Experimental and analytical investigations on the behavior of interface between concrete and polymer cement mortar under hygrothermal conditions

Rashid, Khuram; Ueda, Tamon; Zhang, Dawei; Miyaguchi, Katsushi; Nakai, Hiroshi

doi:10.1016/j.conbuildmat.2015.07.035

Cited by 73 publications

(38 citation statements)

References 30 publications

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“…Elevated temperatures decrease the interaction of the physical bonding of cementitious material with steel. More slippage was observed at a high temperature in previous studies, which may be due to a significant reduction in PCM mechanical properties (Rashid et al 2015d). Various codes give the prediction formula for crack width as a function of flexural crack spacing ((CEN) 2004, (JSCE) 2007), which was considered to be the main reason for increasing crack width with increasing temperature.…”

Section: (C) and (D)mentioning

confidence: 99%

“…The averages of three specimens were used to evaluate the strength at each temperature. The details of the setup and the results of the tests are presented in another paper that focused on the PCM-concrete interface bond properties (Rashid et al 2015d). All beams were tested in four-point bending with a constant shear span of 460 mm.…”

Section: Testing and Exposure Conditionsmentioning

confidence: 99%

“…In practice, many RC structures are exposed to large daily temperature fluctuations, with maximum temperatures reaching 60 ℃ in peak summer, especially in the Middle East and some parts of North America (Al-Jabri et al 2005). It has been reported that high temperature degrades the mechanical properties of concrete, PCM and PCM-concrete bonds and thus may affect the overall behavior of PCM overlaid RC members (Rashid et al 2015a, Rashid et al 2014, 2015b, Rashid et al 2015d.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Analytical Investigation of Crack Spacing and Width for Overlaid RC Beams at Elevated Temperatures

et al. 2017

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Section: (C) and (D)mentioning

confidence: 99%

Section: Testing and Exposure Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Analytical Investigation of Crack Spacing and Width for Overlaid RC Beams at Elevated Temperatures

et al. 2017

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“…It may be used to enhance the interfacial strengths of old to new concrete or in the repairing, strengthening or rehabilitation of concrete structures. The influence of adhesive strength has a significant effect on the strengthening of concrete structures …”

Section: Literature Reviewmentioning

confidence: 99%

“…The influence of adhesive strength has a significant effect on the strengthening of concrete structures. 15,16 Fibers are also used to enhance the shear strength of concrete and may result in the full or partial replacement of stirrups. Several investigations were conducted by incorporating different types of fibers, and improvement in shear capacity is reported.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Rashid

Balouch²

2017

Structural Concrete

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The accumulation of worn‐out tires creates health and fire hazards, and researchers are busy to incorporate waste tire rubber in concrete instead of burning or dumping. After shredding of waste tires, steel beads were separated by magnetic separator. The potential utilization of wasted steel fibers in concrete was investigated in this experimental work; fresh and hardened properties of fiber‐reinforced concrete (RC) were evaluated and compared with the conventional concrete. Shear behavior was investigated by conducting a four‐point bending test on RC beams. Five types of RC beams were cast; two control specimens were cast, with and without stirrups, by using conventional concrete. Three types of beams were cast by using 0.40, 0.65, and 1.00% fibers by volume. Workability of fiber RC was lower than the conventional concrete. Linear increase in failure load was observed with an increase in the dosage of fibers, and a 64.3% increase in failure load was observed after 1% addition as compared to control specimen. Mid‐span deflection, crack initiation load, and ultimate shear load were also increased with the addition of fibers. Crack spacing was reduced by 64.2% of specimen, with 1% dosage of fibers as compared to a control specimen without any stirrups, and a reduction in crack width was also observed with the addition of fibers.

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Effects of styrene–acrylic emulsion on bond performance and interface microstructure of repair mortar of ternary cementitious system

Shi,

Bu,

2024

J of Applied Polymer Sci

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This study investigates the effects of styrene–acrylic emulsion (SAE) as a modifier and interfacial agent on the interfacial bond performance of ordinary Portland cement–aluminate cement–gypsum (PAG) repair mortar. The hydration products and interfacial microstructure are analyzed via x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), Fourier‐transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). The results demonstrate that the addition of SAE can effectively enhance the tensile bond strength and flexural bond strength of the PAG repair mortar, and the optimal addition amount of SAE is 10 wt%. The tensile and flexural bond strengths of the PAG repair mortar with SAE interfacial agent at 40% concentration are 1.38 and 1.34 times than those of the mortar without the interfacial agent, respectively. XPS and FTIR analyses reveal that the carboxyl groups in SAE and Ca2+ generated from cement hydration form Ca2+–carboxyl complexes. The SEM and XRD analyses indicate that SAE can alter the distribution and size of crystals at the bond interface and considerably reduce the thickness of the bond interface; however, SAE cannot change the type of hydration products at the bond interface.

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Experimental and analytical investigations on the behavior of interface between concrete and polymer cement mortar under hygrothermal conditions

Cited by 73 publications

References 30 publications

Experimental and Analytical Investigation of Crack Spacing and Width for Overlaid RC Beams at Elevated Temperatures

Experimental and Analytical Investigation of Crack Spacing and Width for Overlaid RC Beams at Elevated Temperatures

Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Effects of styrene–acrylic emulsion on bond performance and interface microstructure of repair mortar of ternary cementitious system

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