Test research on the effects of mechanochemically activated iron tailings on the compressive strength of concrete

Utilization of tailings in cement and concrete: A review

“…Some research [56,57] used grinding as a treatment method for tailings, and the representative particle size distributions of the tailings are given in Figure 10 after the tailings were ground at different durations [58]. Meanwhile, with the decrease of particle size and the increase of specific surface area after grinding, the internal structure and physical and/or chemical properties of tailings may change as well [25]. Besides, tailings mixed with some chemical activators were ground together by a ball mill and this is mechanical and chemical activation of tailings [59].…”

“…The foundation of using tailings as SCMs for partial replacement of cement is based on the hydration reaction of tailings with Ca(OH) 2 in cement paste, so the Ca(OH) 2 content can assess the reaction of tailings in cement paste. Cheng et al [25] figured out the contents of Ca(OH) 2 in hardened cement paste with tailings substitution as SCMs by using TG-DTA technology and the authors found that the content of Ca(OH) 2 in control hardened cement paste was 21.367%, whereas the contents of Ca(OH) 2 were 16.856% and 15.064% in hardened cement-tailings paste with tailings substitution amounts 20% and 30% respectively. They concluded that it is the pozzolanic activity of tailings which causes the secondary hydration reaction.…”

Synthesis of nomogram for the calculation of suboptimal chemical composition of the structural cast iron on the basis of the parametric description of the ultimate strength response surface

“…Связь параметров микроструктуры со свой-ствами особо отмечено в работах [15][16][17]. Так, в ра-боте [15] исследовано влияние на усталостную проч-ность чугуна микроструктурных неоднородностей: графита, литейных дефектов, структуры металличе-ской матрицы.…”

“…Описанный в данной работе метод позволяет предсказывать оценку данной выходной характеристики на основании информации о микро-структурных неоднородностях и условиях нагруже-ния. Исследования, описанные в работе [16], позво-лили установить качественное влияние модификато-ра, содержащего SiC, в сочетании с ферросилицием FeSi75, на морфологию графита, матричную структу-ру и механические свойства чугуна. Особо при этом отмечается возможность формирования большого количества микрозон с высоким содержанием угле-рода и концентрацией кремния, что способствует благоприятному протеканию процесса графитизации.…”

Strength analysis of lamellar graphite cast iron in the «carbon (C) – carbon equivalent (Ceq)» factor space in the range of C = (3,425-3,563) % and Ceq = (4,214-4,372) %

“…The studies, which are described in [5], have established qualitative impact of new SiC-containing modifier in conjunction with the ferrosilicon FeSi75 on graphite morphology, matrix structure and mechanical properties of cast iron. There is the fact of improving the properties of molten iron from the original non-inoculated state.…”