Laying stone with concrete in the interior zone of the Ust-Ilim dam

Abstract

1. When 8–13% of oversize stones are laid in a concrete block, the difference between the temperatures of the concrete mix and the stone being 4–6°C, the maximum temperatures for exothermal heating of the concrete fall by 2–6°C. 2. Laying of stones at −14°C in concrete mix at 6–7°C does not lead to freezing of the concrete mix at the stone-mix contact provided that the concreting is performed under a heated canvas shelter. 3. When 8–13% of stone is laid in the block and when the temperature difference between the concrete mix and the stone is 4–21°C, during the stage of exothermic heating the concrete around the stone is compressed. There is a tendency for the compressive deformations to decrease as the stone content of the concrete increases. 4. During cooling of stone-concrete blocks, the stress state of the concrete surrounding a stone is mainly governed by the overall thermal stress state of the blocks. 5. Field investigations of the temperatures and thermal stress states of stone-concrete masonry show that it is possible and advantageous to lay oversize stones (even if their temperatures are 15–20°C below the temperature of the concrete mix) in the interior concrete of a dam.