Experimental study and theoretical calculation of age-dependent shear performance of MPCC-NC interface
Magnesium phosphate cement concrete (MPCC) has great application potential in the field of concrete repair owning to its fast-hardening property. However, the bonding performance of the repaired interface is directly related to the safe service of the repaired structure. This study investigates the...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
|
| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525006850 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Magnesium phosphate cement concrete (MPCC) has great application potential in the field of concrete repair owning to its fast-hardening property. However, the bonding performance of the repaired interface is directly related to the safe service of the repaired structure. This study investigates the shear performance of the MPCC-normal concrete (NC) interface at various curing ages using push-off tests. The growth patterns of MPCC and NC mechanical performance were analyzed, and the effects of curing age on shear capacity and stiffness were evaluated. The results showed that MPCC exhibited greater early strength than NC, however, the difference diminished with curing age. The shear capacity of the roughening interface was primarily supported by bonding action, whereas the grooving interface relied on both bonding action and the shear ability of MPCC teeth. The shear performance of both interfaces increased rapidly before 7 d but slowed significantly after 7 d. Specifically, the shear capacity of the roughening and grooving interfaces increased by 69.2 and 87.89 %, respectively, before 7 d, while the maximum increases after 7 d were only 17.9 and 34.29 %, respectively. Based on the age-dependent mechanical properties of MPCC, calculation methods for predicting the shear capacity of the MPCC-NC interface were developed. The proposed methods achieved high accuracy, with errors between the calculated and tested values under 5 %. This study provides a theoretical foundation for the design and repair of MPCC-NC interfaces in engineering applications. |
|---|---|
| ISSN: | 2214-5095 |