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Retrofitting of heat-damaged fiber-reinforced concrete cylinders using welded wire mesh configurations

Aref A. Abadel
Aref A. Abadel
   | 01 ago 2024
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Publicado en línea: 01 ago 2024
Páginas: 52 - 69
Recibido: 13 may 2024
Aceptado: 30 jun 2024
DOI: https://doi.org/10.2478/msp-2024-0021
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© 2024 Aref A. Abadel, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

The fibers utilized in this study: (a) crimped polypropylene and (b) Hooked-steel.
The fibers utilized in this study: (a) crimped polypropylene and (b) Hooked-steel.

Fig. 2.

Concrete cylinders during casting
Concrete cylinders during casting

Fig. 3.

Heated cylinders after (a) sandblasting procedure, (b) WWM jacketing, (c) mortar layer, and (d) final appearance
Heated cylinders after (a) sandblasting procedure, (b) WWM jacketing, (c) mortar layer, and (d) final appearance

Fig. 4.

Specimens inside the electrical oven prepared for heating
Specimens inside the electrical oven prepared for heating

Fig. 5.

The time-temperature curves employed in this research
The time-temperature curves employed in this research

Fig. 6.

Test setup used in this research
Test setup used in this research

Fig. 7.

Representative typical failure mode for control and strengthened specimens
Representative typical failure mode for control and strengthened specimens

Fig. 8.

Effectiveness of WWM strengthening for unheated and heated specimens: (a) room temperature and (b) heated at 600°C
Effectiveness of WWM strengthening for unheated and heated specimens: (a) room temperature and (b) heated at 600°C

Fig. 9.

Stress-strain curves for unheated and heated specimens: (a) room temperature and (b) heated at 600°C
Stress-strain curves for unheated and heated specimens: (a) room temperature and (b) heated at 600°C

Fig. 10.

Effect of fiber types on compressive strength of unheated and heated specimens
Effect of fiber types on compressive strength of unheated and heated specimens

Test matrix

Concrete mix Specimens ID Percentage of fiber by volume Temperatures Strengthening No. of specimens
Polypropylene (PP) Steel (SF) Total
M-C0 C0-RT – – – 26°C – 3
C0-600 600° C 3
C0-RT-S 26°C WWM 3
C0-600-S 600°C 3
M-SF SF-RT – 0.6 0.6 26°C – 3
SF-600 600°C 3
SF-RT-S 26°C WWM 3
SF-600-S 600°C 3
M-PPF PPF-RT 0.2 0 0.2 26°C – 3
PPF-600 600°C 3
PPF-RT-S 26°C WWM 3
PPF-600-S 600°C 3
M-SF+PPF SF+PPF-RT 0.2 0.6 0.8 26°C – 3
SF+PPF-600 600°C 3
SF+PPF-RT-S 26°C WWM 3
SF+PPF-600-S 600°C 3
Total No. of specimens 48

Summary of test results

Specimen ID Compressive strength Initial stiffness
(MPa) Relative Variation* (N/mm) Relative Variation*
C0-RT 30.2 – 20133.3 –
C0-600 14.1 −53.3% 2169.2 −89.2%
C0-RT-S 50.6 +67.5% 25948.7 28.9%
C0-600-S 29.9 −1.0% 8542.9 −57.6%
SF-RT 40.7 – 26688.5 –
SF-600 28.5 −29.9% 4560.0 −82.9%
SF-RT-S 71.0 +74.4% 47333.3 77.4%
SF-600-S 56.5 +38.8% 19316.2 −27.6%
PPF-RT 32.9 – 43866.7 –
PPF-600 18.0 −45.3% 3600.0 −85.0%
PPF-RT-S 60.1 +82.7% 25849.5 8.0%
PPF-600-S 34.5 +4.9% 11311.5 −52.7%
SF+PPF-RT 40.5 – 27000.0 –
SF+PPF-600 30.9 −23.7% 4414.3 −83.7%
SF+PPF-RT-S 66.1 +63.2% 46386.0 71.8%
SF+PPF-600-S 44.3 +9.4% 14644.6 −45.8%

WWM and mortar properties

Material Unit Values
WWM Thickness per layer mm 0.6
Elastic modulus MPa 108
Yield stress MPa 382
Ultimate stress MPa 544
Mortar for WWM composite Compressive strength-28 day MPa 45
Tensile strength-28 day MPa 3.8
Bond strength MPa 0.79

Mix proportions used for concrete in kg/m3

Material Weight
Cement 378
Crush sand 294
Silica sand 489
Coarse aggregate (dagg.= 20 mm) 675
Coarse aggregate (dagg. = 10 mm) 320
Water 190.5
Super-plasticizer 1.0 Liters

Physical and mechanical properties of fibers

Properties Fiber Type
Polypropylene (PP) Steel (SF)
Shape Crimped Hooked ends
Length (mm) 50 60
Section dimensions (mm) 1.0 × 0.6 (Rectangular) 0.75 (Circular)
Specific gravity 0.90 7.85
Modulus of elasticity (GPa) 4.0 200
Tensile strength (MPa) 550 1225
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Temas de la revista:
Materials Sciences, other, Nanomaterials, Functional and Smart Materials, Materials Characterization and Properties
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