Flexural behavior of ECC hollow beams incorporating different synthetic fibers

doi:10.1007/s11709-021-0701-4

Front. Struct. Civ. Eng.

2021, Vol. 15

Issue (2) : 399-411 https://doi.org/10.1007/s11709-021-0701-4

RESEARCH ARTICLE

Flexural behavior of ECC hollow beams incorporating different synthetic fibers

Ahmmad A. ABBAS^1,², Farid H. ARNA ’OT³, Sallal R. ABID⁴(

), Mustafa ÖZAKÇA¹

¹. Civil Engineering Department, Gaziantep University, Gaziantep 72310, Turkey
². Building and Construction Materials Department, Southern Technical University-Shatrah Technical Institute, Shatrah 64007, Iraq
³. College of Technical Engineering, Islamic University in An Najaf, Najaf 54001, Iraq
⁴. Civil Engineering Department, Wasit University, Kut 52001, Iraq

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Abstract

Twelve ECC beams with three different fiber types, along with four normal concrete beams, were tested in this study to evaluate the influence of cross-sectional hollowing on their flexural performance. The fiber types used were nylon monofilament (NM), low-cost untreated polyvinyl alcohol (PVA), and polypropylene (PP). Three different square hole sizes of 60, 80, and 100 mm with cross-sectional hollowing ratios of 0.16, 0.28, and 0.44, respectively, were adopted for each group of beams in addition to a solid beam. All beams were tested under four-point loading using a displacement-controlled testing machine. The test results showed that ECC beams can mostly withstand higher cracking and ultimate loads compared to their corresponding normal concrete versions. The results also showed that both the ductility and toughness of the ECC beams are higher than those of the normal concrete beams and that the ductility values of the hollow beams with a hole size of 60 mm are higher than those of the corresponding solid beams. Moreover, hollow ECC beams with hole sizes of 60 and 80 mm exhibited a higher ductility than a solid normal concrete beam.

Keywords hollow beam hollowing ratio ECC flexural strength ductility toughness

Corresponding Author(s): Sallal R. ABID

Just Accepted Date: 03 March 2021 Online First Date: 22 April 2021 Issue Date: 27 May 2021

Cite this article:

Ahmmad A. ABBAS,Farid H. ARNA ’OT,Sallal R. ABID, et al. Flexural behavior of ECC hollow beams incorporating different synthetic fibers[J]. Front. Struct. Civ. Eng., 2021, 15(2): 399-411.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-021-0701-4
https://academic.hep.com.cn/fsce/EN/Y2021/V15/I2/399

Tab.1 Fiber properties

Tab.2 Proportions of ECC and normal concrete mixtures

Tab.3 Compressive strength, splitting tensile strength, and modulus of elasticity of the four mixtures

Fig.1 Configuration and reinforcement details of the tested solid and hollow beams.

Fig.2 The beam test setup under four-point loading.

mix	f₁(MPa)	f_p(MPa)	f₁/ f_p	$T 150 D$ (J)	? $T 150 D, F T 150 D, 0$	$R T, 150 D$ (%)	$R T, 150 D, F R T, 150 D, 0$
normal	4.97	4.97	1.00	3381.30	1.00	14	1.00
NM-ECC	3.24	4.75	0.68	15500.83	4.58	106	7.6
PVA-ECC	4.87	5.03	0.97	14463.12	4.28	46	3.3
PP-ECC	3.29	5.08	0.65	21078.60	6.23	78	5.6

Tab.4 Main flexural performance indices

Fig.3 Load-deflection curves of prisms tested according to ASTM C1609.

Tab.5 Load and deflection results of the tested beams

Fig.4 Effect of increasing the hole index (HI) on (a) the cracking load and (b) service load according to Euro code 2.

Fig.5 Effect of increasing the HI on the ultimate beam strength.

Fig.6 Ultimate load of normal concrete beams and ECC beams of different fibers.

Fig.7 Load-deflection curves for (a) solid beams, (b) beams with 60 mm holes, (c) beams with 80 mm holes, and (d) beams with 100 mm holes.

Fig.8 Load-deflection curves for (a) normal concrete, (b) PVA-ECC, (c) NM-ECC, and (d) PP-ECC beams.

Fig.9 Ductility parameters for the experimental beam PP6.

Fig.10 Effect of hole index on the beam ductility.

Fig.11 Toughness of the tested beams.

Fig.12 Crack pattern of the tested beams for (a) normal concrete, (b) PVA-ECC, (c) NM-ECC, and (d) PP-ECC beams.

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