Feasibility of Reduced Lap-Spliced Length in Polyethylene Fiber-Reinforced Strain-Hardening Cementitious Composite

This research investigates the interfacial behavior between polyethylene (PE) fiber-reinforced strain-hardening cement composite (PE-SHCC) and reinforcing bars that are spliced in the tension region to determine feasibility of reduced lap-spliced length in PE-SHCC. Twenty test specimens were subjected to monotonic and cyclic tension loads. The variables include the replacement levels of an expansive admixture (0% and 10%), the compressive strength of the SHCC mixtures (40 MPa and 80 MPa), and the lap-spliced length in the tension region (40% and 60% of the splice length recommended by ACI 318). The PE-SHCC mixture contains polyethylene fiber to enhance the tensile strength, control the widths of the cracks, and increase the bond strength of the lap splice reinforcement and the calcium sulfo-aluminate- (CSA-) based expansive admixture to improve the tension-related performance in the lap splice zone. The results have led to the conclusion that SHCC mixtures can be used effectively to reduce the development length of lap splice reinforcement up to 60% of the splice length that is recommended by ACI 318. The addition of the calcium sulfo-aluminate-based expansive admixture in the SHCC mixtures improved the initial performance and mitigated the cracking behavior in the lap splice region.

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Bond and cracking behavior of lap-spliced reinforcing bars embedded in hybrid fiber reinforced strain-hardening cementitious composite (SHCC)

Composites Part B Engineering ◽

10.1016/j.compositesb.2016.09.086 ◽

2017 ◽

Vol 108 ◽

pp. 35-44 ◽

Cited By ~ 27

Author(s):

Won-Chang Choi ◽

Seok-Joon Jang ◽

Hyun-Do Yun

Keyword(s):

Strain Hardening ◽

Cementitious Composite ◽

Fiber Reinforced ◽

Reinforcing Bars ◽

Hybrid Fiber ◽

Cracking Behavior

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Temperature effects on the bond behavior between deformed steel reinforcing bars and hybrid fiber-reinforced strain-hardening cementitious composite

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.117337 ◽

2020 ◽

Vol 233 ◽

pp. 117337 ◽

Cited By ~ 5

Author(s):

Alok A. Deshpande ◽

Dhanendra Kumar ◽

Ravi Ranade

Keyword(s):

Strain Hardening ◽

Temperature Effects ◽

Cementitious Composite ◽

Fiber Reinforced ◽

Reinforcing Bars ◽

Hybrid Fiber ◽

Bond Behavior

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Influence of Shrinkage Compensation in Cement Matrix on the Tension Stiffening of Reinforced Strain-Hardening Cement Composite (SHCC) Tension Ties

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.3660 ◽

2012 ◽

Vol 204-208 ◽

pp. 3660-3663

Author(s):

Hyun Do Yun ◽

Su Chang Wang ◽

Chang Gun Cho

Keyword(s):

Strain Hardening ◽

Shrinkage Strain ◽

Cement Composite ◽

Cement Matrix ◽

Tension Stiffening ◽

Cracking Behavior ◽

Rich Mixture ◽

Cyclic Tension ◽

Shrinkage Compensation ◽

Deformed Bar

This paper investigates the interaction of structural deformed bar reinforcement and strain hardening cement composite (SHCC). The SHCC shows excellent mechanical properties such as multiple cracks and strain-hardening. Generally, SHCC material consists of cement, silica sand and fibers and is rich mixture without aggregate. Rich mixture leads to much shrinkage strain of SHCC material. In this research, the replacement of a part of cement by expansive admixture (EXA) is considered as an alternative to compensate the shrinkage strain of SHCC material. This paper presents the experimental results of tests on tension stiffening and cracking behavior of reinforced conventional and shrinkage-compensating SHCC ties in monotonic and cyclic tension. Each tie specimen had a square cross-section dimension of 100 x 100mm and length of 1,500mm. A 16mm diameter deformed bar was embedded centrally and mixed with 1.5% hybrid fibers composed of Polyethylene(PE) and Steel core(SC). The test results indicated that the shrinkage compensation of cement matrix in SHCC improve the tension stiffening and cracking behavior of reinforced SHCC ties in monotonic and cyclic tension loading.

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Damage Tolerance of Reinforced Concrete (RC) Beams with a Layer of PE Fiber Reinforced Strain-Hardening Cement Composite (PE-SHCC)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.372.219 ◽

2013 ◽

Vol 372 ◽

pp. 219-222

Author(s):

Yeon Jun Yun ◽

Seok Joon Jang ◽

Hyun Do Yun

Keyword(s):

Reinforced Concrete ◽

Strain Hardening ◽

Volume Fraction ◽

Cement Composite ◽

Rc Beam ◽

Rc Beams ◽

Fiber Reinforced ◽

Cracking Behavior ◽

Flexural Performance ◽

Strength And Ductility

This work evaluated the applicability of polyethylene (PE) fiber reinforced strain-hardening cement composite (PE-SHCC) layer at the bottom of reinforced concrete (RC) beams to improve the flexural performance and cracking behavior. PE-SHCC material with specific compressive strength of 70MPa was reinforced with 1.5% PE fibers at the volume fraction. Four RC beams with cross-section of 130 x 170mm and length of 1,460mm were made and tested under four-point monotonic loading. Three beams were layered with PE-SHCC material and one whole RC beam was a control specimen for comparison. Principal variable is the thickness of PE-SHCC layer; 20, 40 and 60mm that are equivalent to 11, 23 and 35% of beams depth. Experimental results indicated that the addition of PE-SHCC layer enhanced the crack-damage mitigation of RC beams and improve the structural behavior, such as strength and ductility, of RC beams.

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Tension Stiffening and Cracking Behavior of Ultra High Strength Strain-Hardening Cement Composite (UHS-SHCC) Ties in Monotonic and Cyclic Tension

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.3982 ◽

2012 ◽

Vol 204-208 ◽

pp. 3982-3985

Author(s):

Young Jae Song ◽

Hyun Do Yun

Keyword(s):

Strain Hardening ◽

High Strength ◽

High Volume ◽

Cement Composite ◽

Initial Crack ◽

Conventional Concrete ◽

Tension Stiffening ◽

Cracking Behavior ◽

Cyclic Tension ◽

Reinforced Cement

This study investigates the tensile response of reinforced ultra high strength strain- hardening cement composite (UHS-SHCC) ties in directly monotonic and cyclic tension. The UHS-SHCC exhibits valuable material properties such as high compressive strength, tensile strain-hardening and ductility. However, UHS-SHCC requires high volume of cement, which leads to more shrinkage than conventional concrete. Authors have considered replacing a part of cement by the expansive admixture (EXA) for compensating the shrinkage of UHS-SHCC. Specifically, this paper explores the structural application of a shrinkage-compensating UHS-SHCC to improve tension stiffening in structural members. The cement composite type and EXA replacement were taken as experimental parameters. All specimens had a square cross-section dimension of 100 x 100mm and length of 1,500mm. The test results indicate that the shrinkage compensating UHS-SHCC is very effective to improve tension stiffening behavior and initial crack load of reinforced cement composite ties.

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