OPTIMIZATION OF ACCELERATED CARBONIZATION HARDENING EFFECTS OF EXPANDED CLAY CONCRETE
DOI:
https://doi.org/10.31650/2786-6696-2024-8-50-64Keywords:
accelerated carbonization hardening, experimental planning, optimality according to the combined criterion, desirability function.Abstract
The paper examines the data obtained during the study of accelerated carbonization hardening of expanded clay concrete. The mechanisms and methods of carbonization hardening, the influence of recipe and technological factors on strength characteristics are considered. The most significant of them were the consumption of the binder, the relative amount and granulometry of the filler (ground limestone) and aggregate (keramzite), the concentration of the plasticizing additive (SYM) and the technological parameters of carbonization ‒ the maximum pressure and time of carbonization. The nature of the influence of the relevant properties on the strength characteristics is considered. The results of the planned and implemented experiment were studied using the methodology of response surfaces. Experimental-statistical models of compressive strength were built for 1 hour, 28 days and 180 days from the end of the carbonation procedure. The degrees of influence of various factors are determined. Constructed dependencies were displayed using a series of diagrams of isolines of strength at the limit values of three factors of weak influence. The proposed hypothesis is that in experimental-statistical models of the properties of materials closely related to their structure, a tendency to simplification is created when the corresponding materials pass through the stage of structure formation. Insignificant components of the experimental-statistical model, mainly related to the interaction of factors determining the structure of the material, are reduced. Corresponding transformations arise, in particular, for constructed strength models. Two tasks of optimizing the long-term strength of expanded clay concrete are formulated. The first task is related to the elimination of hard additional constraints during optimization, while the long-term strength reaches its maximum. The second engineering-based task contains additional requirements for the economical use of binder and the convenience of the carbonization process. The distributions of the parameters of the desirability function were determined for both tasks. As a result of the optimization, two main sets of recipe-technological factors and corresponding properties of composite materials were obtained.
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