| Popis: |
The machine described has been designed for accelerated weathering of concrete surfaces. Its basis is a turntable on a vertical axis, carrying concrete exposure specimens which are subjected to the action of smoke, water sprays, cooling elements and heating elements. The machine accommodates 32 specimen slabs of concrete each measuring 2 ft. × 1 ft. × 2 in., and by an automatic arrangement each of these is subjected to a complete `weathering cycle' once in 48 hr. This weathering cycle comprises four consecutive 3 hr. exposures to the action of smoke, water sprays, cooling elements and heating elements respectively, followed by a rest period of 36 hr., and this arrangement of weathering and resting may be repeated automatically for any required period of time. |
