| 摘要 |
PROBLEM TO BE SOLVED: To provide a waterproof technique using an inorganic flame-retardant having an excellent flame-retardant effect in construction and after construction free from using phosphor material and organic material as compared with the conventional technique, reducing emission of smoke accompanying toxic gas, having improved working efficiency as compared with the conventional technique in waterproofing to an existing concrete bridge structure and especially to an expandable joint, capable of reducing working force and easy to apply to a joint having more complicated shape. SOLUTION: This method forming a waterproof layer on a concrete joint part in the waterproof technique for the concrete bridge structure characteristically uses a composition of an aqueous inorganic film-forming compound in a conventional application method. For example, the urethane tar based grouting filler composition obtained by mixing the aqueous inorganic film-forming compound with a hardener is poured into a concrete expandable joint part, the part is usable after hardening starts.
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