Here presented is the resistance of fly ash concrete against chloride ion penetration, carbonation, alkali-aggregate reaction and cracking, and the evalution method for workability is proposed. Based upon this knowledge, a new mix design recommendation is made by explicitly taking into account fly ash additive as hardening binder and fine powders, and the procedure of design and construction planning is summarized.

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As a countermeasure for pier mass concrete under construction of Uratakao Bridge, we study on the effect of concrete age for quality control, and on the effect of cement variation, by thermal stress analysis method.
As a result, low heat and resist shrinkage blast-furnace cement was advantageous on the point of cracking control, cost performance, and carbon-dioxide emission.
This cement is new material, and it had never been used for bridge construction work in Tama area of Tokyo. Therefore, we confirmed quality of the cements, and originally set the standard for quality control, considering that the cement show higher performance than the JIS standard one.

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[in Japanese]

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[in Japanese]

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