Blending amount

Generally 5-10% a cantităţii de materiale cimentoase.

The mixing method of silica fume is divided into internal mixing şi external mixing.

1. Amestecare internă: under the premise of the same amount of water, 1 o parte din fumul de silice poate înlocui 3-5 părți de ciment (greutate) și menține rezistența la compresiune a betonului neschimbată, îmbunătățind în același timp alte proprietăți ale betonului.
2. External mixing: the amount of cement remains unchanged, and the addition of silica fume significantly improves the strength of concrete and other properties. Betonul amestecat cu fum de silice atunci când există o anumită pierdere în cădere. Acest punct trebuie notat în testul raportului.

Silica fume must be used in conjunction with water reducing agents, it is recommended to compound fly ash and finely ground slag to improve its constructability.

When formulating concrete with silica fume, the general weight ratio with cementitious materials is:

• Beton de înaltă performanță: 5-10%.
• hydraulic concrete: 5-10%
• beton împușcat: 5-10%.
• Pumping aid: 2-3%.
• wear-resistant industrial flooring: 6-8%.
• Mortar polimeric, mortar de izolare: 10-15%.
• Indefinite refractory castables: 6-8%. Before use, please select the reasonable and economic mixing amount through experiment according to the actual needs.

Mixing method.

Beton cu fum de siliciu and castables should be made by the test room. Strictly follow the construction ratio. Silica fume should be added to the mixer immediately after the aggregates are fed. There are two procedures for adding.

1. Into the aggregate, urmat de fum de silice, amestec uscat de ciment, and then add water and other admixtures.
2. Puneți în agregat grosier + 75% apă + Fum de silice + 50% agregat fin, mix for 15-30 secunde, apoi se pune în ciment + amestec + 50% agregat fin + 25% apă, mix until uniform. Timpul de amestecare este 20-25% sau 50-60 secunde mai lung decât betonul obișnuit. Never add silica powder into the already mixed concrete.

Construction method

There is no significant difference between the construction method of silica fume concrete and ordinary concrete, but it is necessary to organize and vibrate densely during construction well. The early strength of silica fume concrete will make the final setting time earlier, which should be paid attention to when plastering; în același timp, the addition of silica fume will improve the viscosity of concrete and significantly reduce water secretion, making plastering slightly difficult.

Construction safety

Silica fume concrete construction safety should be strictly in accordance with the relevant national construction specifications for concrete projects, but because silica fume is light, it is strictly prohibited to throw the material from a height to prevent silica fume from flying.