Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

Lao, Jian-Cong; Huang, Botao; Fang, Yi; Xu, Ling-Yu; Dai, Jianhua; Shah, Surendra P.

doi:10.1016/j.cemconres.2022.107075

Cited by 64 publications

(14 citation statements)

References 112 publications

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“…It is worth mentioning that in the previous work, the authors have successfully designed and developed steel-fiber-reinforced SH-UHPGC with an ultra-high compressive strength up to 220 MPa and PE-fiberreinforced SH-UHPGC [or Ultra-High-Strength Engineered Geopolymer Composites, (UHS-EGC)] with compressive strength over 180 MPa and tensile strain capacity over 9%. Detailed information can be found in Lao et al (2022), Lao et al (2023).…”

Section: Discussionmentioning

confidence: 99%

“…From the figure, the highest tensile strain capacity (0.44%) and tensile strength (11.9 MPa) were achieved in C50S50, indicating the excellent tensile performance of the mix using hybrid Na 2 SiO 3 and Na 2 CO 3 activators. Considering that the tensile strength of strain-hardening cementitious (geopolymer) composites is highly dependent on the fiber/matrix bond (Lao et al, 2023), the highest tensile strength of C50S50 can be attributed to the highest reaction degree of the matrix (as presented in Figure 6). In…”

Section: Tensile Performance and Cracking Behavior 41 Tensile Perform...mentioning

confidence: 99%

“…In recent decades, geopolymer, which is known as a clinker-free lowcarbon binder, has a good potential to be a sustainable replacement for Portland cement, and has gradually attracted increasing attentions of researchers (Li et al, 2019;Amran et al, 2020;Xu et al, 2021a;Peng et al, 2022;Peng et al, 2023). Since geopolymer can present a similar mechanical performance with the cement paste, it has been successfully adopted to produce different types of advanced sustainable construction materials, such as artificial geopolymer aggregates (Xu et al, 2021b;Qian et al, 2022;Qian et al, 2023), Engineered/Strain-Hardening Geopolymer Composites (EGC/SHGC) (Yoo et al, 2022b;Lao et al, 2023), and ultra-high-performance geopolymer concrete (UHPGC) (Ambily et al, 2014;Ranjbar et al, 2017;Wetzel and Middendorf, 2019;Liu et al, 2020a;Liu et al, 2020b;Lao et al, 2022). Here, it is mentioned that strain-hardening can also be achieved in UHPGC through proper matrix design and fiber utilization, and this material can be termed as strain-hardening UHPGC (SH-UHPGC) (Lao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Utilization of sodium carbonate activator in strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC)

Lao

Huang

et al. 2023

Front. Mater.

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In this study, strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC) was produced using Na2CO3, Na2SiO3 and their hybridization (1:1 in mole ratio) as alkaline activators. An ultra-high compressive strength was achieved for all the developed strain-hardening ultra-high-performance geopolymer concrete (i.e., over 130 MPa). Strain-hardening ultra-high-performance geopolymer concrete with hybrid Na2CO3 and Na2SiO3 activators showed the highest compressive strength (186.0 MPa), tensile strain capacity (0.44%), and tensile strength (11.9 MPa). It should be highlighted that very significant multiple cracking can be observed for all the strain-hardening ultra-high-performance geopolymer concrete even at a very low tensile strain level (e.g., 0.1%). According to the reaction heat, microstructures, and chemical composition analyses, strain-hardening ultra-high-performance geopolymer concrete with hybrid activators had the highest reaction degree, while that of Na2CO3-based strain-hardening ultra-high-performance geopolymer concrete was the lowest. It was found that the Na2CO3-based strain-hardening ultra-high-performance geopolymer concrete showed the best sustainability, and the strain-hardening ultra-high-performance geopolymer concrete with hybrid Na2SiO3 and Na2CO3 presented the best overall performance (considering the mechanical performance, energy consumption, environmental impact, and economical potential). The findings of this work provide useful knowledge for improving the sustainability and economic potential of strain-hardening ultra-high-performance geopolymer concrete materials.

