When testing of fiber reinforced composite materials (esp for rebar used for concrete reinforcement) acid durability, is there a any available standard for it?
Usually, deterioration of concrete increases as the pH of the acid decreases. In fact, no hydraulic cement concrete, regardless of its composition, will hold up for long if exposed to a solution with a pH of 3 or lower.
Therefore there is no need to assess the acid durability of reinforcements in concrete.
Usualy, to protect concrete from such severely acidic environments, surface treatments are often used. I heard about a book - Effects of Substances on Concrete and Guide to Protective Treatment which describes strategies for dealing with attack by acids, and corrosion of reinforcing steel and nonferrous metals. Maybe you may find some information there. Usually durability is expressed in the loss of material and reducing resistance to various stresses over time. A series of laboratory tests must be conducted. The procedure is not standardized.