Features and technology for the manufacture of reinforced silicate concrete tubing
From the experimental data, it follows that the strength of the strength when compressing samples from a rough binder was in the range of 400-600 kg/cm2, and their frost resistance was 45-100 cycles. Some samples after 100 freezing and thawing cycles did not have signs of destruction. For samples of highly dispersing astringent, compression strength was in the range of 600-840 kg/cm2, and the tests for frost resistance gave the same results as the samples from the first series of plates.
As shown by factory experiments on forming plates on the press of Melia, the depth of filling the mass into the nests of the forms should be in the range of 130-135 mm. At a backfill deposit deposits of 140 mm, the rotating table did not always turn, and during the backfill of less than 130 mm, the cheesecake was undergoing. Thus, factory experiments on the production of facing plates confirmed the full possibility of using the Press Melia for semi-dry pressing of facing slabs from lime-creamy knitting, with high strength and durability. The high properties of silicate concrete allowed us back in 1956-1957. raise the question of the use of this new material in the manufacture of reinforced tubing for driving tunnels of the Leningrad Metro. Currently, Portland cement of the Leningrad Plant is used to make tubing from concrete 600 (activity 450-500 kg/cm2): reinforced concrete ribbed tubing are made of hard concrete mixtures of Portland cement consumption 450-500 kg/m3 of concrete. Sand and granite crushed stone up to 30 mm are used as aggregates.