Optimization of formulary and temperature-time parameters of the production technology of reinforced concrete elements of large-sized modules

Introduction. The production of large-sized modules is fraught with technological difficulties, such as the risk of cracking during heat treatment, the heterogeneity of the concrete structure and the need to achieve high early strength for demoulding and transportation.

Aim. Optimization of the formulation parameters of the technology of concreting of the large-sized panels, taking into account the provision of the required characteristics of both heavy and light concrete for up to 5 days from the moment of their manufacture under a given heat and humidity treatment regime.

Materials and methods. Formulation optimization: selection and modification of the concrete composition using modern chemical additives (superplasticizers, hardening accelerators), microsilica and fly ash to improve workability, strength and density of the structure. Concreting of the structures is a key stage of the entire production line, as it is the longest stage, consisting of the sequential execution of certain processes. During the selection of materials, a large number of inert and binding materials, as well as various superplasticizers, were tested. A very significant list of manufacturers and suppliers made it possible to select batches of samples, followed by obtaining test results and identifying the appropriate suppliers.

Results. An optimized formulation of a high-strength and lightweight concrete mix has been developed, providing compressive strength of at least 70 % of the design strength for up to 5 days from the moment of manufacture, reducing the weight of the structure.

Conclusions. Comprehensive optimization of prescription and temperature-time parameters makes it possible to significantly intensify the technological cycle of production of reinforced concrete elements of large-sized modules without compromising their quality and durability. The implementation of the proposed solutions ensures a reduction in energy consumption, a reduction in the duration of the production cycle and an increase in the reliability of finished structures.

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