Abstract
The structural performance of corrosion-damaged reinforced concrete (RC) beams repaired with fabric-reinforced cementitious matrix (FRCM) was investigated. Eleven RC beams were constructed and tested in flexure under four-point load configuration. Nine beams were subjected to an accelerated corrosion process for 70 days to obtain an average mass loss of 13% in the tensile steel reinforcing bars while two other beams were tested as controls. One corroded beam was repaired with carbon fiber-reinforced polymer (CFRP) before testing for comparison. The test parameters included the number of fabric plies (1-4), the FRCM repair scheme (end-anchored and continuous U-wrapped strips), and FRCM materials [carbon and polyparaphenylene benzobisoxazole (PBO)]. Test results showed that corrosion slightly reduced the yield and ultimate strengths of the beams. The use of FRCM increased the ultimate capacity of corroded beams between 5 and 52% and their yield strength between 6 and 22% of those of the uncorroded virgin beam. Beams repaired with U-wrapped FRCM strips showed higher capacity and higher ductility than those repaired with the end-anchored bottom strips having a similar number of layers. A high gain in the flexural capacity and a low ductility index were reported for specimens with a high amount of FRCM layers. A new factor was incorporated in the design equations of the ACI 549.4R-13 to account for the FRCM scheme.
| Original language | English (US) |
|---|---|
| Article number | 04018039 |
| Journal | Journal of Composites for Construction |
| Volume | 22 |
| Issue number | 5 |
| DOIs | |
| State | Published - Oct 1 2018 |
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Keywords
- Corrosion
- Fabric-reinforced cementitious mortars (FRCM)
- Flexure
- Reinforced concrete (RC)
- Repair
- Strengthening
ASJC Scopus subject areas
- Ceramics and Composites
- Civil and Structural Engineering
- Building and Construction
- Mechanics of Materials
- Mechanical Engineering
Cite this
Corrosion-Damaged RC Beams Repaired with Fabric-Reinforced Cementitious Matrix. / Elghazy, Mohammed; El Refai, Ahmed; Ebead, Usama; Nanni, Antonio.
In: Journal of Composites for Construction, Vol. 22, No. 5, 04018039, 01.10.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Corrosion-Damaged RC Beams Repaired with Fabric-Reinforced Cementitious Matrix
AU - Elghazy, Mohammed
AU - El Refai, Ahmed
AU - Ebead, Usama
AU - Nanni, Antonio
PY - 2018/10/1
Y1 - 2018/10/1
N2 - The structural performance of corrosion-damaged reinforced concrete (RC) beams repaired with fabric-reinforced cementitious matrix (FRCM) was investigated. Eleven RC beams were constructed and tested in flexure under four-point load configuration. Nine beams were subjected to an accelerated corrosion process for 70 days to obtain an average mass loss of 13% in the tensile steel reinforcing bars while two other beams were tested as controls. One corroded beam was repaired with carbon fiber-reinforced polymer (CFRP) before testing for comparison. The test parameters included the number of fabric plies (1-4), the FRCM repair scheme (end-anchored and continuous U-wrapped strips), and FRCM materials [carbon and polyparaphenylene benzobisoxazole (PBO)]. Test results showed that corrosion slightly reduced the yield and ultimate strengths of the beams. The use of FRCM increased the ultimate capacity of corroded beams between 5 and 52% and their yield strength between 6 and 22% of those of the uncorroded virgin beam. Beams repaired with U-wrapped FRCM strips showed higher capacity and higher ductility than those repaired with the end-anchored bottom strips having a similar number of layers. A high gain in the flexural capacity and a low ductility index were reported for specimens with a high amount of FRCM layers. A new factor was incorporated in the design equations of the ACI 549.4R-13 to account for the FRCM scheme.
AB - The structural performance of corrosion-damaged reinforced concrete (RC) beams repaired with fabric-reinforced cementitious matrix (FRCM) was investigated. Eleven RC beams were constructed and tested in flexure under four-point load configuration. Nine beams were subjected to an accelerated corrosion process for 70 days to obtain an average mass loss of 13% in the tensile steel reinforcing bars while two other beams were tested as controls. One corroded beam was repaired with carbon fiber-reinforced polymer (CFRP) before testing for comparison. The test parameters included the number of fabric plies (1-4), the FRCM repair scheme (end-anchored and continuous U-wrapped strips), and FRCM materials [carbon and polyparaphenylene benzobisoxazole (PBO)]. Test results showed that corrosion slightly reduced the yield and ultimate strengths of the beams. The use of FRCM increased the ultimate capacity of corroded beams between 5 and 52% and their yield strength between 6 and 22% of those of the uncorroded virgin beam. Beams repaired with U-wrapped FRCM strips showed higher capacity and higher ductility than those repaired with the end-anchored bottom strips having a similar number of layers. A high gain in the flexural capacity and a low ductility index were reported for specimens with a high amount of FRCM layers. A new factor was incorporated in the design equations of the ACI 549.4R-13 to account for the FRCM scheme.
KW - Corrosion
KW - Fabric-reinforced cementitious mortars (FRCM)
KW - Flexure
KW - Reinforced concrete (RC)
KW - Repair
KW - Strengthening
UR - http://www.scopus.com/inward/record.url?scp=85051089519&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051089519&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0000873
DO - 10.1061/(ASCE)CC.1943-5614.0000873
M3 - Article
AN - SCOPUS:85051089519
VL - 22
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
SN - 1090-0268
IS - 5
M1 - 04018039
ER -