The article examines the organizational and technological aspects of constructing offshore platform substructures and the factors influencing the pace of their erection. A comparison of foreign and Russian practice reveals key constraints related to the continuity of formwork-concrete operations and the applied form-shaping systems. The study presents classifications of materials and technologies, as well as a multicriteria efficiency assessment model that enables the comparison of alternative technological solutions. Based on the findings, the paper identifies promising directions for improving technological approaches to offshore platform construction.

Keywords: offshore platforms, supports, construction, sliding formwork, concreting, technological processes, multi-criteria assessment

The article proposes new compositions of a fast-hardening concrete mixture using Portland cement, fine and coarse aggregates, basalt fiber, a complex modifying additive including acetone-formaldehyde resins and magnesium chloride (bischofite). The results of scientific and experimental studies are presented and the influence of the proposed additives on the formation of the structure, rheological and physico-mechanical properties of fast-hardening concrete is determined. Analysis of the test results showed that the proposed formulations, including a complex additive and basalt fiber, contributed to a decrease in the water-cement ratio, increased mobility of the mixture and increased strength of hardened concrete in the early and final hardening periods.

Keywords: concretes, oil and gas storage, modifying additives, fiber, mobility, setting time, strength