Abstract
In the work, basalt fiber reinforced polymer rebars exposed in the climatic conditions of the North for 51 months have been investigated. To study the formation of macrodamages, fractographic and structural studies of longitudinal sections of the rebars were carried out. The open porosity of basalt fiber reinforced polymer rebars was investigated by the method of hydrostatic weighing. The influence of microdamages on the formation of open porosity of basalt fiber reinforced polymer rebars during their aging is shown. It has been found that degradation of basalt fiber reinforced polymer rebars leads to a significant increase in their open porosity. A linear expression is proposed to assess the average porosity of basalt fiber reinforced polymer rebars depending on their diameter, the concentration of reinforcing fiber rovings, etc. Estimated calculations of the average porosity of basalt fiber reinforced polymer rebars with their uniform degradation from the outer surface under the influence of the external environment have been carried out. A satisfactory correlation of estimated calculations and experimental data of average porosity at small diameters of basalt fiber reinforced polymer rebars (with diameters of 6 and 8 mm.)
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