|Table of Contents|

Effect of loading rate on bond properties of steel fiber and ultra-high performance concrete (PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年5期
Page:
62-72
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Effect of loading rate on bond properties of steel fiber and ultra-high performance concrete
Author(s):
YUAN Ming1;  WU Xiao-juan1;  YAN Dong-huang1;  LIU Yun1; 2;  HUANG Lian1
(1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 2. School of Road and Bridge Engineering, Hunan Communication Polytechnic, Changsha 410132, Hunan, China)
Keywords:
bridge engineering;  ultra-high performance concrete;  steel fiber;  bonding performance;  loading rate;  matrix strength
PACS:
U446
DOI:
10.19721/j.cnki.1671-8879.2022.05.007
Abstract:
In order to gain a deeper understanding of the bonding properties of UHPC, further define the failure mode of the bonding interface between the steel fiber and the UHPC matrix under different loading rates, and the factors effecting the fiber rate sensitivity. Single-fiber drawing performance of ultra-high performance concrete(UHPC)matrix embedded with high-strength steel fibers under different loading rates were studied. The test variables were fiber type(straight round, end-hooked, corrugated), loading rate(from 0.5 to 5 mm/min)and matrix strength(77.10, 90.50, 111.33 MPa). A total of 27 sets of samples were made. Under different loading rates, the maximum tensile stress, pull-out energy, equivalent bond strength and average bond strength of the fiber were characterized and analyzed. The apparent morphology of the fiber and the morphology of the matrix tunnel after fiber being pulled out were observed and discussed with the aid of the scanning electron microscope(SEM). The results show that the drawing performance of different fiber types is sorted from large to small as follows, straight round fiber, end-hooked fiber, corrugated fiber. And it is observed in SEM that all the pulled-out fibers have different degrees of scratches on the surface, and tiny matrix particles are attached. The matrix tunnels appear different degrees of micro-cracks, and the pull-out of the end-hooked fibers also cause matrix spalling near the pull-out exit. The speed sensitivity of the fiber is found to be related to matrix strength. With the increase of matrix strength, the speed sensitivity of the straight round fiber first decreases and then increases, the maximum pull-out load, pull-out work, the equivalent bond strength and strength utilization rate increase by 42.9%, 160.7%, 160.8% and 21%, respectively. The rate sensitivity of the end-hooked fiber reduces but the maximum pull-out load reaches 226.71 MPa, and the strength utilization rate of the material is as high as 134%. The rate sensitivity of the corrugated fiber increases, the maximum breaking load increases by 8.9%, and the maximum material strength utilization rate reaches 68%. The speed sensitivity of the fiber is also related to the type of fiber, the order from large to small of rate sensitivity of fibers is corrugated fiber, end-hooked fiber, straight round fiber. In addition, the UHPC matrix itself is rate-sensitive, and has a positive correlation with straight round and end-hooked fibers, and a negative correlation with corrugated fibers. A reference for further understanding the mechanical properties of steel fiber reinforced ultra-high performance concrete can be provided.5 tabs, 13 figs, 25 refs.

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Last Update: 2022-09-30