Distance between Clamps for Evaluating Shear Bond Strength in Direct Shear Test

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  • 一面せん断試験でせん断付着強度を評価するためのクランプ間距離
  • イチメンセンダンシケン デ センダンフチャク キョウド オ ヒョウカ スル タメ ノ クランプ カン キョリ

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Abstract

<p>Direct shear tests and 4-point bend tests were conducted to determine loading condition for evaluating shear bond strength in direct shear test. Direct shear tests using specimens which have rough bonded interface between concrete and polymer cement mortar (PCM) performed in conditions of distance between clamps of 1 to 7 mm showed similar shear bond strength regardless of difference in distance between clamps. This result allows direct shear test to be performed in a condition of narrow distance between clamps to prevent detachment at bonded interface due to bending stress. Shear bond strength and bending bond strength of bonded interfaces between concrete or mortar and PCM bonded in the same conditions were evaluated. Based on the ratio of bending bond strength to shear bond strength and loading condition of direct shear test, range of distance between bonded interface and upper clamp which cause detachment at bonded interface due to shear stress were derived.</p>

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