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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2024, Vol. 18 Issue (11) : 1713-1729    https://doi.org/10.1007/s11709-024-1115-x
Evaluating the usability of recycled aggregates as fill materials depending on the composition and strength of their grains
Bahadir OK(), Huseyin COLAKOGLU
Department of Civil Engineering, Adana Alparslan Turkes Science and Technology University, Adana 01250, Turkey
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Abstract

While recycling is a topic of contemporary relevance, there is a scarcity of research on the engineering characteristics of construction and demolition wastes with different levels of grain strength and composition of debris, which impose constraints on their potential for reuse. This study aims to increase the use of recycled aggregates in fillings, addressing a gap in the literature. For this purpose, large-scale direct shear and California bearing ratio tests were conducted on nine diverse recycled aggregates from different construction works. The test outcomes were compared to those obtained from natural aggregates (NA) to draw a meaningful conclusion. The impact of the specimens’ water content and relative density on the findings was discussed. Results demonstrated that the shear strength of recycled aggregates is significantly affected by the compressive strength of the concrete within the recycled aggregates. Besides, increasing the percentage of NA or relative density improved the specimen’s shear strength. On the other hand, it was determined that the high water content of the crushed bricks reduced the fill’s quality. As a result of the study, equations were suggested for use in filling design.

Keywords recycled aggregates      fillings      sustainability      granular soils      large-scale direct shear test     
Corresponding Author(s): Bahadir OK   
Just Accepted Date: 09 July 2024   Online First Date: 23 September 2024    Issue Date: 28 November 2024
 Cite this article:   
Bahadir OK,Huseyin COLAKOGLU. Evaluating the usability of recycled aggregates as fill materials depending on the composition and strength of their grains[J]. Front. Struct. Civ. Eng., 2024, 18(11): 1713-1729.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-024-1115-x
https://academic.hep.com.cn/fsce/EN/Y2024/V18/I11/1713
Fig.1  Waste recycling process.
Component Unit CDW1 CDW2
Concrete, concrete products, mortar (Rc) % 61.60 28.96
Aggregate, aggregate without binder, aggregate with hydraulic binder (Ru) % 29.57 63.06
Brick, wall units with calcium silicate (Rb) % 8.79 7.94
Glass (Rg) % 0.01
Other materials (metals, non-floating wood plastic, rubber, plaster) (X) % 0.03 0.03
Tab.1  The percentages of the recycled aggregates in the CDWs
Fig.2  The CDW1, the CDW2, and the CB, respectively.
Fig.3  The RCAs.
Fig.4  The NA.
Property CDW1 CDW2 CB RCA45 RCA40 RCA35 RCA30 RCA25 ICP19 NA
Cu 19.17 15.91 12.00 9.32 10.94 14.76 9.12 11.53 14.00 14.40
Cc 1.23 1.05 1.15 1.22 1.30 1.24 1.48 1.26 1.41 1.65
FI (%) 10.40 9.86 26.29 14.16 14.20 14.29 14.28 14.39 10.49 9.87
LA (%) 38.6 30.0 26.9 35.9 36.0 36.6 38.2 38.7 41.8 28.3
γs (kN/m3) Fine 26.58 26.54 27.27 26.17 25.98 26.22 26.13 26.23 26.60 26.60
γs (kN/m3) Coarse 25.76 26.41 26.47 26.11 26.11 26.10 26.09 26.10 25.89 26.58
WA (%) Fine 11.37 11.34 20.24 8.39 10.52 9.29 9.10 10.99 6.85 3.31
WA (%) Coarse 7.69 4.53 16.71 4.94 5.47 5.27 5.38 5.77 5.12 0.83
γdrymax (kN/m3) 17.90 19.30 15.42 19.06 18.51 18.75 18.60 18.68 17.95 21.24
ωopt (%) 12.00 11.25 21.15 10.65 11.95 10.80 10.95 11.86 12.90 7.3
γDr=95% (kN/m3) 18.45 20.29 14.51 19.23 19.36 19.19 19.05 18.49 17.66 21.48
γDr=35% (kN/m3) 16.59 18.50 12.92 17.47 17.08 17.10 16.79 16.66 15.69 19.78
Tab.2  The geotechnical/engineering properties
Fig.5  The gradations.
Fig.6  The failure mechanisms of fillings.
Fig.7  The LSDS test device.
The type of recycled aggregate Dry specimens Wet specimens
Seri I (Dr = 35%) Seri II (Dr = 95%) Seri III (ωopt)
ω (%) γd (kN/m3) ω (%) γd (kN/m3) ω (%) γd (kN/m3)
CDW1 16.59 18.45 12.00 17.90
CDW2 18.50 20.29 11.25 19.30
CB 12.92 14.51 21.15 15.42
RCA45 17.47 19.23 10.65 19.06
RCA40 17.08 19.36 11.95 18.51
RCA35 17.10 19.19 10.80 18.75
RCA30 16.79 19.05 10.95 18.60
RCA25 16.66 18.49 11.86 18.68
ICP19 15.69 17.66 12.90 17.95
NA 19.78 21.48 7.30 21.24
Tab.3  The LSDS test conditions
The type of recycled aggregate φ (° )
Dr = 35% Dr = 95%
CDW1 54.63 59.04
CDW2 54.87 60.09
CB 54.95 61.06
RCA45 56.56 63.61
ICP19 55.38 61.72
Tab.4  The internal friction angles of the recycled aggregates in the different relative densities
Fig.8  The (a) τε curves and the (b) shear strength envelopes for different relative densities.
The type of recycled aggregate φ (° ) CBR (%)
CDW1 56.18 74.97
CDW2 60.02 80.06
CB 57.81 60.04
RCA45 60.99 91.59
ICP19 59.03 76.02
Tab.5  The parameters of the recycled aggregates at the optimum water contents
Fig.9  The (a) τε curves and the (b) shear strength envelopes for the optimum water content.
Type of RCA φ (° ) CBR (%)
Dry specimens Wet specimens Wet specimens
Dr = 35% Dr = 95% ωopt (Dr = 75%–85%) ωopt (Dr = 75%–85%)
RCA45 56.56 63.61 60.99 91.59
RCA40 56.27 63.30 60.30 89.78
RCA35 56.00 63.03 60.12 84.71
RCA30 55.60 62.03 59.94 77.04
RCA25 55.70 61.83 59.65 76.49
ICP19 55.38 61.72 59.03 76.02
Tab.6  The results of the LSDS and the CBR tests
Fig.10  The shear envelopes of the RCA45 and the ICP19 in different conditions.
Fig.11  The changing of (a) ? and (b) CBR with concrete’s compressive strength.
Fig.12  The changing of LA with concrete’s compressive strength.
Fig.13  The (a) ? and (b) CBR values depending on the NA content.
Fig.14  The ? values for different cases.
Fig.15  The design flowchart for the recycled aggregates.
Fig.16  The CBR values for different cases.
Variable Condition Normalized sensitivity index Rank
(CDW)NA Dr = 95%, ω = 0 0.0430 1
(RCA)MPa Dr = 95%, ω = 0 0.0403 2
(CDW)NA Dr = 75%–85%, ωopt 0.0364 3
(RCA)MPa Dr = 75%–85%, ωopt 0.0336 4
(CDW)NA Dr = 35%, ω = 0 0.0243 5
(RCA)MPa Dr = 35%, ω = 0 0.0242 6
Tab.7  The results of the LSDS and the CBR tests
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