Development of recycled strain-hardening cement-based composite (SHCC) for sustainable infrastructures

Choi, Wonchang; Kang, Jian; Kim, Sun-Woo

doi:10.1016/j.compositesb.2011.11.060

Cited by 75 publications

(34 citation statements)

References 8 publications

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“…Further studies should investigate the effect of silica fume forms on the rate of strength development at late states of the geopolymerization process, and also the potential role of ultra-fine silica fume in increasing chloride resistance and improving material durability. It is noted that various fibre types could be utilized to generate strain hardening cementitious materials [36,49]. However, due to the large number of geopolymer matrix composition mixtures assessed in this study, the discussion here is limited to (2%volume fraction) steel fibres.…”

Section: 3mentioning

confidence: 99%

Steel fibre reinforced geopolymer concrete (SFRGC) with improved microstructure and enhanced fibre-matrix interfacial properties

Al-Majidi

Λαμπρόπουλος

Cundy

2017

Construction and Building Materials

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Geopolymers are aluminosilicate materials formed by mixing by-product materials with alkaline solutions, and which have several desirable properties compared to Portland cement concrete in terms of strength and durability. Most of the previous research on steel fibre reinforced geopolymer concrete (SFRGC) has focused on the properties of single or binary mixes hardened under heat curing conditions, which is a severe limitation for on-site, cast-inplace applications. In the current study, a novel plain and steel fibre reinforced geopolymer concrete (SFRGC), containing various types of commercial Silica Fume (SF) (densified, undensified and slurry silica fume) and varying Ground Granulated Blast Furnace Slag (GGBS) content in a ternary binder mixture, cured under ambient (room) temperature has been examined. An extensive experimental investigation was conducted to evaluate the fresh properties, mechanical characteristics and microstructure of the examined material. The experimental results indicate that the mechanical characteristics of all the examined mixes are enhanced by increasing the GGBS content, in both plain and steel fibre reinforced geopolymer concrete. Geopolymer concrete with undensified silica fume showed better mechanical strength compared to that with densified and slurry SF, due to the agglomeration and ineffective dispersion of the latter fume types. SEM microstructural observations and porosity measurements were also conducted. The results indicate that the inclusion of silica fume and increasing GGBS content leads to higher pozzolanic activity and pore infilling, providing relatively homogeneous, compact and dense microstructures and subsequently improved mechanical properties.

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Section: 3mentioning

confidence: 99%

Steel fibre reinforced geopolymer concrete (SFRGC) with improved microstructure and enhanced fibre-matrix interfacial properties

Al-Majidi

Λαμπρόπουλος

Cundy

2017

Construction and Building Materials

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“…Specifically, (1) Deflections of hybrid 1%V F HE fibre with micro fibre (1% and 2% V f ) are 2 and 4 times larger than the deflection of macro 1%HE alone. (2) Toughness of the hybrid 1%V F HE fibre with micro fibre (1% and 2% V f ) is [3][4][5][6][7][8][9][10][11][12][13][14] times higher for the first cracking and 3.6-5.3 times higher at second cracking than for specimens containing macrofibres alone. • SEM analysis show that the geopolymer matrix is compacted, well connected and that the strength bonding between fibre and matrix (with the exception of glass fibres) was good.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the addition of fibres to a concrete mix considerably enhances many of the mechanical properties of concrete such as flexural, impact, tensile and abrasion strength, and post cracking behaviour [2]. FRCCs with higher ductility, such as strain hardening cementitious composites, however need higher contents of cement than normal concrete in order to develop the interfacial bond characteristics and to account for the absence of coarse aggregates in the mixture design [3]. Using high cement amounts leads to increased heat of hydration, higher shrinkage and is more energy intensive [4].…”

