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The performance of CFRP-strengthened heat-damaged metakaolin-based geopolymer concrete cylinders containing reclaimed asphalt aggregate

Aref A. Abadel

Aref A. Abadel

Department of Civil Engineering, College of Engineering, King Saud UniversityRiyadh, Saudi Arabia
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Abadel, Aref A.
  
30 ago 2024
The performance of CFRP-strengthened heat-damaged metakaolin-based geopolymer concrete cylinders containing reclaimed asphalt aggregate's Cover Image
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Pubblicato online: 30 ago 2024
Pagine: 125 - 142
Ricevuto: 09 giu 2024
Accettato: 14 lug 2024
DOI: https://doi.org/10.2478/msp-2024-0023
Parole chiave
© 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 MK particle size used in this study
The MK particle size used in this study

Fig. 2.

Sieve analysis of the fine and coarse aggregates
Sieve analysis of the fine and coarse aggregates

Fig. 3.

Samples of the coarse aggregates used in this study. (a) Limestone aggregate. (b) RAP aggregate
Samples of the coarse aggregates used in this study. (a) Limestone aggregate. (b) RAP aggregate

Fig. 4.

Specimen preparation. (a) Cylinders during casting. (b) Cylinders ready for testing
Specimen preparation. (a) Cylinders during casting. (b) Cylinders ready for testing

Fig. 5.

The specimens strengthened by CFRP sheets
The specimens strengthened by CFRP sheets

Fig. 6.

Specimen preparation. (a) Cylinders inside the oven. (b) Time-temperature curves
Specimen preparation. (a) Cylinders inside the oven. (b) Time-temperature curves

Fig. 7.

Test setup
Test setup

Fig. 8.

Failure mode for all specimens
Failure mode for all specimens

Fig. 9.

Compressive strength of all specimens
Compressive strength of all specimens

Fig. 10.

Stress-strain curves for all concrete cylinders. (a) Room temperature. (b) Heated at 300°C
Stress-strain curves for all concrete cylinders. (a) Room temperature. (b) Heated at 300°C

Fig. 11.

The effectiveness of CFRP strengthening. (a) Unheated specimens. (b) Heated specimens
The effectiveness of CFRP strengthening. (a) Unheated specimens. (b) Heated specimens

Fig. 12.

The toughness index calculation
The toughness index calculation

Test matrix

Group Concrete mixture Specimens ID RAP aggregate Exposure to temperature Strengthening No. of specimens
Group “1” A0 A0-R 0% 26°C – 3
A0-300 300° C 3
A0-S-R 26°C CFRP 3
A0-S-300 300°C 3
Group “2” A25 A25-R 25% 26°C – 3
A25-300 300°C 3
A25-S-R 26°C CFRP 3
A25-S-300 300°C 3
Group “3” A50 A50-R 50% 26°C – 3
A50-300 300°C 3
A50-S-R 26°C CFRP 3
A50-S-300 300°C 3
Total no. of specimens 36

Properties of the CFRP sheet and epoxy adhesive

Material A0 mixture A25 mixture A50 mixture
MK 350 350 350
Alkaline solutions NaOH 110.04 110.04 110.04
Na2SiO3 196.98 196.98 196.98
Water 5.74 5.74 5.74
Fine aggregate White sand 419 419 419
Crushed limestone 180 180 180
Coarse aggregate Limestone 1,272 954 636
RAP 0 334.9 669.7

Summary of the test results

Specimen ID Average compressive strength COV Initial stiffness Toughness index
(MPa) Relative variation * (N/mm) Relative variation * % Relative variation *
A0-R 58.20 – 9.69 19562.6 – 1.55 –
A0-300 28.46 -51.1% 12.98 3265.6 -83.3% 1.51 -2.5%
A0-S-R 109.24 +87.7% 4.29 26563.4 +35.8% 1.06 -31.9%
A0-S-300 92.43 +58.8% 1.65 3409.2 -82.6% 1.01 -34.8%
A25-R 35.46 – 7.16 17900.7 – 1.73 –
A25-300 22.61 -36.2% 13.62 2540.9 -85.8% 1.52 -11.7%
A25-S-R 88.50 +149.6% 3.43 16389.2 -8.4% 1.04 -39.9%
A25-S-300 65.79 +85.5% 2.66 2501.5 -86.0% 1.01 -41.3%
A50-R 19.31 – 15.39 13431.9 – 2.00 –
A50-300 18.73 -3.0% 15.27 2019.7 -85.0% 1.86 -7.1%
A50-S-R 90.51 +368.8% 5.90 9028.6 -32.8% 1.03 -48.2%
A50-S-300 49.02 +153.9% 3.06 2152.2 -84.0% 1.02 -49.0%

Chemical analysis of MK (% weight)

Composition SiO2 Fe2O3 Al2O3 Na2O CaO SO3 TiO2 K2O MgO P2O5 Others
Value (%) 50.995 2.114 42.631 0.284 1.287 0.439 1.713 0.337 0.127 0.051 0.022
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