Popruga D. Durability of abutting joints at amplification of ferroconcrete flexural members in contracted area.

Influence of durability of contact joints on synthetic resin adhesive, wooden dowels and armature oversize is analyzed and compared. These contact joints are made of ferroconcrete layer at amplification of ferroconcrete flexural members in contracted area for reinforced samples durability, crack-resistance and deformability. The most efficient way of contact joint placing is determined taking into consideration carrying force, exploitation properties and economic indices. Carrying force calculation methods of test-pieces are worked out. Physical and mechanical characteristics of concretes in dressing wastes of ore mining and processing enterprises and armature of A400C class are considered. New developments and achievements of ferroconcrete theory for constructs are taken into account