Section: Introductionmentioning

confidence: 99%

“…Their results showed that a high volume of FA can reduce the drying shrinkage, crack width, and improve tensile ductility, although this also reduced the 28 days compressive strength. Choi et al [3] investigated the effect of partial replacement of cement by recycled materials on the mechanical properties of strain hardening cementitious material (SHCC). Alternative byproduct materials (FA, sand, and polyethylene terephthalate (PET) fibers) were used to partially replace cement, silica sand, and polyvinyl alcohol (PVA) fibers, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties of a novel fibre reinforced geopolymer composite with enhanced strain hardening characteristics

Al-Majidi

Λαμπρόπουλος

Cundy

2017

Composite Structures

103

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Strain hardening cementitious concrete is a type of fibre reinforced concrete with enhanced mechanical properties, including strain hardening and ductility. Geopolymer (cement-free) materials represent promising more sustainable alternatives to ordinary Portland cement. Heat treatment however is crucial when using geopolymer materials, to provide comparable mechanical properties to conventional concrete, and there are a number of practical limitations in the application of heat curing in large-scale structures.The main aim of this study is to develop and evaluate the mechanical properties of a novel, sustainable strain hardening fibre-reinforced geopolymer composite material, cured under ambient temperature and thus suitable for cast-in-place applications. In particular, the effect of incorporation of discontinuous fibres on the mechanical performance and on the microstructure of the composite geopolymer materials has been evaluated. The results indicate that room temperature cured, cement-free, strain hardening geopolymer concrete with superior deflection capacity can be produced using a ternary geopolymer binder mix reinforced by 2%PVA fibre or with 2% and 3% of 13mm length steel fibre.

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“…It is not except for high performance FRCCs such as SHCC materials. Choi et al [ 7 ] showed that 2SHCC material used in this study reduced carbon dioxide (CO 2 ) emissions by about 20%, although this estimate can be vary depending on local conditions at the source of raw materials, binder quantity and amount of Ordinary Portland cement (OPC) replacement, type of manufacturing facilities, climate, energy sources, and transportation distances.…”

Section: Introductionmentioning

confidence: 88%

Influence of Rapid Freeze-Thaw Cycling on the Mechanical Properties of Sustainable Strain-Hardening Cement Composite (2SHCC)

et al. 2014

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This paper provides experimental results to investigate the mechanical properties of sustainable strain-hardening cement composite (2SHCC) for infrastructures after freeze-thaw actions. To improve the sustainability of SHCC materials in this study, high energy-consumptive components—silica sand, cement, and polyvinyl alcohol (PVA) fibers—in the conventional SHCC materials are partially replaced with recycled materials such as recycled sand, fly ash, and polyethylene terephthalate (PET) fibers, respectively. To investigate the mechanical properties of green SHCC that contains recycled materials, the cement, PVA fiber and silica sand were replaced with 10% fly ash, 25% PET fiber, and 10% recycled aggregate based on preliminary experimental results for the development of 2SHCC material, respectively. The dynamic modulus of elasticity and weight for 2SHCC material were measured at every 30 cycles of freeze-thaw. The effects of freeze-thaw cycles on the mechanical properties of sustainable SHCC are evaluated by conducting compressive tests, four-point flexural tests, direct tensile tests and prism splitting tests after 90, 180, and 300 cycles of rapid freeze-thaw. Freeze-thaw testing was conducted according to ASTM C 666 Procedure A. Test results show that after 300 cycles of freezing and thawing actions, the dynamic modulus of elasticity and mass loss of damaged 2SHCC were similar to those of virgin 2SHCC, while the freeze-thaw cycles influence mechanical properties of the 2SHCC material except for compressive behavior.

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Development of recycled strain-hardening cement-based composite (SHCC) for sustainable infrastructures

Cited by 75 publications

References 8 publications

Steel fibre reinforced geopolymer concrete (SFRGC) with improved microstructure and enhanced fibre-matrix interfacial properties

Steel fibre reinforced geopolymer concrete (SFRGC) with improved microstructure and enhanced fibre-matrix interfacial properties

Tensile properties of a novel fibre reinforced geopolymer composite with enhanced strain hardening characteristics

Influence of Rapid Freeze-Thaw Cycling on the Mechanical Properties of Sustainable Strain-Hardening Cement Composite (2SHCC)

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