Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures
This paper presents an experimental investigation of the bond-slip behaviour of reinforcing bars in fibre-reinforced lightweight aggregate concrete (FRLWAC) at ambient and elevated temperatures. Sixty-four bond-slip specimens with four target temperature exposures, two concrete covers and four steel...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/169050 |
| _version_ | 1826121684217757696 |
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| author | Kevinly, Christopher Du, Panwei Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Kevinly, Christopher Du, Panwei Tan, Kang Hai |
| author_sort | Kevinly, Christopher |
| collection | NTU |
| description | This paper presents an experimental investigation of the bond-slip behaviour of reinforcing bars in fibre-reinforced lightweight aggregate concrete (FRLWAC) at ambient and elevated temperatures. Sixty-four bond-slip specimens with four target temperature exposures, two concrete covers and four steel fibre contents were tested to failure. The experimental results showed that exposure to elevated temperature shifted failure pattern from more ductile pull-out to brittle splitting modes, and reduced the peak bond strength and toughness of bond-slip behaviour. Scanning electron microscope (SEM) images of the concrete-steel interface showed that thermal mismatch induced microcracks contributed to degradation of bond strength, in addition to temperature induced degradation of concrete materials. The temperature exposure also negated beneficial effect of concrete cover in enhancing bond behaviour. Addition of steel fibre helped in preventing brittle failure mode, enhancing bond strength in specimens with small concrete cover and improving the post-peak bond-slip behaviour at all target temperatures. A simple semi-analytical bond-slip model that considers different failure modes and incorporates fibre-reinforced concrete tensile behaviour from Swedish Code SS 812310 was proposed and validated based on the test results in this study. |
| first_indexed | 2024-10-01T05:36:14Z |
| format | Journal Article |
| id | ntu-10356/169050 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:36:14Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1690502023-06-27T08:01:07Z Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures Kevinly, Christopher Du, Panwei Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering Lightweight Concrete Elevated Temperatures This paper presents an experimental investigation of the bond-slip behaviour of reinforcing bars in fibre-reinforced lightweight aggregate concrete (FRLWAC) at ambient and elevated temperatures. Sixty-four bond-slip specimens with four target temperature exposures, two concrete covers and four steel fibre contents were tested to failure. The experimental results showed that exposure to elevated temperature shifted failure pattern from more ductile pull-out to brittle splitting modes, and reduced the peak bond strength and toughness of bond-slip behaviour. Scanning electron microscope (SEM) images of the concrete-steel interface showed that thermal mismatch induced microcracks contributed to degradation of bond strength, in addition to temperature induced degradation of concrete materials. The temperature exposure also negated beneficial effect of concrete cover in enhancing bond behaviour. Addition of steel fibre helped in preventing brittle failure mode, enhancing bond strength in specimens with small concrete cover and improving the post-peak bond-slip behaviour at all target temperatures. A simple semi-analytical bond-slip model that considers different failure modes and incorporates fibre-reinforced concrete tensile behaviour from Swedish Code SS 812310 was proposed and validated based on the test results in this study. Ministry of National Development (MND) National Research Foundation (NRF) This material is based on research/work supported by the Singapore Ministry of National Development and National Research Foundation under L2 NIC Award No. L2NICCFP1-2013-4. 2023-06-27T08:01:07Z 2023-06-27T08:01:07Z 2023 Journal Article Kevinly, C., Du, P. & Tan, K. H. (2023). Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures. Construction and Building Materials, 377, 131010-. https://dx.doi.org/10.1016/j.conbuildmat.2023.131010 0950-0618 https://hdl.handle.net/10356/169050 10.1016/j.conbuildmat.2023.131010 2-s2.0-85151025747 377 131010 en L2NICCFP1-2013-4 Construction and Building Materials © 2023 Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Lightweight Concrete Elevated Temperatures Kevinly, Christopher Du, Panwei Tan, Kang Hai Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title | Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title_full | Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title_fullStr | Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title_full_unstemmed | Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title_short | Local bond-slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| title_sort | local bond slip behaviour of reinforcing bars in fibre reinforced lightweight aggregate concrete at ambient and elevated temperatures |
| topic | Engineering::Civil engineering Lightweight Concrete Elevated Temperatures |
| url | https://hdl.handle.net/10356/169050 |
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