コンクリート補強用繊維の引抜過程における載荷速度依存性

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Loading rate dependency or time-dependent properties of the pullout resistance of fibers are indispensable to estimate the long-term stability of fiber reinforced concrete. In this study, the accurate and easy testing method recently proposed by the authors was applied to obtain the loading rate dependency of pullout resistance of fibers. The advantage of the method is that a few samples are enough for testing.Pullout test was conducted pulling a single steel, PET or polypropylene (PP) fiber out of the mortar sample by a servo-controlled testing machine. In the test, displacement rate (pulling out speed of the fiber) was alternately changed between low and high values. Two pullout resistance-displacement curves corresponding to the low and the high rates were obtained. The difference of two curves indicates the degree of loading rate dependency of the fiber.Experimental results indicate that steel fiber shows only very weak dependency suggesting that, in most cases, time-dependency is negligible small. Loading rate dependency of the peak pullout resistance for two plastic fibers was considerably stronger than that of steel fiber, though slightly weaker than that of mortar. After the peak value, loading rate dependency of PET fiber is becoming gradually weaker with increase of displacement. On the other hand, that of PP fiber is becoming stronger indicating more care should be paid for PP especially when PP reinforced concrete has been fissured or cracked.
社団法人資源・素材学会の論文
2005-11-25

コンクリート補強用繊維の引抜過程における載荷速度依存性

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