Experimental and Analytical Modeling of Flexural Impact Strength of Preplaced Aggregate Fibrous Concrete Beams

Murali, G.; Abid, Sallal R.; Vatin, Nikolai

doi:10.3390/ma15113857

Cited by 12 publications

(4 citation statements)

References 49 publications

(55 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plastic region in the load-displacement curves of members under bending loads is calculated for the post-yielding region, which starts from the yielding point of the tension reinforcement to failure. This definition was also facilitated to investigate the effect of fibres and other additives on the post-cracking behaviour of disk specimens subjected to the ACI 544-2R repeated impact, where several previous studies [ 67 , 68 , 69 , 70 ] defined the impact ductility index as the ratio of the failure number to the cracking number (T2/T1). This study also adopted this definition to evaluate the influence of crumb rubber and SF on the enhancement of the failure impact resistance.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Experimental and Statistical Investigation to Evaluate Impact Strength Variability and Reliability of Preplaced Aggregate Concrete Containing Crumped Rubber and Fibres

Swaminathan

Karthikeyan

Subbaram³

et al. 2022

Materials

Self Cite

View full text Add to dashboard Cite

The proper disposal of used rubber tires has emerged as a primary concern for the environment all over the globe. Millions of tires are thrown away, buried and discarded every year, posing a major environmental concern owing to their slow decomposition. As a result, it is advantageous to use recycled waste rubber aggregates as an additional building resource. Recycling crushed rubber would lead to a long-term solution to the problem of decreasing natural aggregate resources while conserving the environment. This study examines the impact strength variability and reliability of preplaced aggregate concrete containing crumped rubber and fibres. Ten different mixtures were prepared by replacing natural aggregate with crumped rubber (5, 10, 15 and 20%). The crumped rubber was pretreated by the water with sodium hydroxide dilution for 30 min before usage. Hooked-end steel fibres were used at a dosage of 1.5%. The compressive strength, impact strength, impact ductility index and failure pattern were examined and discussed. In addition, a statistical method called Weibull distribution is used to analyze the scattered experimental results. The results showed that when the crumb rubber content was raised, the retained first cracking and failure impact numbers increased. As a result of substituting crumb rubber for 20% of the coarse aggregate in plain and fibrous mixes, the percentage development in first crack and failure was between 33 and 76% and 75 to 129%, respectively.

show abstract

Section: Discussion Of Resultsmentioning

confidence: 99%

Experimental and Statistical Investigation to Evaluate Impact Strength Variability and Reliability of Preplaced Aggregate Concrete Containing Crumped Rubber and Fibres

Swaminathan

Karthikeyan

Subbaram³

et al. 2022

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The alleviation of the stress level concentration inside the PAFC was the cause of the uniform stress transmission that occurred [ 33 ]. All of the PAFC specimens fractured in the bottom middle of their span owing to the initiation and cracking continuing towards the specimen’s top surface, which was followed by the specimens trying to break apart into two separate pieces [ 34 ]. Micro-fractures began to show in a highly stressed zone (midspan), and then they spread out into many cracks that moved upward towards the top surface of the specimen.…”

Section: Resultsmentioning

confidence: 99%

Impact Strength of Preplaced Aggregate Concrete Comprising Glass Fibre Mesh and Steel Fibres: Experiments and Modeling

Ponnambalam¹,

Thangavel²,

Murali

et al. 2022

Materials

Self Cite

View full text Add to dashboard Cite

Concrete is the most widely used and most affordable construction material. The structural damage that concrete cracks and fractures may cause can be severe. These concerns have lately been alleviated by new developments in fibre concretes. Recent advancements in fibrous concrete and its evolution have been rapidly drawing researchers’ attentions worldwide, which motivates the development of a new type of composite with superior impact resistance. Preplaced aggregate fibrous concrete (PAFC) is a revolutionary composite comprising a higher dosage of fibres. It has outstanding impact resistance that surpasses those of traditional fibrous concrete. The impact behaviour of PAFC in addition to glass fibre mesh (GFM) has not been investigated thoroughly. To fill this research gap, this study investigates the impact performance of three-layered PAFC comprising steel fibres and GFM insertion. Eight different mixtures were prepared and can be divided into two groups. In the first group, specimens were made with 4% fibres and two single, double and triple layers of GFM insertion between the three-layered concrete. The second group of specimens was reinforced with 5, 2 and 5% steel fibres at the top, middle and bottom layers, respectively. However, the GFM insertion scheme for the second group was the same as the first. Rectangular specimens of size 500 × 100 × 100 mm were cast and tested against drop weight impact. The parameters studied were cracking impact numbers, failure impact number, ductility index and failure patterns. In addition, an analytical model was used to evaluate the impact failure energies. Results indicate that the combined action of steel fibre and GFM exhibited an excellent impact resistance. Increasing the number of GFM insertions between the specimen layer led to increased impact strength. The dose of the fibres utilized in the outer layer of the PAFC was increased, resulting in the material having a higher impact resistance. The cracking impact numbers improved from 28 to 40%, and failure impact numbers ranged from 58.8 to 92.2% when the GFM insertion numbers increased from one to three.

show abstract

“…Holding screw concrete using modified ACI 544-2R impact test procedures [79,80], repeated projectile impact test [81] and repeated flexural impact test [82].…”

Section: Steel Holding Framementioning

confidence: 99%

Recent Literature on Steel Fiber Role in Resistance Improvement of Fibrous Concrete to Repeated Impacts

Özakça

Al-Ameri²,

Karataş³

et al. 2023

ejuow

View full text Add to dashboard Cite

Concrete is a brittle material when subjected to design and accidental impact loads, which are expected along the life span of the structure. To improve the impact performance of concrete, steel fibers are used as short discrete material reinforcing elements. Among the available impact test, the ACI 544-2R repeated impact test is considered as the simplest and cheapest test procedure that needs no sophisticated sensors and costly techniques, which is used as a qualitative tool to evaluate the impact of fibrous concrete. This article introduces a state-of-the-art literature review of the repeated impact performance of steel fiber-reinforced concrete. Rich literature of different steel fiber-reinforced concrete types is reviewed and the effect of steel fibers on the retained cracking and failure impact numbers is highlighted. The sole effects of the geometrical parameters of steel fibers were analyzed in addition to fiber content. Based on the reviewed literature works, it can be summarized that increasing the fiber content increases the bond strength, and using longer fibers affords deeper anchorage lengths inside the cement paste across cracks, which postpone their widening and improves the impact resistance in terms of recorded cracking and failure numbers.

show abstract

Experimental and Analytical Modeling of Flexural Impact Strength of Preplaced Aggregate Fibrous Concrete Beams

Cited by 12 publications

References 49 publications

Experimental and Statistical Investigation to Evaluate Impact Strength Variability and Reliability of Preplaced Aggregate Concrete Containing Crumped Rubber and Fibres

Experimental and Statistical Investigation to Evaluate Impact Strength Variability and Reliability of Preplaced Aggregate Concrete Containing Crumped Rubber and Fibres

Impact Strength of Preplaced Aggregate Concrete Comprising Glass Fibre Mesh and Steel Fibres: Experiments and Modeling

Recent Literature on Steel Fiber Role in Resistance Improvement of Fibrous Concrete to Repeated Impacts

Contact Info

Product

Resources

About