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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2023, Vol. 17 Issue (11) : 1662-1674    https://doi.org/10.1007/s11709-023-0962-1
Mechanical behavior and permeability properties of sustainable and high-performance anisotropic three-dimensional printable concrete
Fatih ÖZALP()
Civil Engineering Department, Istanbul Medeniyet University, Istanbul 34700, Turkey
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Abstract

Three-dimensional printable concrete requires further development owing to the challenges encountered, including its brittle behavior, high cement requirement for the buildability of layers, and anisotropic behavior in different directions. The aim of this study is to overcome these challenges. First, three-dimensional printable concrete mixtures were prepared using silica fume, ground blast furnace slag, and metakaolin, instead of cement, to reduce the amount of cement. Subsequently, the rheological and mechanical behaviors of these concretes were investigated. Second, three-dimensional printable concrete mixtures were prepared using 6-mm-long steel and synthetic fibers to eliminate brittleness and determine the effect of those fibers on the anisotropic behavior of the concrete. As a result of this study, it is understood that printable concretes with extremely low permeability and high buildability can be achieved using mineral additives. In addition, results showed that three-dimensional concrete samples containing short steel fibers achieve fracture energies up to 36 times greater than that of plain concrete. Meanwhile, its characteristic length values, as indicators of ductility, are 22 times higher than those of plain concrete. The weakest strength was recorded at the interfaces between layers. The bending and splitting tensile strengths of three-dimensional printed plain concrete samples were 15% and 19% lower than those of casted samples, respectively. However, the addition of fibers improved the mechanical strength of the interfaces significantly.

Keywords three-dimensional concrete printing      rheology      high performance      mineral additives      anisotropy      fiber     
Corresponding Author(s): Fatih ÖZALP   
Just Accepted Date: 14 November 2023   Online First Date: 10 January 2024    Issue Date: 24 January 2024
 Cite this article:   
Fatih ÖZALP. Mechanical behavior and permeability properties of sustainable and high-performance anisotropic three-dimensional printable concrete[J]. Front. Struct. Civ. Eng., 2023, 17(11): 1662-1674.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0962-1
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I11/1662
sieve size (μm) sand powder (0–0.5 mm) (%) siliceous sand (0.5–1.5 mm) (%)
> 1600 4.6
1000–1600 18.4
710–1000 32.8
500–710 0.2 23.9
355–500 2.2 10.4
250–355 27.5 6.8
180–250 46.8 2.7
125–180 20.1 0.4
63–125 3.1 0.2
0–63 0.1
Tab.1  Sieve analyses of aggregates
item cement GGBS SF MK SPa) SSb)
SiO2 (%) 21.6 40.3 90.05 56.10 98.32 98.15
CaO (%) 65.2 35.7 1.17 0.19 0.35 0.37
SO3 (%) 3.38 0.17 2.53 0.21 0.23
Al2O3 (%) 4.02 12.90 0.32 40.23 0.67 0.65
Fe2O3 (%) 0.25 1.0 0.27 0.85 0.28 0.31
MgO (%) 1.38 6.9 1.37 0.16 0.04 0.03
Na2O (%) 0.95 0.6 0.32 0.24 0.02 0.01
K2O (%) 0.25 1.0 0.28 0.51 0.08 0.05
specific gravity (g/cm3) 3.07 2.86 2.20 2.52 2.60 2.62
specific surface area (cm2/g) 4386 4810 22400 14600
chloride (Cl) 0.0036 0.010 0.0239 0.0091 0.012
activity index, 7 d (%) 50 147
loss on ignition (%) 3.58 0.10 1.98 1.10 0.2 0.2
particle ratio (< 0.045 mm, %) 98.50 98.74 99.3 0.3 0.1
