HEAVY CONCRETE BASED ON A POLYDISPERSE BINDER INCORPORATING A COMPLEX MODIFIER

Abstract

Efficient use of reclaimed lands requires durable and reliable concrete materials for irrigation structures. This study addresses methods for improving the performance characteristics of heavy concrete intended for hydraulic reclamation applications. The aim of the research is to develop a scientifically substantiated technological solution for producing heavy concrete based on a polydisperse binder with a controlled particle size distribution, combined with a complex chemical–mineral modifier (superplasticizer, polymer, and microsilica) and micro-reinforced with basalt fiber. The research methodology is based on the system–structure–property approach and employs the Drop & Roll algorithm to optimize dense particle packing. Experimental investigations included laser particle size analysis, X-ray diffraction, scanning electron microscopy, and standard methods for determining the physical, mechanical, and performance properties of cement stone and concrete. It was established that the optimized binder composition (15% with a specific surface area of 150 m²/kg, 75% with 300 m²/kg, and 10% with 450 m²/kg), in combination with 0.3% superplasticizer, 0.2% polymer admixture, and 15% microsilica, ensures the formation of a dense fine-crystalline cement stone structure with crystal sizes of 60–75 nm. The developed concrete demonstrates high performance, with a compressive strength of 77.3 MPa, flexural strength of 8.62 MPa, water absorption of 1.9%, water impermeability grade W14, and frost resistance up to F600, confirming the feasibility of its application in hydraulic reclamation structures.