Investigation on flexural toughness evaluation method of steel fiber reinforced lightweight aggregate concrete

Li, Jing jun; Wan, Chaojun; Niu, Jian; Wu, Liqun; Wu, Yun

doi:10.1016/j.conbuildmat.2016.11.101

Cited by 103 publications

(22 citation statements)

References 29 publications

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“…Very fine aggregates absorb water, thus reducing the total amount of water required to maintain consistency, which consequently makes the concrete less plastic. This explains why the slump results were lower than those obtained elsewhere [25,26]. Moreover, concretes with medium to low contents of residues (T2, T9, T3 and T7) presented far better consistency when compared to concrete with high PPR and LSR levels (T1, T4, T5, T6 and T8).…”

Section: Resultscontrasting

confidence: 41%

“…All concrete samples produced had density less than 1700 kg/m³. This value is 10% lower than reported elsewhere [25,27,28] and 1850 kg/m³, which is the density that ACI 213-87R [24] recommends for lightweight concrete, and at least 20% lower than those reported for lightweight concrete [26,30]. The low density of concretes is due to the replacement of normal coarse aggregates of density around 2600 kg/m³ by EC0500 and EC1506 with densities of 1230 and 930 kg/m³, respectively.…”

Section: Slump (Cm)mentioning

confidence: 41%

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Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

2017

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The recent increase in the construction industry has transformed concrete into an ideal choice to recycle a number of residues formerly discarded into the environment. Among various products, porcelain tile polishing, limestone and tire rubber residues are potential candidates to replace the fine aggregate of conventional mixtures. The aim of this study was to investigate the effect of the addition of varying contents of these residues in lightweight concrete where expanded clay replaced gravel. To that end, slump, compressive strength, density, void ratio, porosity and absorption tests were carried out. The densities of all concrete formulations studied were 10% lower to that of lightweight concrete (<1.850 kg/m³). Nevertheless, mixes containing 10 to 15% of combined residues reduced absorption, void ratio and porosity, at least 17% lower compared to conventional concrete. The strength of such formulations reached 27 MPa at 28 days with consistency of 9 to 12 cm, indicating adequate consistency and increased strength. In addition, the combination of low porosity, absorption and voids suggested improved durability.

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Section: Resultscontrasting

confidence: 41%

Section: Slump (Cm)mentioning

confidence: 41%

Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

2017

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“…HyFRC2 HyFRC3 deflection in the load-deflection curve and this is also an issue in ASTM C1018 method (Jun Li et al 2017). Therefore, if the first crack point is observed earlier than it results in higher energies absorbed and toughness.…”

Section: Hyfrc Hyfrc1mentioning

confidence: 99%

Influence of CaCO3 whiskers, steel fibers and basalt fibers hybridization on flexural toughness of concrete

Khan¹,

Cao²,

Ali³

2019

Sustainable Construction Materials and Technologies (SCMT)

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Nowadays, hybrid fiber reinforced concrete is developed with the combination of CaCO3 whiskers, steel and basalt fibers due to their enhanced mechanical properties of structural applications. In this study, the effect of different basalt fiber contents on flexural strength of hybrid fiber reinforced concrete (HyFRC) is investigated. In addition to this, the energy absorbed (E), toughness indices (TI) up to specified point and residual strength factor (RSF) are also calculated according to the ASTM C1018. The steel fibers and CaCO3 whiskers having contents of 5% each, by cement mass, are added. To prepare HyFRC, HyFRC1, HyFRC2, and HyFRC3, different basalt fiber content of 0%, 2.5%, 5% and 7.5%, respectively, are added. The increment in flexural strength of HyFRC up to 16% is observed. Future recommendations are to optimize basalt fiber length and content for mechanical properties of HyFRC.

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“…Steel fiber is used most often, owing to its excellent environmental action-resistance and economic effects [19,20]. Li et al investigated the flexural behavior of LWAC with steel fiber and the test results showed that the steel fiber could significantly improve the compressive and flexural strength of LWAC, as well as the post-cracking behavior [21]. Li et al researched the shear performance of steel fiber-reinforced LWAC beams and reported that the shear-resistance capacity was enhanced by 25.1%, 35.9% and 43.6% with steel fiber amounts of 0.4%, 0.8% and 1.2%, respectively, as compared to those without fiber reinforcement [22].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Chopped Basalt Fiber-Reinforced Lightweight Aggregate Concrete and Chopped Polyacrylonitrile Fiber Reinforced Lightweight Aggregate Concrete

et al. 2020

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In this study, an experimental investigation was conducted on the mechanical properties of lightweight aggregate concrete (LWAC) with different chopped fibers, including basalt fiber (BF) and polyacrylonitrile fiber (PANF). The LWAC performance was studied in regard to compressive strength, splitting tensile strength and shear strength at age of 28 days. In addition, the oven-dried density and water absorption were measured as well to confirm whether the specimens match the requirement of standard. In total, seven different mixture groups were designed and approximately 104 LWAC samples were tested. The test results showed that the oven-dried densities of the LWAC mixtures were in range of 1.819–1.844 t/m3 which satisfied the definition of LWAC by Chinese Standard. Additionally, water absorption decreased with the increasing of fiber content. The development tendency of the specific strength of LWAC was the same as that of the cube compressive strength. The addition of fibers had a significant effect on reducing water absorption. Adding BF and PANF into concrete had a relatively slight impact on the compressive strength but had an obvious effect on splitting tensile strength, flexural strength and shear strength enhancement, respectively. In that regard, a 1.5% fiber volume fraction of BF and PANF showed the maximum increase in strength. The use of BF and PANF could change the failure morphologies of splitting tensile and flexural destruction but almost had slight impact on the shear failure morphology. The strength enhancement parameter β was proposed to quantify the improvement effect of fibers on cube compressive strength, splitting tensile strength, flexural strength and shear strength, respectively. And the calculation results showed good agreement with test value.

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Investigation on flexural toughness evaluation method of steel fiber reinforced lightweight aggregate concrete

Cited by 103 publications

References 29 publications

Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

Formulation and characterization of structural lightweight concrete containing residues of porcelain tile polishing, tire rubber and limestone

Influence of CaCO3 whiskers, steel fibers and basalt fibers hybridization on flexural toughness of concrete

Mechanical Properties of Chopped Basalt Fiber-Reinforced Lightweight Aggregate Concrete and Chopped Polyacrylonitrile Fiber Reinforced Lightweight Aggregate Concrete

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