SUBSTANTIATION OF HIGH-STRENGTH ASH-CONTAINING MORTARS EFFECTIVE COMPOSITIONS USING MATHEMATICAL MODELS

The research is focused on obtaining high-strength mortars from composite cements, containing up to 50% of fly ash and a polyfunctional modifying admixture. The polyfunctional modifier contains a superplasticizer and an intensifier for cement grinding. Using mathematical experiments planning, experimental-statistical models of mortars strength in bending and compression at 2 and 28 days were obtained. The models take into account the influence of the fly ash amount, superplasticizer content and type and cement grinding fineness. Analytical results based on the obtained models and the influence of the investigated factors are presented. The obtained mathematical models of mortar strength allowed optimization of the required technological solutions that provide the necessary mechanical characteristics of mortars at minimum cost.