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

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

Materials Science-Poland
Volume 42 (2024): Issue 2 (June 2024)
By: ,   and    
Open Access
|Jun 2024
Figures & tables

Figures & Tables

Fig. 1.

RAs and steel fibers used

Table 1.

Sieve analysis of the used fine aggregates

Sieve size mm% Cumulative passingLimits of IQS No.45 [36]
NFARFA
10100100100
4.75959890–100
2.36869175–100
1.18757755–90
0.6545935–59
0.319268–30
0.15360–10
Table 2.

Sieve analysis of the used coarse aggregates

Sieve size mm% Cumulative passingLimits of IQS No.45 [36]
NCRC
37.5100100100
20989595–100
146660—
10373230–60
5120-10
Table 3.

Chemical and physical test results of cement

Chemical tests
OxidesTest resultsLimits 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.F0.820.66 – 1.02
Main compounds
C2S%36.548—
C3S%41.927—
C3A%3.040—
C4AF%9.403—
Physical tests
Setting time, min.,
initial73≥45 min.
final5:50≤10 hr.
Fineness (Blaine), cm2/g2984≥2500
Compressive strength, MPa,
2 days17.1≥10
28 days38.6≥32.5
Fig. 2.

Treatment procedure of coarse RA

Table 4.

Designation of the tested mixes

Mix detailsMix details
NC+NF-RefNatural coarse aggregates + Natural fine aggregates-Reference mix
NC+RF*Natural coarse aggregates + Recycled fine aggregates
RC**+NFRecycled coarse aggregates+ Natural fine aggregates
TRC+NFTreated recycled coarse aggregates + Natural fine aggregates
RC+RFRecycled coarse aggregates + Recycled fine aggregates
TRC+RFTreated recycled coarse aggregates + Recycled fine aggregates
NC+RF0.5FNatural coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers
RC+NF0.5FRecycled coarse aggregates + Natural fine aggregates + 0.5% Steel fibers
TRC+NF0.5FTreated recycled coarse aggregates + Natural fine aggregates + 0.5% Steel fibers
RC+RF0.5FRecycled coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers
TRC+RF0.5FTreated recycled coarse aggregates + Recycled fine aggregates + 0.5% Steel fibers

1* For the above mixes, the replacement levels of fine and/or coarse RA are 100%.

Table 5.

Mix ingredients (kg/m3) of the prepared mixes

Mix designationCWSPNFRFNCRCSF
NC+NF-Ref4981605.57040106000
NC+RF4981606.40572106000
RC+NF4981605.8704009150
TRC+NF4981606.1704009600
RC+RF4981607.0057209150
TRC+RF4981607.4057209600
NC+RF0.5F4981608.505721046039
RC+NF0.5F4981608.07040090339
TRC+NF0.5F4981608.67040094839
RC+RF0.5F4981609.30572090339
TRC+RF0.5F4981609.70572094839

1 C, W, SP, NF, RF, NC, RC, and SF refer, respectively, to the used cement, water, super-plasticizers, natural fine aggregates, recycled fine aggregates, natural coarse aggregates, recycled coarse aggregates, and steel fibers.

Fig. 3.

Densities of the tested concrete mixtures

Fig. 4.

Water absorption of the concrete mixes

Fig. 5.

Compressive strength of the tested mixes

Fig. 6.

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)

Fig. 8.

Splitting tensile strength of the tested mixes

Fig. 9.

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

Fig. 10.

Flexural strength of the tested mixes

Fig. 11.

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

Fig. 12.

Ultrasonic pulse velocity test

Fig. 13.

UPV results of the concrete mixtures

DOI: https://doi.org/10.2478/msp-2024-0014 | Journal eISSN: 2083-134X (formerly 2083-124X) | Journal ISSN: 2083-1331
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Language: English
Page range: 1 - 15
Submitted on: Mar 11, 2024
Accepted on: May 3, 2024
Published on: Jun 5, 2024
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Keywords:
High-strength concrete,
recycled concrete aggregate,
aggregate treatment,
steel fibers,
recycling
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2024 M.S. Abo Dhaheer, Ali H. Nahhab, Mohammed Salah Nasr, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 42 (2024): Issue 2 (June 2024)
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