The construction works of LNG inground storage tanks at Sodegaura Thermal Power Station of Tokyo Electric Power Co. Inc. involve mass concrete for walls of 2-4 m in thickness. Strength requirement is 300kg/cm
2. In order to meet the requirement and to reduce the thermal stress by heat hyderation of cement, superplasticized concrete is employed. The concrete of 25,000m
3 has already been pored. This report describes pre-construction experiments about the concrete, thermal stress analysis, and the work results.
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