Kryzhanovskyi V. Modified concretes and fiber concretes for rigid highway and airfield pavements construction and repair

The object of the study is concrete and fiber concrete for repair and construction of rigid highway and airfield pavements. Research methods: physical and mechanical characteristics of concrete were determined in accordance with current standards using the equipment of a certified laboratory; experimental studies of concrete were carried out according to the optimal 2-factor plan. Formation and analysis of experimental-statistical models were carried out using a specialized dialogue system. X-ray phase analysis of the structure of concrete and fiber concrete was used. The search for optimal compositions of modified fiber-reinforced concrete was carried out using a set of models obtained. Changes in the physical and mechanical properties and structure of rigid highways pavements concrete on different cement types with using superplasticizer and metakaolin were established. The effectiveness of dispersed reinforcement with steel anchor fiber of concrete for repair and construction of rigid pavements has been revealed. The positive effect of dispersed reinforcement and hardening accelerator on the adhesive strength of road fiber concrete has been confirmed. The possibility of improving the physical and mechanical properties of concrete for rigid highway and airfield pavements with using of dispersed reinforcement, polycarboxylate type superplasticizer and hardening accelerator has been further theoretically developed and experimentally confirmed. The compositions of fast-hardening steel fiber concrete for repair and construction of rigid pavements have been optimized. Regulations on the technology for the preparation and use of fast-hardening steel fiber concrete for full-depth repair of rigid road and airfield pavements were developed and approved in industrial conditions. The results of the research are used at the Odesa State Academy of Civil Engineering and Architecture in the educational process in the preparation of masters of the specialty 192 "Construction and Civil Engineering".