DETERIORATION PREVENTING AGENT FOR CONCRETE OR MORTAR AND METHOD FOR PREVENTING DETERIORATION OF CONCRETE OR MORTAR

摘要

PROBLEM TO BE SOLVED: To provide a deterioration preventing agent for concrete or mortar effective for preventing the deterioration of a concrete construction such as a sewage facility by sulfuric acid generated by the action of sulfur-oxidizing bacteria and provide a method for preventing the deterioration of concrete or mortar by using the preventing agent. SOLUTION: The deterioration of concrete or mortar can be prevented by making a concrete or mortar include a deterioration preventing agent containing a metallophthalocyanine expressed by the formula MXn Pc (M is a metal atom; X is oxygen atom, a halogen atom or hydroxyl group; Pc is phthalocyanine skeleton; (n) is an integer of 1-5) or its derivative as an active component in concrete or mortar, thereby causing bacteriostatic and/or bactericidal effect on sulfur-oxidizing bacteria. The deterioration of concrete or mortar can be prevented effectively over a long period by this process without polluting water and the process is especially effective for preventing the deterioration of concrete construction of sewage facility, etc.