Prescription and Technological Aspects of Manufacturing High-Quality Centrifuged Products and Structures from Heavy Concrete

Abstract

The previous studies of centrifuged reinforced concrete structures, aimed at the supports of contact lighting networks, poles of power transmission lines, columns of single-stage buildings and overpasses, piles-shells were studied. A number of experimental studies were carried out in the Technology of binders, concretes and construction ceramics laboratory of Don State Technical University Academy of Construction and Architecture. An experimental laboratory unit-centrifuge TsSRL-1 with a DC motor with thyristor power units was developed and applied. It was noted that number of rotations is the most essential parameter to regulate the average density and, correspondingly, the wall thickness of the centrifuged product. It is confirmed that the final sealing of the walls by centrifugation happens when the maximum compressive pressure is applied on the walls complied with the rotation speed of the mold at the sealing number of the shape revolutions. The main parameters of centrifugation during this period are the sealing speed of the shape and the duration of centrifugation. The result of the experiments allowed finding the optimal ratio between sand and granite crushed stone, which ensures a minimum cement consumption for centrifuged concrete B40 and a minimum yield of cement to the slurry.