Abstract
In this work, a study of the integral strength and deformation characteristics of centrifuged and vibrocentrifuged concretes on activated Portland cement is carried out. Mechanical activation of cement was carried out using a specialized grinding unit. The manufacture of centrifuged and vibrocentrifuged samples was carried out on an experimental laboratory centrifuge. All samples were made from concrete of the same composition. In total, four basic samples of annular cross-section were manufactured and tested with the following dimensions: outer diameter D = 450 mm; inner hole diameter d = 150 mm; total height H = 1200 mm. The optimal values of technological parameters of centrifugation and vibrocentrifugation are given. A scheme has been developed for obtaining small-sized samples from a common annular section to determine the strength and deformation characteristics. According to the results of the study, it was found that an improvement in the values of integral strength and deformation characteristics when using activated Portland cement is observed in both centrifuged and vibrocentrifuged samples. It was found that samples made by vibrocentrifugation technology have the best strength and deformation characteristics than samples made by centrifugation. The conclusion is made about the technology of vibrocentrifugation as the most preferable for the manufacture of reinforced concrete products of annular section.
Highlights
В качестве вяжущего применялся портландцемент марки ПЦ 400 Д0, в таблице 2 представлены его физико-механические характеристики, а в таблице 3 – его минералогический состав
All samples were made of concrete of the same composition
A scheme has been developed for obtaining small-sized samples from a common annular section to determine strength and deformation characteristics
Summary
В качестве вяжущего применялся портландцемент марки ПЦ 400 Д0, в таблице 2 представлены его физико-механические характеристики, а в таблице 3 – его минералогический состав. Наименование свойства Тонкость помола, проход через сито No 008, % Удельная поверхность, см2/г Нормальная густота цементного теста, % Сроки схватывания, час:мин -начало - конец Предел прочности при сжатии в возрасте 28 суток, МПа
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