Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Comparison of the Behavior of RC Slab Repaired with Cement-Based Mortars Containing Nanoparticles and CFRP Sheets under Monotonic Loading and Fatigue

Document Type : Original Article

Authors
hossein Nematian jelodar 1
Ata Hojat kashani 2
Rahmat Madandoust 3
Abbas Akbarpour 4
seyed azim hosseini 5
1 Assistant Professor, Department of civil Engineering, Chalus Branch, Islamic Azad University, Chalus, Iran.
2 Assistant Professor, Department of civil Engineering, Chalus Branch, Islamic Azad University, Chalus,, Iran.
3 Professor,, Department of civil Engineering, University of Guilan,, Rasht,, Iran.
4 Assistant Professor, Department of Civil Engineering,South Tehran Branch, Islamic Azad University, Tehran, Iran
5 Associate Proffessor, Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
10.22065/jsce.2024.436367.3331
Abstract
In this the Experimental study, circular fiber concrete slabs was based on the ASTM C1550 standard, which have not yet been repaired, with a concrete mixing design based on the target compressive strength of 45 MPa consisting of Macrosynthetic fibers equal to 0.5% of The concrete volume, made and subjected to monotonic loading after curing for a period of 28 days, Then the cracked fiber concrete slabs were repaired with repair mortars, CFRP sheet separately and again subjected to monotonic loadings. Also, the slabs repaired with repair mortars have been subjected to fatigue loading with 10000 cycles monotonic loading after Fatigue. Mortars include two types of cement-based mortars with 2% Nano-silica+8% Micro-silica (NS2SF8) and 0.75% polyvinyl alcohol fibers+10% Micro-Silica (PVA0.75SF10). CFRP sheets have been used in two designs including sheet and full. The behaviour of the slabs including the displacement, the bending capacity of the slab, the type and propagation of cracks and amount of energy absorption of the slabs have been investigated. The results have shown that the recovery of flexural capacity of slabs repaired with CFRP1, CFRP2 sheets and the slab repaired with PVA0.75SF10 and NS2SF8 repair mortars was 118%, 96%, 65% and 52%, respectively, compared to the control sample. Fiber concrete slab repaired with PVA0.75SF10 repair mortar, under the effect of monotonic loading, has the largest vertical displacement equal to 25.3 mm compared to other repaired slabs and has a better behaviour pattern in the range after the final strength (post-peak), ratio it has shown itself to other signifiers. Fatigue loading in restored slabs with PVA0.75SF10 and NS2SF8 restoration mortars has reduced the absorbed energy 79% and 52%, respectively, compared to the control sample.
Keywords
Fiber concrete
Repair mortars
Nanoparticle
PVA fiber
Monotonic and fatigue loadings

Subjects

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Journal of Structural and Construction Engineering
Volume 11, Issue 11 - Serial Number 88
February 2025
Pages 247-266

  • Receive Date 24 January 2024
  • Revise Date 07 May 2024
  • Accept Date 05 June 2024