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A platform for research: civil engineering, architecture and urbanism
EVALUATION METHOD OF HIGH DURABILITY FINE AGGREGATE FOR CONCRETE
PROBLEM TO BE SOLVED: To provide an evaluation method capable of easily evaluating the adequacy as an aggregate for high durability concrete on a blast furnace slag fine aggregate in a short time.SOLUTION: A test piece of mortar of 8 to 20 mm on one side in size is prepared by using a blast furnace slag fine aggregate as an evaluation object, after underwater curing or vapor curing for 7 to 28 days. In a state that the test piece is immersed in an aqueous solution of cryoprotectant, a freezing and thawing test is conducted a plurality of cycles, in which freezing under -15°C or less and thawing under 5°C or more are carried out as one cycle. After completing the freezing and thawing test, the adequacy of the blast furnace slag fine aggregate as aggregate for high durability concrete is evaluated base on the ratio of the mortar remaining as a lump.SELECTED DRAWING: Figure 2
【課題】高炉スラグ細骨材について、高耐久性コンクリート用骨材としての適性を簡便且つ短期間に評価できる評価方法を提供する。【解決手段】評価対象となる高炉スラグ細骨材を用いて作成し、７〜２８日間水中養生または蒸気養生したモルタルを、一辺が８〜２０ｍｍの大きさの試験片とし、この試験片を凍結防止剤の水溶液に浸漬させた状態で、−１５℃以下の凍結工程と５℃以上の融解工程を１サイクルとする凍結融解を複数サイクル行う凍結融解試験に供し、この凍結融解試験後に塊として残存しているモルタルの割合から、高耐久性コンクリート用骨材としての当該高炉スラグ細骨材の適性を評価する。【選択図】図２
EVALUATION METHOD OF HIGH DURABILITY FINE AGGREGATE FOR CONCRETE
PROBLEM TO BE SOLVED: To provide an evaluation method capable of easily evaluating the adequacy as an aggregate for high durability concrete on a blast furnace slag fine aggregate in a short time.SOLUTION: A test piece of mortar of 8 to 20 mm on one side in size is prepared by using a blast furnace slag fine aggregate as an evaluation object, after underwater curing or vapor curing for 7 to 28 days. In a state that the test piece is immersed in an aqueous solution of cryoprotectant, a freezing and thawing test is conducted a plurality of cycles, in which freezing under -15°C or less and thawing under 5°C or more are carried out as one cycle. After completing the freezing and thawing test, the adequacy of the blast furnace slag fine aggregate as aggregate for high durability concrete is evaluated base on the ratio of the mortar remaining as a lump.SELECTED DRAWING: Figure 2
【課題】高炉スラグ細骨材について、高耐久性コンクリート用骨材としての適性を簡便且つ短期間に評価できる評価方法を提供する。【解決手段】評価対象となる高炉スラグ細骨材を用いて作成し、７〜２８日間水中養生または蒸気養生したモルタルを、一辺が８〜２０ｍｍの大きさの試験片とし、この試験片を凍結防止剤の水溶液に浸漬させた状態で、−１５℃以下の凍結工程と５℃以上の融解工程を１サイクルとする凍結融解を複数サイクル行う凍結融解試験に供し、この凍結融解試験後に塊として残存しているモルタルの割合から、高耐久性コンクリート用骨材としての当該高炉スラグ細骨材の適性を評価する。【選択図】図２
EVALUATION METHOD OF HIGH DURABILITY FINE AGGREGATE FOR CONCRETE
高耐久性コンクリート用細骨材の評価方法
TAKAHASHI KATSUNORI (author) / WATANABE KEIJI (author) / AYANO KATSUNORI (author) / FUJII TAKASHI (author) / HABARA TOSHISUKE (author)
2017-06-15
Patent
Electronic Resource
Japanese
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