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For cast-in-place SFRC when is internal vibration used and when is form vibration used?

For cast-in-place SFRC when is internal vibration used and when is form vibration used?
Update Time:2018-01-23
For cast insitu, internal vibration is the most used option to consolidate the concrete. Form vibration is generally used in the precast industry.

When steel fiber concrete is cast into form work a small amount of vibration of the forms helps keep the fibers from touching the forms and thereby from being visible when the forms are removed. For example, during casting of steel fiber reinforced precast structures, the forms are vibrated to consolidate the concrete. this action results in an almost fiber free surface of the structures. So allowing a short period of form vibration in the all cast-in-place structures, in addition to internal vibration where possible, will provide the best finished surface.
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Dalian Harvest Metal Fibers Co., Ltd. is a Sino-France joint venture company , a specialty in producing thermal resistant steel fibers, and steel fibers for concrete reinforcement. HARVEST steel fibers have been well adopted by a wide range of professionals, such as Metallurgy, Cement, Petrol refinery, Chemistry, Ceramics, and so on. Steel fibers have been well used in concrete construction projects, such as  bridges, tannels, high ways, airport,  power stations, industrial floors. More than 90% of HARVEST steel fibers have been used by our customers in Asia, Europe, North and South America,  Australia, etc… . HARVEST has been winning the users high praise because of high quality products and good services.