Concrete vibrators

 CONCRETE VIBRATORS:-

 Following are the four types of vibrators:-

1.  Internal Vibrators:- 

• These vibrators consist of a metal rod which is inserted in fresh concrete. 
• Skilled and experienced men should handle internal vibrators. These vibrators are more efficient than other types of vibrators. 

2. Surface Vibrators:- 

• These vibrators are mounted on platform or screeds. 
• They are used to finish concrete surfaces such as bridge floors, road slabs, station platform, etc. 

3. Form Vibrators or shutter vibrators:- 

• These vibrators are attached to the formwork and external centering of walls, columns, etc. The vibrating action is conveyed to concrete through the formwork during transmission of vibrations. Hence they are not generally used. 
• But they are very much helpful for concrete sections which are too thin for the use of internal vibrators.

 4. Vibrating Tables:-

• These vibrators are widely used for making precast products. It is used for prestressing and concrete specimens

 Period of Curing:- The curing period is about 7 to 14 days.