減圧注入工法によるプレパックドコンクリートに関する研究 : その 1 注入モルタルの流動性に関する基礎理論

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タイトル別名
  • VACUUM PREPACKED CONCRETE : Part 1 Fundamental Theories Related to Flow Properties of Grout
  • 減圧注入工法によるプレパックドコンクリートに関する研究-1-注入モルタルの流動性に関する基礎理論
  • ゲンアツ チュウニュウ コウホウ ニヨル プレパックド コンクリート ニカンス

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The vacuum prepacked concrete described here is a method for producing high quality concrete with extremely few voids, by reducing pressure of inside of the forms before injection. Flow properties measured by using rotary viscometer are compared with those observed by using irregular passes prepared with coarse aggregate or glass balls filled in the forms. These values show close agreement for Newton flow, but do not for Bingham flow as of cement mortar. For testing flow properties of injection mortar, the authors developed an implement which enables us to obtain relative shear stress yielding value (F_0), relative flow viscosity coefficient (λ), and relative closure coefficient (⊿F_0), by letting mortar flow into a cylinder filled with coarse aggregate to be actually used or model aggregate by gravity. The authors present formulae for predicting an injection pressure for prepacked concrete by utilizing these values obtained by the tests.

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