Flexural performance of reinforced Alkali-activated concrete beams incorporating steel and structural Macro synthetic polypropylene fiber

Hammad, Nancy; El-Nemr, Amr; Hassan, Hossam El-Deen

doi:10.1016/j.conbuildmat.2022.126634

Cited by 20 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, beams made of plain concrete (F01, F02, F03, and F04) exhibited explosive concrete crushing, whereas fibre-reinforced beams with 0.25 and 0.5 percent fibres exhibited relatively ductile behavior, with the beams reaching the failure stage progressively. Previously conducted research (Shaaban et al, 2021;Hammad et al, 2022;Al Marahla et al, 2023) examined the flexural and cracking behaviour of reinforced concrete beams containing fibers. According to the authors, the addition of polypropylene fibres increased flexural fractures by up to 30% and increased stiffness.…”

Section: Resultsmentioning

confidence: 99%

Finite Element Modelling of Polypropylene Fibre Reinforced Concrete Beams Reinforced with Steel under Bending

AL-MARAHLA,

SHEHZAD,

ALMARAHLLEH

2023

EPSTEM

View full text Add to dashboard Cite

Application of the fibre-reinforced concrete has manifested a wider acceptability over time for its contribution towards significantly improving the flexural performance of structural members. A lot of work has been done to understand the influence of fibres on the mechanical and structural behaviour of reinforced concrete. Towards this end, several researchers have experimentally investigated the residual flexural strength to characterize the fibre-reinforced concrete. The number of influencing parameters to be investigated through experiments is mostly limited because of the time and cost implications. Consequently, validation of the experimental investigations through analytical models and further utilizing these models to study the behaviour in greater detail is a viable option for researchers. As part of this work, an analytical investigation has been performed to investigate the performance of full-scale polypropylene fibre-reinforced concrete beams. The models have been validated through comparison with the observed performance during an experimental investigation where tests on twelve full-scale FRC beams were performed. Three-dimensional finite element models of the beams under 4-point loading were prepared and the post-cracking flexural performance of FRC beams has been investigated by varying the dosage of polypropylene fibres obtained from shredding medical face masks.

show abstract

Section: Resultsmentioning

confidence: 99%

Finite Element Modelling of Polypropylene Fibre Reinforced Concrete Beams Reinforced with Steel under Bending

AL-MARAHLA,

SHEHZAD,

ALMARAHLLEH

2023

EPSTEM

View full text Add to dashboard Cite

show abstract

“…Enhances the flexural and compressive strengths Reduces shrinkage [13,16,38] Curing conditions Elevated temperature curing Decreases the shrinkage of AAS systems [26] As is clear from Table 1, the alkaline activator was evaluated by many studies on the shrinkage and mechanical properties of AAS. Two factors appeared to affect the alkaline activator: type and concentration.…”

Section: Fiber Reinforcementmentioning

confidence: 99%

“…This technology has a clear influence on reducing carbon dioxide emissions and innovating a sustainable environmentally friendly infrastructure. AAS has demonstrated unconventionally superior compressive strength and appropriate resistance to high temperature and chemical attack [ 16 ]. Nevertheless, many types of research have reported many limitations on using AAS in full-scale applications, including its higher drying shrinkage and early-age cracking compared to OPC concrete which threaten structural integrity, serviceability, and safety.…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Report: The Self-Healing Capability of Alkali-Activated Slag (AAS) Concrete

2023

Self Cite

View full text Add to dashboard Cite

Alkali-activated slag (AAS) has emerged as a potentially sustainable alternative to ordinary Portland cement (OPC) in various applications since OPC production contributed about 12% of global CO2 emissions in 2020. AAS offers great ecological advantages over OPC at some levels such as the utilization of industrial by-products and overcoming the issue of disposal, low energy consumption, and low greenhouse gas emission. Apart from these environmental benefits, the novel binder has shown enhanced resistance to high temperatures and chemical attacks. However, many studies have mentioned the risk of its considerably higher drying shrinkage and early-age cracking compared to OPC concrete. Despite the abundant research on the self-healing mechanism of OPC, limited work has been devoted to studying the self-healing behavior of AAS. Self-healing AAS is a revolutionary product that provides the solution for these drawbacks. This study is a critical review of the self-healing ability of AAS and its effect on the mechanical properties of AAS mortars. Several self-healing approaches, applications, and challenges of each mechanism are taken into account and compared regarding their impacts.

show abstract

“…In addition, they are characterized by their distinguished performance in terms of mechanical and durability properties [6,7]. Extensive research [8][9][10] has been devoted to investigating these sustainable materials. However, a high shrinkage rate is reported in multiple studies as one of the obstacles that hinders the full application of alkali-activated composites.…”

Section: Introductionmentioning

confidence: 99%

The Efficiency of Calcium Oxide on Microbial Self-Healing Activity in Alkali-Activated Slag (AAS)

Hammad,

El-Nemr,

Shaaban

2024

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Alkali-activated slag (AAS) materials are one of the most promising sustainable construction composites. These novel materials are highly characterized by their improved mechanical and durability properties. Nevertheless, the high shrinkage rate hinders their full-scale applications. The low Ca/Si ratio, complex hydration process, and fine pore microstructure are the main causes of the reported shrinkage behavior. This study introduces Bacillus subtilis culture for healing the cracking behavior. The enzymatic action leads to precipitating calcium carbonate crystals that fill AAS cracks and pores. Incorporating calcium oxide has been recommended in multiple studies. The main purpose of adding calcium oxide is to enhance the engineering properties of AAS and provide more calcium ions for the biochemical reactions induced by the added bacteria. However, inconsistent findings about the influence of calcium oxide have been reported. This research provides further insights into the effect of calcium oxide (CaO) on the performance of microbial self-healing efficiency in AAS composite. The results highlight that incorporating calcium oxide as 7% of the binder partial replacement has an impact on the engineering properties of bio-AAS materials. The study recommends correlating the percentage of free calcium ions within the AAS mixture with the microbial activity.

show abstract

Flexural performance of reinforced Alkali-activated concrete beams incorporating steel and structural Macro synthetic polypropylene fiber

Cited by 20 publications

References 28 publications

Finite Element Modelling of Polypropylene Fibre Reinforced Concrete Beams Reinforced with Steel under Bending

Finite Element Modelling of Polypropylene Fibre Reinforced Concrete Beams Reinforced with Steel under Bending

State-of-the-Art Report: The Self-Healing Capability of Alkali-Activated Slag (AAS) Concrete

The Efficiency of Calcium Oxide on Microbial Self-Healing Activity in Alkali-Activated Slag (AAS)

Contact Info

Product

Resources

About