| 摘要 |
PROBLEM TO BE SOLVED: To suitably determine selection of cement and aggregate for use in concrete, and the kind and amount of an ammonia gas reducing admixture to be mixed in the concrete while considering all conditions of the performance required for a structure, and of the workability and costs when the structure is constructed. SOLUTION: An ammonia gas concentration level which is not affected by ammonia gas generated from a concrete structure is set beforehand (S1), and designing conditions of the building structure and environmental conditions during the construction period are set beforehand. Thus, the tolerance of the amount of ammonia gas generated from the concrete is predicted and set based on the serviceability and designing conditions of the structure (S2). When the amount of ammonia gas generated from the concrete is regulated with respect to the tolerance, regulation is made on at least one of the following elements consisting of the kind of the cement, the kind of the aggregate, selection of the ratio between water and a binder, the kind of an ammonia gas reducing admixture for the concrete, the amount of the ammonia gas reducing admixture to be added, and coating or affixture of an ammonia gas adsorbent or an ammonia gas decomposing material onto the concrete surface.
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