Introduction. Paving roller-compacted concrete is a multi-component, artificially obtained stone-like material that is obtained from a paving roller-compacted concrete mixture, which is characterized by increased requirements for tensile strength at bending, waterproofing, water absorption, abrasion and frost resistance. Applying the technology of arrangement of pavement layers from paving roller-compacted concrete, allows to achieve significant savings in energy consumption when using machines and equipment, to ensure less shrinkage of concrete during curing due to low water-cement ratio. Problem statement. To compare the characteristics and arrangement of traditional cement concrete and paving roller-compacted concrete, to find out whether roller-compacted concrete is an alternative to traditional concrete. Since Ukraine currently lacks, with the exception of certain areas, practical experience in the construction and maintenance of roads with a surface of rolled-compacted concrete, to establish its advantages and disadvantages. Purpose. Perform an analysis of the technology of arrangement of roller-compacted concrete. Compare the physical and mechanical characteristics of roller-compacted concrete and traditional cement concrete. Materials and methods. In the work, the analysis of domestic and foreign sources by topic was carried out, laboratory research was carried out. An experimental study of paving roller-compacted concrete was performed, literary sources of Ukrainian and foreign origins were analyzed. Results. The physical and mechanical characteristics of hardened cement concrete were determined and compared with traditional cement concrete.
Abstract. The article is devoted to quality control of cement-concrete road surfaces at large construction facilities. Purpose of work. Improvement the methods of calculating the characteristic and design values of the cement concrete strength. The object of research is the cement concrete pavement. Research method: experimental scientific-research. The article provides: the quality control process in the construction of cement-concrete pavement and bottom, statistical processing of experimental values compressive and tensile strength, comparative characteristics in normative documents and the main changes between them are performed, also analysis of the European standard is carried out. The values of the tolerance limit t for calculating the characteristics and design values of strength are given, for the number of tests n = 25 with different reliability index for transport structures and distribution laws. The calculation and comparison of the characteristic and calculated design values of the cement concrete strength in accordance with the national standard and the European one is carried out. The results can be used in the calculation of the characteristic and design values of the cement concrete strength during design of concrete mixes.
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