Abstract
Reducing the consumption of the most widespread and expensive in construction inorganic binder of hydration hardening type - Portland cement - is one of the most important tasks for the construction industry. With the current trend of resource- and energy-saving, as well as a decrease in environmental pressure, it is of great interest to use wastes from fuel and energy enterprises in the form of various types of ash (acidic, basic), which are finely dispersed raw materials of mainly aluminosilicate composition that have accumulated in large quantities on our country territories. The paper analyzes the effect of mineral additives in the form of fuel ashes, the use of which provides replacement of part of Portland cement (15-30 % of the total mass of Portland cement, in increments of 5 %), on the kinetics of hardening of the binder. Based on the results of the strength tests of binder samples with additives, calculation of predicted strength was carried out according to the methodology by Sh.M. Rakhimbayev based on transfer theory. As a result, the analysis of the kinetics of the Portland cement hardening was carried out both at early and late hardening periods; efficiency and optimal concentration of fuel ashes depending on type have been established.
Highlights
Mechanical, and microstructural properties of high strength self-compacting concrete by marble cutting slurry waste, fly ash, and silica fume // Construction and Building Materials. 2020. 239,117888
The paper analyzes the effect of mineral additives in the form of fuel ashes, the use of which provides replacement of part of Portland cement (15–30 % of the total mass of Portland cement, in increments of 5 %), on the kinetics of hardening of the binder
The analysis of the kinetics of the Portland cement hardening was carried out both at early and late hardening periods; efficiency and optimal concentration of fuel ashes depending on type have been established
Summary
Анализ кинетики твердения портландцемента с использованием минеральных добавок в виде топливных зол в первые 28 суток показывает, что при использовании кислой (или низкокальциевой) золы Троицкой ГРЭС прочность вяжущего при всех концентрациях превышает этот же показатель для контрольного образца На основании анализа кинетики набора прочности образцов вяжущего на основе портландцемента с использованием минеральных добавок в виде топливных зол различных типов можно сделать вывод, что наиболее эффективной сточки зрения достижения марочной прочности модифицированного вяжущего показывает себя кислая топливная зола Троицкой ГРЭС, что не противоречит сложившимся представлениям о влиянии зол на цементные системы. Что использование кислой топливной золы Троицкой ГРЭС в любом количестве снижается начальная скорость, тогда как при использовании основной топливной золы Назаровской ТЭС, в частности при использовании 30 %, этот коэффициент возрастает по отношению к данному коэффициенту для контрольного контрольного состава на 5 %. Таблица 2 Результаты расчёта по уравнениям теории переноса для вяжущего, модифицированного кислой топливной золой Троицкой ГРЭС
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