Spatial representation of fiber bridging forces in strain-hardening cement composites

Kang, Jingu; Bolander, John E.

doi:10.21012/fc9.299

Cited by 5 publications

(3 citation statements)

References 22 publications

(27 reference statements)

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“…To guarantee the stability of the strain-hardening property, the fracture toughness would maintain a relatively low level. For this reason, some kinds of special aggregates, such as crumb rubbers, geopolymer, were introduced into the system of ECC as flaws to further lower the matrix fracture toughness [28][29][30][31]. The RS mentioned above can also be classified as this kind of aggregate.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Recycled Sand on the Tensile Properties of Engineered Cementitious Composites

et al. 2022

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This research aims to investigate the feasibility of replacing natural sand (NS) with recycled sand (RS) to enhance the mechanical property of engineered cementitious composites (ECC). For a comparative study, ECCs incorporating natural sands (NS) and recycled sands with different sieve sizes were taken as experimental subjects. The results demonstrated that RS-ECC possessed better tensile properties featuring saturated cracks and superior strain-hardening behavior than that of NS-ECC. The highest tensile strain capacity of RS-ECC was up to 7%. Meanwhile, the compressive and flexural strengths of RS-ECC were over 50 and 20 MPa. The pseudo-strain-hardening (PSH) index of the RS-ECC-20 grid and RS-ECC-12 grid were 141 and 201, which increased by 46% and 70% than that of NS-ECC. Furthermore, the thicker weak ITZ and comparatively aggregate/ITZ ratio were found in the RE-ECC by a microstructure test, which revealed and explained the mechanism for the lower matrix fracture toughness of RS-ECC.

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Section: Introductionmentioning

confidence: 99%

The Effect of Recycled Sand on the Tensile Properties of Engineered Cementitious Composites

et al. 2022

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“…Considering these limitations, few advanced models are also studied which consider the effect of each fibre in the matrix and attempts to model the post multiple cracking behaviour. Most frequently studied are rigid body spring models [13,14] and lattice models [15,16]. In contrast to the technical work done in this field, an overview of FEM modelling approaches for SHCC materials is lacking.…”

Section: Introductionmentioning

confidence: 99%

Different Approaches for FEM Modelling of Strain-Hardening Cementitious Composites

2021

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Strain-hardening cementitious composites (SHCCs) are a special class of fibre-reinforced concretes which develop multiple, fine cracks when subjected to an increasing tensile load. This ensures remarkably high strain capacities of up to several percent, making SHCC an advantageous material both for new structures subjected to high mechanical loading or in severe environmental conditions and for the retrofitting/strengthening of existing structures by application of thin SHCC layers.Finite element modelling (FEM) can be an efficient tool to predict the behaviour of SHCC under different loading types. This paper lists some recent advances in finite element modelling of strain hardening fibre reinforced cementitious composites. Based on a comprehensive literature review two main approaches are highlighted, the continuum model approach and the advanced lattice modelling approach. This paper provides an overview of both approaches and their functionalities with respect to each other, based on results from literature. The work reported in this paper is part of a larger study into the use of SHCC for shear strengthening of existing concrete structures.

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“…The first condition ensures that the fracture failure process is governed by the bridging fibers while the second condition ensures subsequent formation of closely-spaced cracks after the first crack is formed. Hereafter, Li and co-workers further developed the theories [5,6] and came up with practical approaches for the making of PDCC, such as tailoring of interfacial properties [7] , reduction of matrix toughness by limiting the particle size in the cementitious matrix [8] and the incorporation of uniformly distributed artificial flaws [9] . Specifically, artificial flaws are introduced in the matrix by the incorporation of bubbles, glass or plastic beads, lightweight aggregates, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rubber Particles on Properties of Pseudo-Ductile Cementitious Composites

Pang¹,

Leung

Sun³

2014

AMR

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Pseudo-ductile cementitious composites (PDCC) are a new type of special discontinuous random-fibers reinforced cementitious composites with high tensile ductility achieved by the uniform formation of multiple cracks along the length of the specimen. In the present study, rubber particle was introduced into the cementitious composites as the artificial flaw. The tensile properties, compressive strength, water permeability and shrinkage of PDCC with various volume contents and size of rubber particles were measured. The test results show that incorporation of rubber particle will reduce the compressive strength and first cracking strength of PDCC. With increased size and volume of rubber particles, the compressive strength is increased. To achieve maximum tensile ductility, optimum rubber content and size should be employed. Water permeability is found to be similar for various PDCC mixes with or without rubber addition. The content of rubber particle plays a significant role on the dry shrinkage of PDCC, while the particle size only has a slight effect.

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Spatial representation of fiber bridging forces in strain-hardening cement composites

Cited by 5 publications

References 22 publications

The Effect of Recycled Sand on the Tensile Properties of Engineered Cementitious Composites

The Effect of Recycled Sand on the Tensile Properties of Engineered Cementitious Composites

Different Approaches for FEM Modelling of Strain-Hardening Cementitious Composites

Effect of Rubber Particles on Properties of Pseudo-Ductile Cementitious Composites

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