Mechanical characterization of structural lightweight aggregate concrete made with sintered fly ash aggregates and synthetic fibres

Sahoo, Sumit; Selvaraju, Arun Kumar; Prakash, S. Suriya

doi:10.1016/j.cemconcomp.2020.103712

Cited by 65 publications

(21 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synthetic fibers such as polyolefin-based macro-synthetic fibers can also improve the structural performance of concrete, addressing the adverse effects of steel fibers, such as reduced workability and durability issues due to corrosion [29,[31][32][33]. Past studies [16,[34][35][36][37][38][39] have shown that synthetic fiber reinforced concrete (SynFRC) effectively improves tensile behavior, especially in the post-peak. With improved fracture behavior and crack control due to the addition of discrete fibers, web reinforcement requirements in the deep beams may be reduced or completely replaced with discrete fibers in the concrete.…”

Section: Discrete Fibers In Concretementioning

confidence: 99%

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Sagi

Lakavath

Prakash

et al. 2021

Fibers

View full text Add to dashboard Cite

This study investigates the possibility of replacing the minimum web reinforcement in deep beams with discrete fibers. Additionally, the equivalent dosage of fibers required to obtain similar performance of the deep beam with minimum web reinforcement is investigated. Deep beams made of plain concrete with no fibers, beams with minimum web reinforcement as per AASHTO LFRD recommendations (0.3% in both horizontal and vertical), and with a 0.5% volume fraction of steel, macro-synthetic and hybrid fibers are tested at a shear span to height ratio (a/h) of one. Test results show that the presence of 0.3% web reinforcement in horizontal and vertical directions increased the peak load by 25% compared to the plain concrete beams. However, it did not significantly change the first diagonal crack load. With the addition of 0.5% of steel, macro-synthetic and hybrid fibers, the peak load increased by 49%, 42%, and 63%, respectively, compared to the plain concrete specimen. The addition of steel fibers significantly improved the first cracking load. In contrast, macro-synthetic fibers did not affect the first cracking load but improved the ductility with higher deflections at peak. Hybridization of steel and macro synthetic fibers showed improved performance compared to the individual fibers of the same volume in peak load and ductility. Test results showed that a 0.5% volume fraction of discrete macro steel or synthetic or hybrid fibers can be used to completely replace the minimum web reinforcement (0.3% in both directions).

show abstract

Section: Discrete Fibers In Concretementioning

confidence: 99%

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Sagi

Lakavath

Prakash

et al. 2021

Fibers

View full text Add to dashboard Cite

show abstract

“…The residue is melted and sintered to form cinders. Sintered fly ash is developed at a temperature of 1100-1300 • C [17]. They have a hard, coarse red shell and fine pore structures, which are commercially available in a size range of 7 to 30 mm.…”

Section: Manufactured/artificial Aggregatementioning

confidence: 99%

Industrial Wastes-Cum-Strength Enhancing Additives Incorporated Lightweight Aggregate Concrete (LWAC) for Energy Efficient Building: A Comprehensive Review

2021

View full text Add to dashboard Cite

Lightweight aggregate concrete (LWAC) exhibits the advantages of thermal insulation, reduces energy consumption building costs, improves building efficiency and easy construction. Furthermore, the utilization of industrial wastes in concrete is advantageous in terms of environmental sustainability. In order to explore this, several researchers investigated the idea of integrating industrial wastes in LWAC. However, the lack of knowledge regarding the performance of industrial waste-based lightweight aggregate concrete hinders the adaptation of this concept and application of LWAC in the construction sector. Therefore, this paper summarizes the research in relation to the sustainable LWACs containing oil palm shell (OPS), lightweight expanded clay aggregate (LECA), vermiculite, perlite, pumice and sintered fly ash as lightweight aggregate, along with industrial wastes and strength-enhancing additives (viz. fibers, polymers, etc.). Firstly, desirable physical, chemical, morphological and mineralogical characterization of different lightweight aggregates are presented, and then a comprehensive overview on fresh, hardened, durability and thermal properties of LWAC incorporating industrial wastes are discussed in comparison with normal weight concrete. The review also highlights the current challenges and suggests the research gaps for further development of eco-friendly LWAC. It is concluded that vermiculite, perlite, pumice, OPS, sintered fly ash and LECA with some suitable industrial waste materials have the potential to be used in the construction sector. Moreover, LWAC with industrial waste has 50–65% lower carbon emission (kg CO2 eq/m3) in the environment. The scientific contribution of this paper provides insights into different LWACs and the knowledge base for future research and paradigm shift of using LWACs as more common alternative building materials.

show abstract

“…Recycling and reusing fly ash activate the so-called "misplaced resource" in terms of manufacturing the fly ash ceramsite. LAC made of fly ash ceramsite has the characteristics of low weight, high heat preservation and insulation, as well as excellent seismic performance; therefore, it has good application prospects [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression

Chen

et al. 2022

Materials

View full text Add to dashboard Cite

This paper investigates the compression behavior and failure criteria of lightweight aggregate concrete (LAC) under triaxial loading. A total of 156 specimens were tested for three parameters: concrete strength, lateral confining pressure and aggregate immersion time, and their effects on the failure mode of LAC and the triaxial stress-strain relationship of LAC is studied. The research indicated that, as the lateral constraint of the specimen increases, the failure patterns change from vertical splitting failure to oblique shearing failure and then to indistinct traces of damage. The stress-strain curve of LAC specimens has an obvious stress plateau, and the curve no longer appears downward when the confining pressure exceeds 12 MPa. According to the experimental phenomenon and test data, the failure criterion was examined on the Mohr–Coulomb theory, octahedral shear stress theory and Rendulic plane stress theory, which well reflects the behavior of LAC under triaxial compression. For the convenience of analysis and application, the stress-strain constitutive models of LAC under triaxial compression are recommended, and these models correlate well with the test results.

show abstract

Mechanical characterization of structural lightweight aggregate concrete made with sintered fly ash aggregates and synthetic fibres

Cited by 65 publications

References 31 publications

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Industrial Wastes-Cum-Strength Enhancing Additives Incorporated Lightweight Aggregate Concrete (LWAC) for Energy Efficient Building: A Comprehensive Review

Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression

Contact Info

Product

Resources

About