Development of the Large-Tonnage Pressure-Type Prestressed Anchor Cable with BFRP for Geotechnical Engineering and Its Mechanical Properties

Table 1

The material properties and parameters for developing the large-tonnage BFRP anchor cable.

Materials	Descriptions	Illustration
BFRP tendon	The BFRP tendon is made by Shanxi ECIC Basalt Development Co. Ltd., China. Its diameter is 12.60 mm and is quartz sand surface coated. The size of the quartz sand is 20.00 to 40.00 mesh. The tensile strength and elastic modulus of the BFRP tendon are 891.00 MPa and 48.45 GPa, respectively.
Steel strand	The specification of the steel strand is –21.60 mm, which meets the Chinese National Standard [22]. Its tensile strength is 1860.00 MPa, the maximum load-bearing capacity is 58.70 tonnage, and the ultimate elongation is 3.50%.
Steel sleeve	It is made of 40 Cr steel, whose inner diameter is 32.00 mm and outer diameter is 38.50 mm. The inner wall of the steel sleeve is covered with thread . When it is used as the middle connector, one component of the developed BFRP anchor cable herein, its length is 80.00 cm. When it is used as the end anchor sleeve, another element of the designed BFRP anchor cable, its length is 40.00 cm.
Epoxy resin adhesive	It is a two-part epoxy , which is produced by Nanjing Mankat Technology Co. Ltd., China. Its compressive strength is 72.40 MPa, tensile strength is 46.20 MPa, flexural strength is 70.80 MPa, shear strength is 21.40 MPa, the elastic modulus is 3.10 GPa, and the maximum elongation is 1.50%. It was used as the adhesive filler to fix the BFRP tendon and the steel strand inside the sleeve.
Circle load-bearing plate	This circle load-bearing plate was a component of the developed BFRP anchor cable herein, which was made of 40 Cr steel. It is cylindrical with seven holes; its diameter and height are 149.00 mm and 50.00 mm, respectively. Each of the holes is T shaped, whose month diameter is 39.00 mm with a height of 5 mm and whose body diameter is 31.00 mm with a height of 45.00 mm.