On mitigating rebar–concrete interface damages due to the pre-cracking phenomena using superabsorbent polymers

•Low dosage of SAP has comparable bond strength in uncracked concrete.•Large-size SAP has similar bond strength, as compared to the smaller size.•High dosage of SAP has considerable effect on self-healing at rebar-concrete interface.•Self-healing at rebar-concrete interface has no effect on splittin...

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Bibliographic Details
Published in:Construction & building materials 2020-08, Vol.253, p.119181, Article 119181
Main Authors: Mousavi, Seyed Sina, Ouellet-Plamondon, Claudiane M., Guizani, Lotfi, Bhojaraju, Chandrasekhar, Brial, Victor
Format: Article
Language:English
Subjects:
Bond-slip
Pre-cracking phenomena
Reinforced concrete
Self-healing
Steel rebar
Superabsorbent polymers (SAP)
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Summary:•Low dosage of SAP has comparable bond strength in uncracked concrete.•Large-size SAP has similar bond strength, as compared to the smaller size.•High dosage of SAP has considerable effect on self-healing at rebar-concrete interface.•Self-healing at rebar-concrete interface has no effect on splitting bond failure.•EDS test confirms a considerable mass percent of calcium in the healed products. This study intends to determine the effects of incorporating superabsorbent polymers (SAP) within concrete on the bond properties of steel reinforcing bars (rebar) embedded in uncracked and pre-cracked concrete. An experimental program is conducted to check the performance of SAP, as a healing agent inside the concrete, in mitigating internal damage at the rebar-concrete interface due to the pre-cracking phenomena. Two types of SAP with different particle sizes (0.15 and 0.50 mm) and chemistries are considered in the experimental program. Pull-out test results show improved bond properties of steel rebars embedded in uncracked and healed concrete containing lower dosages of SAP. However, concrete containing a high dosage of SAP shows lower bond strength, compared to normal concrete, due to the presence of macro voids. A considerable healing effect is observed for the initial bond-slip curve portion, the bond strength, and the energy absorbed by the bond mechanism, within the cracks of pre-cracked SAP-modified concrete subjected to wet-dry cycles. This study shows that SAP can significantly increase the autogenous healing performance of concrete at rebar-concrete interfacial damage sites.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2020.119181