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Development of treated coarse recycled aggregate-based sustainable fibrous high-strength concrete with fine recycled aggregates

M.S. Abo Dhaheer
M.S. Abo Dhaheer
, 
Ali H. Nahhab
Ali H. Nahhab
 et 
Mohammed Salah Nasr
Mohammed Salah Nasr
   | 05 juin 2024
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Publié en ligne: 05 juin 2024
Pages: 1 - 15
Reçu: 11 mars 2024
Accepté: 03 mai 2024
DOI: https://doi.org/10.2478/msp-2024-0014
Mots clés
© 2024 M.S. Abo Dhaheer et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

RAs and steel fibers used
RAs and steel fibers used

Fig. 2.

Treatment procedure of coarse RA
Treatment procedure of coarse RA

Fig. 3.

Densities of the tested concrete mixtures
Densities of the tested concrete mixtures

Fig. 4.

Water absorption of the concrete mixes
Water absorption of the concrete mixes

Fig. 5.

Compressive strength of the tested mixes
Compressive strength of the tested mixes

Fig. 6.

Compressive strength relative to the reference mix (NC+NF-Ref)
Compressive strength relative to the reference mix (NC+NF-Ref)

Fig. 7.

Percentage increase in the mechanical properties (fcu, fst and fr) with the addition of steel fibers (SF)
Percentage increase in the mechanical properties (fcu, fst and fr) with the addition of steel fibers (SF)

Fig. 8.

Splitting tensile strength of the tested mixes
Splitting tensile strength of the tested mixes

Fig. 9.

Splitting tensile strength relative to the reference mix (NC+NF-Ref)
Splitting tensile strength relative to the reference mix (NC+NF-Ref)

Fig. 10.

Flexural strength of the tested mixes
Flexural strength of the tested mixes

Fig. 11.

Flexural strength relative to the reference mix (NC+NF-Ref)
Flexural strength relative to the reference mix (NC+NF-Ref)

Fig. 12.

Ultrasonic pulse velocity test
Ultrasonic pulse velocity test

Fig. 13.

UPV results of the concrete mixtures
UPV results of the concrete mixtures

Sieve analysis of the used coarse aggregates

Sieve size mm % Cumulative passing Limits of IQS No.45 [36]
NC RC
37.5 100 100 100
20 98 95 95–100
14 66 60 —
10 37 32 30–60
5 1 2 0-10

Sieve analysis of the used fine aggregates

Sieve size mm % Cumulative passing Limits of IQS No.45 [36]
NFA RFA
10 100 100 100
4.75 95 98 90–100
2.36 86 91 75–100
1.18 75 77 55–90
0.6 54 59 35–59
0.3 19 26 8–30
0.15 3 6 0–10

Designation of the tested mixes

Mix details Mix details
NC+NF-Ref Natural coarse aggregates + Natural fine aggregates-Reference mix
NC+RF* Natural coarse aggregates + Recycled fine aggregates
RC**+NF Recycled coarse aggregates+ Natural fine aggregates
TRC+NF Treated recycled coarse aggregates + Natural fine aggregates
RC+RF Recycled coarse aggregates + Recycled fine aggregates
TRC+RF Treated recycled coarse aggregates + Recycled fine aggregates
NC+RF0.5F Natural coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers
RC+NF0.5F Recycled coarse aggregates + Natural fine aggregates + 0.5% Steel fibers
TRC+NF0.5F Treated recycled coarse aggregates + Natural fine aggregates + 0.5% Steel fibers
RC+RF0.5F Recycled coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers
TRC+RF0.5F Treated recycled coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers

Mix ingredients (kg/m3) of the prepared mixes

Mix designation C W SP NF RF NC RC SF
NC+NF-Ref 498 160 5.5 704 0 1060 0 0
NC+RF 498 160 6.4 0 572 1060 0 0
RC+NF 498 160 5.8 704 0 0 915 0
TRC+NF 498 160 6.1 704 0 0 960 0
RC+RF 498 160 7.0 0 572 0 915 0
TRC+RF 498 160 7.4 0 572 0 960 0
NC+RF0.5F 498 160 8.5 0 572 1046 0 39
RC+NF0.5F 498 160 8.0 704 0 0 903 39
TRC+NF0.5F 498 160 8.6 704 0 0 948 39
RC+RF0.5F 498 160 9.3 0 572 0 903 39
TRC+RF0.5F 498 160 9.7 0 572 0 948 39

Chemical and physical test results of cement

Chemical tests
Oxides Test results Limits of IQS No.5 [37]
SiO2% 23.78 —
Al2O3% 3.120 —
Fe2O3% 3.09 —
CaO% 62.07 —
MgO% 2.25 ≤5%
SO3% 1.032 ≤2.8% if
C3A > 5%
≤2.5% if
C3A < 5%
Insoluble residue% 0.81 ≤1.5%
Loss on Ignition% 1.17 ≤4%
L.S.F 0.82 0.66 – 1.02
Main compounds
C2S% 36.548 —
C3S% 41.927 —
C3A% 3.040 —
C4AF% 9.403 —
Physical tests
Setting time, min.,
initial 73 ≥45 min.
final 5:50 ≤10 hr.
Fineness (Blaine), cm2/g 2984 ≥2500
Compressive strength, MPa,
2 days 17.1 ≥10
28 days 38.6 ≥32.5
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Langue:
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Materials Sciences, other, Nanomaterials, Functional and Smart Materials, Materials Characterization and Properties
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