Creep Deformation of Ultra-Rapid-Hardening Cement-Type Bonded Anchor

Abstract eng:
This study conducted creep tests for inorganic and organic types of post-installed anchors. The slope of the load displacement curve at the time of the bond strength test and the beginning of the creep test was equivalent to approximately 1/3 of the ultimate load. The slope of the inorganic-type anchor was more than 1.5 times that of the organic type. The displacement at creep failure during the creep test was approximately two times that at the ultimate load regardless of the anchor type. The times to reach the displacement at the ultimate load were estimated at the free and load ends. The estimated value from the result of the free end was smaller than that from the load end. Accordingly, a remarkable difference between the estimated values from the load and free ends was observed in the specimen with a small amount of creep deformation. The displacement variation of 1 to 90 days was examined to estimate the creep limit of the post-installed anchors. The displacement variation in the organic-type anchor became quite larger at a stress level of approximately more than 0.50. In comparison, the variation of the inorganic-type anchor increased at a stress level of ~0.6–0.7. Assuming that the creep limits of the post-installed anchors were represented by the inflection points of the variation–stress level curves, the creep limits of the inorganic and organic types are ~0.6–0.7 and ~0.50, respectively.

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