Extremely-ductile alkali-activated slag-based composite with a tensile strain capacity up to 22%

Lương, Quang-Hiếu; Nguyễn, Huy Hoàng; Nguyễn, Phương Hoàng; Kang, Su-Tae; Lee, Bang Yeon

doi:10.1016/j.ceramint.2022.12.057

Cited by 16 publications

(2 citation statements)

References 28 publications

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“…When subjected to cracked conditions, the internal steel fibers in UHPC are prone to corrosion from aggressive media, which can weaken its mechanical properties. On the other hand, ECC is a highly ductile fiber-reinforced concrete with excellent deformability and crack control capabilities, which typically exhibits tensile strains of over 3% [9][10][11], and can effectively enhance the durability and seismic performance of structural elements [12,13]. Researchers have conducted extensive studies to develop high-performance concrete that combines both ultra-high strength and exceptional tensile properties [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Zhuo,

Chen,

Luo

et al. 2024

Buildings

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The application of alkali-activated concrete (AAC) shows promise in reducing carbon emissions within the construction industry. However, the pursuit of enhanced performance of AAC has led to a notable increase in carbon emissions, with alkali activators identified as the primary contributors. In an effort to mitigate carbon emissions, this study introduces Na2CO3 as a supplementary activator, partially replacing sodium silicate. The objective is to develop a low-carbon alkali-activated-strain-hardening-ultra-high-performance concrete (ASUHPC). The experimental investigation explores the impact of varying levels of Na2CO3 replacement quantity (0, 0.75 Na2O%, and 1.5 Na2O%) and activator modulus (1.35, 1.5, and 1.65) on the fresh and hardened properties of ASUHPC. The augmentation of Na2CO3 replacement quantity and activator modulus are observed to extend the setting time of the paste, indicating an increase in the modulus of the activator and Na2CO3 replacement quantity would delay the setting time. While the use of Na2CO3 intensifies clustering in the fresh paste, it optimizes particle grading, resulting in higher compressive strength of ASUHPC. The tensile crack width of ASUHPC conforms to the Weibull distribution. ASUHPC with a Na2CO3 replacement quantity of 0.75 Na2O% exhibits superior crack control capabilities, maintaining a mean crack width during tension below 65.78 μm. The tensile properties of ASUHPC exhibit improvement with increasing Na2CO3 replacement quantity and activator modulus, achieving a tensile strength exceeding 9 MPa; otherwise, increasing the activator modulus to 1.5 improves the deformation capacity, reaching 8.58%. Moreover, it is observed that incorporating Na2CO3 as a supplementary activator reduces the carbon emissions of ASUHPC. After considering the tensile performance indicators, increasing the activator modulus can significantly improve environmental performance. The outcomes of this study establish a theoretical foundation for the design of low-carbon, high-performance-alkali-activated-strain-hardening-ultra—high-performance concrete.

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Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Zhuo,

Chen,

Luo

et al. 2024

Buildings

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“…The engineering geopolymer composite (EGC) is a low-carbon composite made of geopolymer gel, various aggregates, and short fiber [14][15][16][17][18]. The EGC, similar to the ECC, also has excellent tensile properties, with tensile strengths of up to 10 MPa and tensile strains of up to 3-22%, which are accompanied by strain-hardening behaviors and multiseam spreading and have attracted a great deal of interest from researchers [17,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Axial Impact Resistance of High-Strength Engineering Geopolymer Composites: Effect of Polyethylene Fiber Content and Strain Rate

Ling,

Zhang,

Zou

et al. 2024

Buildings

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High-strength engineered geopolymer composite (EGC) materials exhibit excellent mechanical properties under quasistatic loading, thus showing great potential in military and civilian facilities subjected to impact or explosive loading. However, its dynamic mechanical response under high-speed loading is not fully understood. In this study, dynamic compressive test was performed on EGC with PE fiber contents of 0%, 0.5%, 1.0%, 1.5%, and 2.0% using the Split Hopkinson Pressure Bar (SHPB) test. The results indicated that EGC reinforced with 1.5% fiber exhibited optimal static and dynamic mechanical performance. In the strain rate range of 181 s−1 to 201 s−1, when the fiber content increased from 1.0% to 1.5% and 2.0%, the dynamic compressive strength of the EGC increased by 24.3%, 28.8%, and 44.0%, respectively, compared to the matrix without fiber. Dynamic parameters of the EGC, including dynamic compressive strength, dynamic increase factor, and impact toughness, showed sensitivity to strain rates and increased with strain rate. A modified model, incorporating the fiber bridging effect, was proposed based on the CEB-FIP model, providing important guidance for practical engineering applications.

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Mechanical and autogenous healing properties of high-strength and ultra-ductility engineered geopolymer composites reinforced by PE-PVA hybrid fibers

Nguyễn,

Lương

et al. 2023

Cement and Concrete Composites

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Extremely-ductile alkali-activated slag-based composite with a tensile strain capacity up to 22%

Cited by 16 publications

References 28 publications

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Axial Impact Resistance of High-Strength Engineering Geopolymer Composites: Effect of Polyethylene Fiber Content and Strain Rate

Mechanical and autogenous healing properties of high-strength and ultra-ductility engineered geopolymer composites reinforced by PE-PVA hybrid fibers

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