Introduction. The introduction to the paper highlights the advantages of usage and also the relevance of works on standardization for two on the hydraulic binder based materials namely roller-compacted concrete (RCC) and hydraulically bound mixtures (HBM).
Problem statement. The issue of the paper covers the comparison of RCC and HBM the technology of application of which during constructing of motor roads and objects of the transport logistic envisages the laying by the asphalt pavers and the compaction by the roller thus providing economic effect in comparison with the usage of conventional concretes.
Purpose. The goal of the paper is to perform the comparative analysis for RCC and HBM in particular for in the worldwide practice implemented standard methods for testing these materials to emphasize the major differences between RCC and HBM as the objects of standardization and for drafting main propositions regarding the direction of following works to provide wider implementation of RCC and HBM for construction of objects of transport infrastructure and logistic.
Results. The principles for standardization of RCC and HBM including meaningful differences in their compositions and specifications relating those materials’ project age were analyzed. It was stated that the assignment of RCC to standard concretes assures the resolution of QC tasks with ensuring a design class of material and also provides the abilities to use the specimens scale factors for standard procedures of strength determination and to perform the recalculation of values of strength measured by different methods.
The differentiation between standard methods for mixtures testing was performed and principled differences between compositions were emphasized according to which RCC should be classified by consistency as it was accepted for conventional concretes whereas HBMs in their plastic condition are characterized in general by values accepted for soils.
Also, the comparative analysis for standard methods of specimens manufacturing for RCC and HBM was performed and the main problems of implementations of that materials within the frame of the national Ukrainian standards system was stated.
Conclusions. The difference between compositions of RCC and HBM determines the implementation of different standard methods for testing RCC and HBMs in their plastic condition as methods accepted for two different road materials: concrete mixtures and soils.
Considering high stiffness of RCC-mixtures developing no slump, the test method for consistency measurement for RCC-mixtures was standardized separately from relevant test methods for conventional concretes compacted by the internal vibration.
The standard methods for testing of RCC-mixtures are representative in terms of corresponding technologies of road construction industry; along with this the usage of standard compaction methods with the optimum moisture content measurements for RCC by the analogy with HBM is effective during the construction of structures from mass concrete such as dams and others.
The implementation of methods for testing for RCC-mixtures and also methods for RCC specimens manufacturing as identical to international standards ones in the system of national Ukrainian standards has no alternative. The standardization of RCC will require carrying out the work to verify/confirm the assurance of standard values of the coefficient of variation of compressive strength.
