Bond of reinforcement in lightweight concrete

Holschemacher, Klaus; Ali, Ammar Yaser; Iqbal, Shahid

doi:10.1201/9781315641645-210

Cited by 7 publications

(12 citation statements)

References 1 publication

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“…However, higher loading rate (i.e. 0.1 mm/s) yielded higher bond stress and corresponding displacement (Holschemacher et al 2004). Moreover, it was observed that the bond strength of rebar embedded in steel fiber-reinforced UHPC had less brittle pull-out failure and exhibited larger deformations compared to that of similar rebar embedded in UHPC without steel fibers (Maroliya 2012).…”

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

“…Moreover, hooked end or twisted fibers exhibited improved bond strength compared to that of straight fibers due to improved mechanical anchorage . The age of test specimens had minimum effect on the rebar-UHPC initial bond stiffness (Holschemacher et al 2004). However, a significant effect of the specimen age was observed on the maximum bond stress depending on the UHPC mixture design and proportions (Holschemacher et al 2004).…”

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

“…The age of test specimens had minimum effect on the rebar-UHPC initial bond stiffness (Holschemacher et al 2004). However, a significant effect of the specimen age was observed on the maximum bond stress depending on the UHPC mixture design and proportions (Holschemacher et al 2004). The shape of the bond stress-slip curve is highly dependent on the loading rate.…”

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

“…UHPC exhibited high bond strength to rebar and fibers owing to its dense micro-and macro-structures (Chan and Chu 2004;Holschemacher et al 2004) ( Table 9). The steel fibers pull-out behavior from UHPC is highly dependent on the fiber orientation and inclination with respect to the loading direction.…”

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

“…UHPC incorporating steel fibers exhibits higher tensile properties, thus preventing splitting cracks and concrete spalling (Holschemacher et al 2004). Furthermore, the decreased permeability due to the very low porosity of UHPC mitigates the intrusion of aggressive species (e.g.…”

Section: Reinforcement Covermentioning

confidence: 99%

See 4 more Smart Citations

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

321

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In this study, an extensive literature review has been conducted on the material characterization of UHPC and its potential for large-scale field applicability. The successful production of ultra-high performance concrete (UHPC) depends on its material ingredients and mixture proportioning, which leads to denser and relatively more homogenous particle packing. A database was compiled from various research and field studies around the world on the mechanical and durability performance of UHPC. It is shown that UHPC provides a viable and long-term solution for improved sustainable construction owing to its ultrahigh strength properties, improved fatigue behavior and very low porosity, leading to excellent resistance against aggressive environments. The literature review revealed that the curing regimes and fiber dosage are the main factors that control the mechanical and durability properties of UHPC. Currently, the applications of UHPC in construction are very limited due to its higher initial cost, lack of contractor experience and the absence of widely accepted design provisions. However, sustained research progress in producing UHPC using locally available materials under normal curing conditions should reduce its material cost. Current challenges regarding the implementation of UHPC in full-scale structures are highlighted. This study strives to assist engineers, consultants, contractors and other construction industry stakeholders to better understand the unique characteristics and capabilities of UHPC, which should demystify this resilient and sustainable construction material.

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Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

Section: Fiber and Rebar Pull-out (Bond Strength)mentioning

confidence: 99%

Section: Reinforcement Covermentioning

confidence: 99%

See 3 more Smart Citations

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

321

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Unified approach for reinforcement development length using the partly cracked elastic stage for bond strength

Zaborac

Bayrak

2022

Structural Concrete

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Current structural design codes in the United States treat the development of straight bars/lap splices, standard hooks, and deformed headed bars with separate equations. The fib Model Code 2010, on the other hand, uses a more unified approach. Recent changes to the standard hook and headed bar equations in the ACI 318-19 Building Code Requirements for Structural Concrete have sparked conversation about the discrepancies between ACI 318-19 and the AASHTO LRFD Bridge Design Specifications within the bridge design community. The objective of this research was to develop and validate a unified approach for the design/evaluation of reinforcement anchorage. A procedure based on the partly cracked elastic stage of bond was proposed. The proposed procedure was validated with 1006 tests from the literature.

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Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

Shin

Lee

Yoo

2018

Int J Concr Struct Mater

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This study aimed to investigate the bond properties of prestressing strands embedded in ultra-high-performance fiberreinforced concrete (UHPFRC). Toward this end, two types of prestressing strands with diameters of 12.7 and 15.2 mm were considered, along with various concrete cover depths and initial prestressing force magnitudes. The average bond strength of the strands in UHPFRC was estimated by using pullout tests, and the transfer length was evaluated based on a 95% average maximum strain method. Test results indicated that the average bond strength of the pretensioned strand reduced as the diameter of the strand increased, and was between the bond strengths of round and deformed steel rebars. Higher bond strength was also obtained with a lower embedment length. Based on a comparison of p value, the bar diameter and embedment length most significantly influenced the bond strength of strands in UHPFRC, compared to a ratio of cover depth to diameter and initial prestressing force. Pretensioned strands in UHPFRC exhibited much higher bond strength and shorter transfer length compared with strands embedded in ordinary high-strength concrete. Lastly, ACI 318 and AASHTO LRFD codes significantly overestimated the transfer length of the strands embedded in UHPFRC.

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Bond of reinforcement in lightweight concrete

Cited by 7 publications

References 1 publication

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Unified approach for reinforcement development length using the partly cracked elastic stage for bond strength

Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

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