In making a good concrete structure, although good vibration may become a decisive factor, at the same time, from the stage of soft concrete mix to very much work process and time are highly involved to the completion of a structure.
- Management of the original quality of material (cement, aggregate, water, and mixture agent) and mixing
- Management of kneads and mixes work.
- Time and quality of the transportation to the site
- Design of structure including thickness of portion that covers outside of steel rod.
- Accuracy of steel rod arrangement and quality
- Finish of mold and strength of timbering
- Selection and quality of exfoliation agent
- Method of injection
- Weather or working environment
- Model selection of vibrator and its usage
- Method and quality of curing
- Times and method of deforming
Although it is rather paradoxical, we introduce how to makethe useless concreteexperienced on the job site, according to the above-mentioned order.
- Since the volume was little, cement that is beginning to solidify was used.
- Use sand that exposes to sunlight and is extremely dried with same amount of water as usual. Moreover, knead and mix them by water includes much salt
- Since the slump of the concrete mix placed in the mixer becomes low during the lunch break, add water.
- Since space to outer wall and/or space in-between reinforcing bars were not enough, vibrator could not be inserted
- Reinforcing bar was deformed and touched to the mold since installation interval of Spacer was bad
- The mold exploded.
- Watering to concrete panel was forgot before placing.
- 8. Since there was no preparation of shot, throw concrete mix down approximately from 2M high.
- Although it became heavy rain, continued working.
- Although three vibrators were prepared, one of them was kept for a spare since there were only two pump vehicles.
- 11. The sheet was stripped in order to dried by sunlight.
Since it was cold, the jet heater was turned on and warmed. (Does not give water)
- 12. Since equipment supplier concerned hurried, the mold was removed next day of the placing.
How is it? However you may use EXEN vibrator, a good concrete structure should not be made. About 100% of quality is guaranteed fortunately from item 1-3 by leady mixed concrete.
However, there are many parts such as the structure design which does not take sufficient space to outer wall or the window down side, etc. the mold assembly which disregarded the flow of soft concrete with. The know-how of us, a specialist of the vibrator, can be used for these parts.
The main point of this chapter is what the precise management covering all process is indispensable for making good concrete.
When it says by our experience, the influence affect intensity and a result is as follows.
Design, material, kneading / mixing and conveyance --20%
Injection and operation (vibrator). -- 50%
Curing and deforming. -- 30%
It is just going to say.
However, the last result will become very pitiable if even somewhere has a defect.