STUDY OF EFFICIENCY OF NEWLY DEVELOPED SUPER LOW DRYING-SHRINKAGE CONCRETE USING HYBRID ADMIXTURE AND EXPANSIVE ADDITIVE

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  • ハイブリッド高性能AE減水剤と膨張材を併用した超低収縮コンクリートの開発と効果の確認
  • ハイブリッド コウセイノウ AE ゲンスイザイ ト ボウチョウザイ オ ヘイヨウ シタ チョウテイシュウシュク コンクリート ノ カイハツ ト コウカ ノ カクニン

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A new type admixture was developed for a super low drying-shrinkage concrete with water-cement ratio of 40-50%. The properties of fresh and hardened concrete using this admixture and expansive additive were studied by laboratory test and mock-up test. Drying-shrinkage of the super low drying-shrinkage concrete using this admixture was 16-22% less than ordinary concrete. Properties of this hardened concrete, as compressive strength, young’s modulus, tensile strength, durability and carbonation were determined by this experimental tests. Effect of reducing cracks by using this admixture and expansive additive was verified by test on drying shrinkage cracking of restrained concrete and mock-up slab test.

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