Study on Size Effect in Bond Splitting Behavior of ECC
Study on Size Effect in Bond Splitting Behavior of ECC
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DOI：
10.1007/978-94-007-2436-5_17
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Asano;T. Kanakubo
中科院分区：
文献类型：
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作者：
K. Asano;T. Kanakubo
为了研究工程水泥基复合材料（ECC）与钢筋的局部粘结性能，进行了拉拔试验。钢筋周围ECC保护层厚度的大小有可能影响纤维的取向，从而影响纤维的桥接性能。为了评价尺寸效应，试件的主要参数是钢筋直径和保护层厚度。试件的形状是基于钢筋直径的相似形状。从试验结果来看，粘结强度随保护层厚度的增加而增加。此外，粘结强度随钢筋直径的增大而减小。为了评价尺寸效应，将钢筋周围的圆柱体定义为高应力体。对于各覆盖层厚度的试件，随着高应力体积的增加，归一化粘结强度降低。
This paper describes the test results of the pullout test in order to obtain the local bond behavior between Engineered Cementitious Composites (ECC) and steel reinforcing bar. There is a possibility that the size of cover thickness of ECC around reinforcing bar affects the orientation of fiber, so bridging performance of fiber is influenced by specimen size. To evaluate size effect, the main parameters of specimens are reinforcing bar diameter and cover thickness. The shape of specimen is a similarity shape based on reinforcing bar diameter. From the test results, bond strength tends to increasing with cover thickness. Moreover, bond strength decreases with increasing reinforcing bar diameter. To evaluate size effect, cylindrical volume around reinforcing bar is defined as highly-stressed volume. As for specimen of each cover thickness, the normalized bond strength decreases with increasing of highly-stressed volume.