Abstract
The world experience of implementation and the uniqueness of building alkaline composites prove the prospects and relevance of the development of clinker-free technology. The development of formulations of alkaline activation binders based on fine powders of aluminosilicate nature will allow obtaining new effective and high-quality products. The paper investigates the effect of active microsilica on the kinetics of strength gain, changes in density and pore space of cement stone, formulation and technological factors and hardening conditions. The chemical transformations of active silica under alkaline conditions, leading to changes in the pH value, have been substantiated. By electron microscopy, the foundations of the formation of the structure of a cement stone on a binding bond "aspiration dust (60%) - clinker dust (40%) - microsilica - Na2SiO3" amorphous substance, calcium sulfoaluminates, calcium hydroaluminates are developed. According to authors, the research results are important for the construction industry, since the proposed formulations of clinker-free cements can replace expensive and energy-intensive Portland cement, making it possible to create strong and durable concrete and reinforced concrete structures
Highlights
The development of formulations of alkaline activation binders based on fine powders of aluminosilicate nature will allow obtaining new effective and high-quality products
The paper investigates the effect of active microsilica on the kinetics of strength gain, changes in density and pore space of cement stone, formulation and technological factors and hardening conditions
The research results are important for the construction industry, since the proposed formulations of clinker-free cements can replace expensive and energy-intensive Portland cement, making it possible to create strong and durable concrete and reinforced concrete structures
Summary
ИССЛЕДОВАНИЕ ВЛИЯНИЯ ДОБАВКИ АКТИВНОГО МИКРОКРЕМНЕЗЕМА НА СВОЙСТВА ВЯЖУЩИХ ЩЕЛОЧНОЙ АКТИВАЦИИ Методами электронной микроскопии развиты основы формирования структуры цементного камня на вяжущей связке «аспирационная пыль (60 %) – клинкерная пыль (40 %) – микрокремнезем – Na2SiO3», фазовый состав характеризуется присутствием гидроалюмосиликатов натрия и кальция, кристаллических новообразований близких к ларниту и их гидратов, аморфной субстанции, сульфоалюминатов кальция, гидроалюминатов кальция.
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