insoluble residue (%) 0.13 0.10
Tab.2  Properties of cement, SF, GGBS, MK, and siliceous aggregates used in current study
materials and usage amounts 3D-REF 3D-GGBS 3D-SF 3D-MK
cement (kg/m3) 800 600 600 600
SF (kg/m3) 200
GGBS (kg/m3) 200
MK (kg/m3) 200
water (kg/m3) 240 240 240 240
sand powder (0–0.5 mm) (kg/m3) 600 595 570 580
sand (0.5–1.5 mm) (kg/m3) 600 595 570 580
superplasticizer (kg/m3) 16.0 12.4 19.6 16.6
water/cement 0.30 0.40 0.40 0.40
water/binder 0.30 0.30 0.30 0.30
unit weight (kg/m3) 2172 2216 2021 2120
Tab.3  Materials used in concrete mixtures
property type of fiber
high strength steel fiber synthetic fiber (polyamide)
length of fiber, L (mm) 6 6.12
diameter of fiber, d (mm) 0.15 0.054
aspect ratio of fiber, L/d 40 113
tensile strength of fiber (N/mm2) 2250 900
specific weight of fiber (g/cm3) 7.85 1.14
Tab.4  Properties of straight steel fibers and polyamide fibers used in current study
test type specimen dimensions (mm) parameters
compression cube h100/h70 f ca) (MPa)
splitting cube h100/ h70 fstb) (MPa)
bending beam 100 × 100 × 500/70 × 70 × 280 GFc) (N/m), fflexd) (MPa)
water permeability disc, beam Ø100, h50/70 × 70 × 280 ke) (mm)
rapid chloride disc Ø100, h50 qf) (C)
Tab.5  Test methods and specimen size (laboratory/printed and casted)
fresh concrete property 3D-REF 3D-GGBS 3D-SF 3D-MK
slump (t = 0) (cm) 19 19 19 19
slump (t = 20 min) (cm) 16 16 15 15
slump (t = 45 min) (cm) 9 12.5 5 6
ambient temperature (°C) 27 24 27 22
concrete temperature (°C) 32.0 28.9 35.2 29.4
unit weight (kg/m3) 2170 2190 2040 2140
pumpability (t = 30 min) good very good not good not good
Tab.6  Fresh concrete test results
Fig.1  Pumpability and buildability zones of printable concrete.
Fig.2  Changes in slump values of the mixtures at the beginning and after 45 min.
Fig.3  Setup of the three-point bending test.
Fig.4  Preparation of 3D printed samples for testing using a diamond saw.
Fig.5  Flexural strength and compressive strength test setups for the measurement of anisotropy in printed concrete.
Fig.6  Permeability test setups of printed samples before they were cut using a diamond saw.
hardened concrete property 3D-REF 3D-GGBS 3D-SF 3D-MK
compressive strength (MPa) 58.8 59.5 65.2 72.3
flexural strength (MPa) 7.18 6.55 7.52 7.86
splitting tensile strength (MPa) 5.11 5.14 5.42 5.47
water absorption (%) 3.99 3.07 2.85 1.94
capillary water absorption (mm) 0.154 0.106 0.083 0.053
rapid chloride ion permeability (C) 3312 674 310 170
Tab.7  Test results of 3D printable concretes with mineral additives
Fig.7  Photographs of flexural tests in different directions prior to cutting using a diamond saw.
fiber-reinforced and plain concretes compressive strength, fc (MPa) splitting tensile strength, fst (MPa) flexural strength, fflex (MPa) fracture energy, GF (N/m) characteristic length, lch (mm) capillary water absorption, k (mm)
3D-REF-NF-C 59.1 5.58 7.03 62 72 0.172
3D-REF-NF-X 55.8 4.53 6.01 64 109 0.206
3D-REF-NF-Y 62.0 5.72 6.30 77 87 0.197
3D-REF-NF-Z 57.0 5.82 6.82 65 68 0.182
3D-PA-C 83.5 6.46 8.28 1143 1176 0.194
3D-PA-X 77.7 5.43 7.49 950 1335 0.227
3D-PA-Y 78.5 6.57 8.95 1171 1130 0.219
3D-PA-Z 79.4 6.51 8.97 1173 1159 0.202
3D-STF-C 93.8 7.95 9.23 2232 1608 0.163
3D-STF-X 86.1 6.50 8.97 1324 1367 0.195
3D-STF-Y 88.4 7.89 9.33 1610 1143 0.182
3D-STF-Z 93.0 7.47 10.16 1606 1304 0.176
Tab.8  Fracture strength and permeability properties of fiber-reinforced and plain concretes
Fig.8  Load vs. displacement curves of tested concrete series.
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