Fracture Energy of Foamed Concrete: Numerical Modelling Using the Combined Finite-Discrete Element Method

Jaini, Zainorizuan Mohd; Rahman, Norashidah Abd; Rum, R. H. M.; Haurula, M. M.

doi:10.1051/matecconf/201710302030

Cited by 6 publications

(7 citation statements)

References 9 publications

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“…The tensile strength of FRFC has been improved, as compared to those plain FC mix. The American Concrete Institute [ 193 ] suggested adding fibres to benefit the splitting tensile strength at an early age. Most of the FRFC can achieve the minimum requirement of 2 MPa of ASTM C330 [ 194 ] for structural concrete.…”

Section: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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Section: Properties Of Frfcmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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“…The presence of voids on foamed concrete was totally ignored. The elastic properties, in term of Young's Modulus, E, Poisson's ratio, v and density, ρ were taken from a similar subset of foamed concrete reported in Jaini et al (2017). However, the values of flexural strength, σ o and fracture energy, G c were calculated using semi-empirical equations.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Fracture energy is regarded as unique material properties and independent of beam size, shape, structure, presence of the reinforcement and also loading condition. Nevertheless, fracture energy can be determined from experimental investigation and analytical analysis (Jaini et al, 2017). For analytical analysis, the fracture energy used available closed-form fracture energy formulations reported in Hillerborg model (1985), CEP-fib model (1993) and Bazant model (2002).…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Foamed Concrete Beam under Flexural Using Traction-Separation Relationship

Ahmad

Sugiman

Jaini

et al. 2021

Lat. Am. j. solids struct.

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The aim of the current project is to carry out the FEA framework for predicting the flexural strength of notched foam concrete tested under three-point bending following the conducted experimental set-up. The investigated testing series have a variation of notch size opening in the foamed concrete beam. The Tractionseparation relationship was used as a constitutive model to incorporate independent material properties and used in the modelling framework. Modelling techniques of 2D XFEM and CZM were adopted and later expanded to 3D XFEM models. Good agreement was found between the predicted structure response and experimental observation for all the investigated models. Crack was initiated at the crack tip and propagated to the beam edge under the applied load. It was found that the average discrepancies below 20% were found within XFEM techniques. Less agreement was found using the CZM models, partly due to the simplification of the adopted failure path. The modelling framework implemented in this project is potentially used as a predictive tool in estimating the flexural strength of the concrete beam with notches.

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“…Fracture energy is the energy dissipated that is supplied to a growing crack tip and balanced by the energy dissipated from new surfaces' formation. FC beams' fracture energy was identified with three-point bending tests on jagged beam samples [117,118]. The fracture strength increased in relation to the increments of compressive strength and density.…”

Section: Refsmentioning

confidence: 99%

Design Efficiency, Characteristics, and Utilization of Reinforced Foamed Concrete: A Review

et al. 2020

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Foam concrete (FC) serves as an efficient construction material that combines well thermal insulation and structural properties. The studies of material characteristics, including the mechanical, physical, rheological, and functional properties of lightweight concrete, have been conducted rigorously. However, a lack of knowledge on the design efficiency of reinforced FC (RFC) was found in current research trends, compared to reinforced lightweight aggregate concrete. Therefore, this paper presents a review of the performance and adaption in structures for RFC. According to the code specifications, the feasibility investigation was preliminarily determined in structural use through the summary for the mechanical properties of FC of FC’s mechanical properties. For reinforced concrete design, a direct method of reduction factors is introduced to design lightweight aggregate concrete, which is also suggested to be adapted into a lightweight FC design. It was found that flexural shear behavior is a more complex theoretical analysis than flexure. However, a reduction factor of 0.75 was recommended for shear, torsion, and compression; meanwhile, 0.6 for flexural members. Serviceability limit states design should be applied, as the crack was found predominant in RFC design. The deflection controls were recommended as 0.7 by previous research. Research on RFC’s compression members, such as a column or load load-bearing wall, were rarely found. Thus, further study for validating a safe design of RFC applications in construction industries today is highly imperative.

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Fracture Energy of Foamed Concrete: Numerical Modelling Using the Combined Finite-Discrete Element Method

Cited by 6 publications

References 9 publications

Fibre-Reinforced Foamed Concretes: A Review

Fibre-Reinforced Foamed Concretes: A Review

Numerical Modelling of Foamed Concrete Beam under Flexural Using Traction-Separation Relationship

Design Efficiency, Characteristics, and Utilization of Reinforced Foamed Concrete: A Review

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