at the time of mixing. Also it should be ensured that segregation does not take place during transportation and placement. The methods adopted for transporting concrete are as follows:-   a.       Mortar Pan b.       Wheel Barrow c.        Chutes d.       Dumper e.  Bucket and Ropeway f.   Belt conveyor g.   Pumping

7. PLACING 04 To achieve quality concrete it should be placed with most care securing the homogeneity achieved during mixing and the avoidance of segregation in transporting. Research has shown that a delayed placing of concrete results in a gain in ultimate compressive strength provided the concrete can be adequately compacted.

8. COMPACTING 05 Considerable quantity of air is entrapped in concrete during its production and there is possible partial segregation also. Both of these adversely affect the quality of concrete. Compaction is the process which expels entrapped air from freshly placed concrete and packs the aggregate particles together so as to increase the density of concrete.

9. curing 06 Cement gains strength and hardness because of the chemical action between cement and water. This chemical reaction requires moisture, favourable temperature and time referred to as the curing period. The process of keeping concrete damp for this purpose is known as curing. Methods of Curing:- 1. Water Curing 2.  Steam Curing 3.  Curing by Infra Red Radiation: 4.  Electrical Curing 5.  Chemical Curing:

10. finishing 07 Concrete finishing is considered to be a strong and durable alternative. It is the process of creating a concrete surface of the desired smoothness, texture and durability. The finish differs according to the taste and function of an individual. It can be decorative too. Concrete is basically used because of its high compressive strength. However, the finish of the ultimate product is not that pleasant. In past couple of decades efforts have been made to develop surface finishes to give a better appearance to concrete surfaces and are as follows. 1.     Formwork Finishes 2.     Surface Treatments 3.     Applied Finishes

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