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Section: Discussionmentioning

confidence: 99%

Section: Tensile Performance and Cracking Behavior 41 Tensile Perform...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilization of sodium carbonate activator in strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC)

Lao

Huang

et al. 2023

Front. Mater.

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“…In the initial crack development process, the crack grows along the load direction, thus laying the foundation for the subsequent crack penetration in the third stage when the ultimate load is reached, and eventually, brittle fracture and failure of the component [19][20][21]. At this point, the introduction of fibres mainly plays a role in the second and third stages.…”

Section: Resultsmentioning

confidence: 99%

Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

Wang,

Xu,

Zang

et al. 2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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In this study, we will apply the hot-press moulding method for the first time to the preparation of alkali-activated slag composites (AASC) and incorporate 1vol.-%, 3vol.-%, 5vol.-%, and 7vol.-% steel, copper, and carbon fibres into the matrix in order to investigate the characteristics of the HP-AASC and fibre reinforced (HP-FRAASC) in terms of compressive strength, flexural strength, impact toughness, and bulk density of HP-AASC and HP-FRAASC. Results show that the composites have good flexural strength, compressive strength, and impact toughness when the content of steel fibres is 5 vol.-%, copper fibres are 7 vol.-%, and carbon fibres are 1-3 vol.-%. It was observed from each sample of HP-FRAASC and HP-AASC that the HP-AASC samples had lower porosity, better density, and an easy preparation process, which can be used as a suitable preparation method for this material.

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“…Initially, the fly ash was commonly used as the precursor, and heat curing was required to ensure early strength development of the geopolymer. Afterwards, a combination of ground granulated blast-furnace slag (hereafter "slag" for brevity) and fly ash was adopted to achieve balanced strengths at early stages of the geopolymer, which is known as "slag and fly ash based geopolymer" (Ding et al, 2019;Lao et al, 2023bLao et al, , 2023c. Currently, the geopolymer has been employed in the manufacturing of various structural members, including RC beams (Du et al, 2021;Junaid et al, 2020;Maranan et al, 2018Maranan et al, , 2019Pham et al, 2021;Tran et al, 2021;Wu et al, 2020), columns (Ahmad et al, 2021;Raza et al, 2021), slabs (Huang et al, 2023), and precast concrete members (Huang and Dai, 2020;Huang et al, 2022a;Kumar et al, 2021aKumar et al, , 2021b.…”

Section: Introductionmentioning

confidence: 99%

Flexural performance of reinforced concrete beams strengthened with FRP-reinforced geopolymer matrix: Numerical validation and parametric study

Tang,

Peng,

Huang

et al. 2023

Advances in Structural Engineering

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This study investigates the flexural performance of reinforced concrete (RC) beams strengthened by FRP-reinforced geopolymer matrix (FRGM) through a comprehensive numerical analysis. A two-dimensional (2D) finite element (FE) model is developed to simulate the behavior of the FRGM-strengthened RC beams, including the failure modes, load-deflection curves, and interfacial slips. The settings of the FE model, such as material properties, boundary conditions and interfacial bond properties between the FRGM and RC beams, are firstly validated by comparing the predicted results with the existing experimental data from previous publication. Subsequently, a parametric analysis involving 200 specimens is conducted to evaluate the effects of FRGM thickness, sectional area, location and type of the FRP rebar. The results indicate that the uniaxial compressive behaviors of geopolymer mortar and interfacial properties can be accurately described by the parabolic curve and bilinear traction-separation curve, respectively. The failure mode and load-carrying capacity of the specimens are primarily influenced by the axial strength of the reinforced FRP rebar. Additionally, the interfacial slip distributions transform from an inverse tangential shape to a sawtooth shape depending on the cracking pattern of the specimen.

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Strain-hardening alkali-activated fly ash/slag composites with ultra-high compressive strength and ultra-high tensile ductility

Cited by 64 publications

References 112 publications

Utilization of sodium carbonate activator in strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC)

Utilization of sodium carbonate activator in strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC)

Influences on the mechanical and physical properties of hot-press moulding alkali-activated slag (HP-FRAASC) composite with various fibers

Flexural performance of reinforced concrete beams strengthened with FRP-reinforced geopolymer matrix: Numerical validation and parametric study

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