高強度高流動コンクリートの初期の乾燥による質量減少と自由収縮に関する研究

概要

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Drying weight loss and shrinkage at early ages of a high-strength flowing-concrete, using a one-pack type special admixture with a bodying agent, were studied by experiments with variable parameters including water-cement ratio, unit amount of water, type of cement and type of admixture. Major findings are as follows. (1) Regardless of the type of concrete, progress of shrinkage was significant when the weight loss was less than 1%. The shrinkage can be attributed to both drying and the other factors including hydration and autogeneous. (2) Progress of shrinkage was significant in the first 1 to 2 hours of drying (at the age of 3 to 4 hours) regardless of the type of concrete. Among mix parameters, water-cement ratio and unit water content had a larger influence on the shrinkage than type of cement and type of admixture. (3) When an ordinary portland cement was used, shrinkage at early ages of the concrete, with low water-cement ratio 0.27 and 0.3, became larger than that with water-cement ratio of 0.45 though their drying weight losses were smaller.
社団法人日本建築学会の論文
1998-09-30