Investigation of the integral strength and deformation characteristics of centrifuged and vibrocentrifuged concretes on activated Portland cement

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.