Method and spray aggregate for pouring air-placed concrete

Details Method and spray aggregate for pouring air-placed concrete Method and spray aggregate for pouring air-placed concrete

B - Operations, Transporting

05

D

117/56, 32/63

B05D 1/12 (2006.01) B05B 7/14 (2006.01) B05B 7/26 (2006.01) C04B 14/06 (2006.01) E04G 21/04 (2006.01)

Patent

CA 1302800

ABSTRACT OF THE DISCLOSURE A process for applying a layer of air-placed concrete to a surface in which a pumpable and sprayable air-placed con- crete mix is prepared from cement, aggregates, optionally addi- tives and water. A predetermined volume stream of the air-placed concrete mix is delivered by a concrete delivery pump through a concrete delivery pipe to an air-placing unit comprising means for introducing propelling air under a delivery pressure of sev- eral bar. The propelling air is charged with synthetic silica having a BET surface of at least 25 m3/g. The synthetic silica is introduced with the propelling air into the volume stream of the air-placed concrete mix in such a quantity that, immediately after application, the air-placed concrete applied undergoes a spontaneous increase in temperature of a few degrees Kelvin. An air-placing unit for carrying out the process is also described.

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