Mechanical and fracture properties of steel fiber-reinforced geopolymer concrete

Zhang, Peng; Jia, Weijia; Li, Qingfu; Wan, Jinyi; Ling, Yifeng

doi:10.1515/secm-2021-0030

Cited by 60 publications

(13 citation statements)

References 75 publications

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“…At present, there is no uniform testing standard for MFA-GPC. Therefore, five specimens with sizes of 100 × 100 × 400 mm were used on the basis of the current research work [ 56 , 57 , 58 ] and the Chinese standard DL/T 5332-2005 [ 59 ], which had a 3 × 40 mm initial notch. The average of triplicate specimens was taken as the result for each mixture.…”

Section: Experimental Investigationmentioning

confidence: 99%

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

Niu

Zhang

Guo

et al. 2022

Gels

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Geopolymers are environmentally friendly materials made from industrial solid waste with high silicon and aluminum contents, and municipal solid waste incineration fly ash (MFA) contains active ingredients such as Si, Al and Ca. According to this fact, a green and low-carbon geopolymer concrete was prepared using MFA as a partial replacement for metakaolin in this study. The mechanical properties of the MFA geopolymer concrete (MFA-GPC) were investigated through a series of experiments, including a compressive strength test, splitting tensile strength test, elastic modulus test and three-point bending fracture test. The effect of the MFA replacement ratio on the microstructure of MFA-GPC was investigated by SEM test, XRD analysis and FTIR analysis. MFA replacement ratios incorporated in GPC were 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40% by replacing metakaolin with equal quality in this study. In addition, toxic leaching tests of MFA and MFA-GPC were performed by ICP-AES to evaluate the safety of MFA-GPC. The results indicated that the mechanical properties of MFA-GPC decreased with the increase of the MFA replacement ratio. Compared with the reference group of GPC without MFA, the maximum reduction rates of the cubic compressive strength, splitting tensile strength, axial compressive strength, elastic modulus, initiation fracture toughness, unstable fracture toughness and fracture energy of MFA-GPC were 83%, 81%, 78%, 93%, 77%, 73% and 61%, respectively. The microstructure of MFA-GPC was porous and carbonized; however, the type of hydrated gel products was still a calcium silicoaluminate-based silicoaluminate gel. Moreover, the leaching content of heavy metals from MFA-GPC was lower than that of the standard limit. In general, the appropriate amount of MFA can be used to prepare GPC, and its mechanical properties can meet the engineering requirements, but the amount of MFA should not be too high.

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Section: Experimental Investigationmentioning

confidence: 99%

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

Niu

Zhang

Guo

et al. 2022

Gels

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“…To demonstrate the effect using recycled aggregate, the results of this study were compared to another study conducted by Zhang et al [24] which had nearly the same aggregate/cementitious materials ratio but with natural river aggregate. For the same content of steel fiber ranging from 0% to 1.5%, Zhang et al [24] obtained GC mixes with compressive strength between 43 MPa to 50 MPa.…”

Section: Concrete Compressive Strengthmentioning

confidence: 99%

“…Recently, many experimental studies were conducted in order to investigate the behaviour if fiber reinforced geopolymer concrete [22][23][24]. However, for the Steel Fiber Reinforced Geopolymer Concrete (SFRGC) to be valuable construction material, it must compete economically with the existing reinforcing system.…”

Section: Introduction Amentioning

confidence: 99%

Evaluation of Steel Fiber Reinforced Geopolymer Concrete Made of Recycled Materials

Goaiz¹,

Shamsaldeen²,

Abdulrehman³

et al. 2022

IJE

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In the last few decades, the geopolymer concrete presented an evolution in civil engineering field. The current study aims to produce a low cost steel fiber reinforced geopolymer concrete with an ecceptable tensile properties. The experimental program aims to investigate the tensile behaviour of geopolymer concrete reinforced with steel fiber and made of recycled materials. The primary ingredients of the steel fiber reinforced geopolymer concrete in this study were waste materials. The recycled steel fiber was extracted from tires and chopped into tiny fibers with an average length of 20 mm and an average diameter of 0.7 mm. The geopolymer concrete in this study consisted of coarse aggregate, which was crushed recycled concrete. Also, the fine aggregate was crushed waste glass. In addition to the compressive strength, tensile test procedures such as splitting tensile strength, double punch tensile strength, and flexural tensile strength were all investigated in this study. Recycled steel fiber was compared to a new hooked-end steel fiber and hybrid steel fiber (50% new + 50% recycled) with three different volumetric percentages of steel fiber (0.5%, 1.0%, and 1.5%). The new steel fiber geopolymer concrete mix with 1.5% of steel fiber showed the highest test results among other mixes, as the tensile strength was increased by nearly 50% in the case of the double punch test. This conduct could be explained as the new steel fiber having a uniform, straight shape with hooked ends, increasing the anchorage between the fly ash binder and the steel fiber. In addition, the recycled steel fiber was contained some rubber crumbs that could be another reason that negatively affected the tensile properties of the geopolymer concrete.

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“…The incorporation of hybrid fibres significantly improved the tensile behaviour of TGPC. This can be attributed to the bridging effect of the hybrid fibres at different levels, which reduces the coalescence of cracks in the geopolymer concrete [42]. Simultaneously, the steel fibres' high bond strength with TGPC delayed the pull-out of the fibres [43].…”

Section: Split Tensile Strengthmentioning

confidence: 99%

Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

2021

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The primary aim of this research is to find an alternative for Portland cement using inorganic geopolymers. This study investigated the effect of steel and polypropylene fibres hybridisation on ternary blend geopolymer concrete (TGPC) engineering properties using fly ash, ground granulated blast furnace slag (GGBS) and metakaolin as the source materials. The properties like compressive strength, splitting tensile strength, flexural strength and modulus of elasticity of ternary blend geopolymer concrete. The standard tests were conducted on TGPC with steel fibres, polypropylene fibres and a combination of steel and polypropylene fibres in hybrid form. A total number of 45 specimens were tested and compared to determine each property. The grade of concrete considered was M55. The variables studied were the volume fraction of fibres, viz. steel fibres (0%, 0.5% and 1%) and polypropylene fibres (0%, 0.1%, 0.15%, 0.2% and 0.25%). The experimental results reveal that the addition of fibres in a hybrid form enhances the mechanical properties of TGPC. The increase in the compressive strength was nominal, and a significant improvement was observed in splitting tensile strength, flexural strength, and modulus of elasticity. Also, an attempt to obtain the relation between the different engineering properties was made with different volume fractions of fibre.

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Mechanical and fracture properties of steel fiber-reinforced geopolymer concrete

Cited by 60 publications

References 75 publications

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

Evaluation of Steel Fiber Reinforced Geopolymer Concrete Made of Recycled Materials

Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

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