Strength of cement concretes compacted by pressing or rolling

Abstract In the last two decades, researchers have paid special attention to the compaction of concrete by pressing in the technology of cement concretes for road and civil construction. A variation of this method for road cement concretes is their compaction using rollers. Such concretes are called roller-compacted concretes (RCC). In concretes compacted by pressing, water consumption is reduced, which allows for a corresponding reduction the consumption of binder. The rate of strength gain of such concretes is higher than in the concretes compacted by vibration. In pressed and rolled concretes, it is possible to use various production wastes, including dust from crushing stone materials or the destruction of construction sites. This makes such concretes attractive for the technology of creating “green concretes”. However, as practice shows, these concretes have not received wide application, including in Ukraine. Their application is limited to the manufacture of small-sized products such as wall blocks or paving slabs. This is due to the lack of consensus among scientists and practitioners on the impact of cement consumption, dust amount, pressing time and other factors on the main indicator of cement concrete - strength. Therefore, this article examines the impact of various factors on the strength of concretes that are compacted by pressing or rolling.