Исследование дифференциальных прочностных и деформативных характеристик центрифугированных и виброцентрифугированных бетонов на активированном портландцементе

Abstract

In this work, a study of the strength and deformation characteristics of the variatropic layers of centrifuged and vibrocentrifuged concretes on activated Portland cement was carried out. Mechanical activation of cement was carried out using a specialized grinding unit - a planetary ball mill "Aktivator-4M". The optimal mode of grinding Portland cement is proposed. For the manufacture of centrifuged and vibrocentrifuged samples, an experimental laboratory centrifuge TsSRL-1 with a DC electric motor with thyristor power supplies was used, and the form vibrations were carried out due to additional dowels (protrusions) put on the shafts. 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 is proposed for obtaining small-sized samples to determine the strength and deformative characteristics of various layers of a sample by cutting them out of a common annular section. According to the results of the study, it was found that the activation of Portland cement at its rational values ​​is the optimal way to enhance variatropia.