High-strength high-ductility Engineered/Strain-Hardening Cementitious Composites (ECC/SHCC) incorporating geopolymer fine aggregates

Xu, Ling-Yu; Huang, Bo-Tao; Li, Victor C.; Dai, Jian‐Guo

doi:10.1016/j.cemconcomp.2021.104296

Cited by 109 publications

(18 citation statements)

References 65 publications

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“…These results are consistent with other studies, such as the works by Xu et al [ 93 ] and Qian et al [ 94 ]. In both works, the authors evaluated the use of geopolymer fine aggregates to produce geopolymer materials.…”

Section: Ra From Other Wastessupporting

confidence: 94%

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

et al. 2022

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Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, polyethylene terephthalate (PET), glass, and slag. Furthermore, around 32 bi tons of natural aggregate (NA) are extracted annually. In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw the main challenges and outlook. RA reduces concrete’s fresh and hardened performance compared to NA, but these reductions are often negligible when the replacement levels are kept up to 30%. Furthermore, we point out efficient strategies to mitigate these performance reductions. Efforts must be spent on improving the efficiency of RA processing and the international standardization of RA.

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Section: Ra From Other Wastessupporting

confidence: 94%

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

et al. 2022

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“…The strength of artificial lightweight concrete increased as a solid cement matrix was produced by creating a C-S-H gel around the artificial aggregate, which increased the density of the ITZ as being reported by Kwek et al [ 13 ] in which is depicted as in Figure 3 . Moreover, in other study, the geopolymer aggregate/matrix ITZ appeared to be wider (about 7 µm), and the microhardness value increased as the geopolymer aggregate successfully formed a strong chemical connection with the cementitious matrix and might be regarded as “additional defects” in the high-strength matrix [ 97 ].…”

Section: Interfacial Transition Zone (Itz)mentioning

confidence: 99%

Geopolymer-Based Artificial Aggregates: A Review on Methods of Producing, Properties, and Improving Techniques

et al. 2022

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The depletion of aggregate-related natural resources is the primary concern of all researchers globally. Recent studies emphasize the significance of recycling and reusing various types of natural or by-product material waste from industry as a result of the building industry’s rising demand for aggregate as the primary component in concrete production. It has been demonstrated that the geopolymer system has exceptional features, such as high strength, superior durability, and greater resistance to fire exposure, making it a viable alternative to ordinary Portland Cement (OPC) concrete. This study will examine the present method utilized to generate artificial aggregate-based geopolymers, including their physical and mechanical properties, as well as their characterization. The production process of geopolymer derived from synthetic aggregates will be highlighted. In conjunction with the bonding of aggregates and the cement matrix, the interfacial transition zone (ITZ) is highlighted in this work as an additional important property to be researched in the future. It will be discussed how to improve the properties of geopolymers based on artificial aggregates. It has been demonstrated that cold bonding provides superior qualities for artificial aggregate while conserving energy during production. The creation of ITZ has a significant impact on the bonding strength between artificial aggregates and the cement matrix. Additionally, improvement strategies demonstrate viable methods for enhancing the quality of manufactured aggregates. In addition, other recommendations are discussed in this study for future work.

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“…This behavior of the material under tension is achieved by fulfilling a number of micromechanical conditions for the formation of microcracks, their propagation and overlap with fibers [13][14][15]. This cement composite can be used not only as the main material in structures but also as thin reinforcing layers for repairing and strengthening the existing 2 of 22 structures taking into consideration its high deformation ability [16][17][18][19]. Another advantage of these composites is the use of secondary mineral resources, such as microsilica, slag, fly ash, ground rocks, or stone dust [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Smirnova

Pidal²,

Alekseev³

et al. 2022

Materials

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A comparative study of the fracture features, strength and deformation properties of pseudo strain-hardening composites based on alkali-activated slag and Portland cement matrices with polypropylene microfiber was carried out. Correlations between their compositions and characteristics of stress–strain diagrams under tension in bending with an additional determination of acoustic emission parameters were determined. An average strength alkali-activated slag matrix with compressive strength of 40 MPa and a high-strength Portland cement matrix with compressive strength of 70 MPa were used. The matrix compositions were selected for high filling the composites with polypropylene microfiber in the amount of 5%-vol. and 3.5%-vol. ensuring the workability at the low water-to-binder ratios of 0.22 and 0.3 for Portland cement and alkali-activated slag matrices, respectively. Deformation diagrams were obtained for all studied compositions. Peaks in the number of acoustic signals in alkali-activated slag composites were observed only in the strain-softening zone. Graphs of dependence of the rate of acoustic events occurrence in samples from the start of the test experimentally prove that this method of non-destructive testing can be used to monitor structures based on strain-hardening composites.

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High-strength high-ductility Engineered/Strain-Hardening Cementitious Composites (ECC/SHCC) incorporating geopolymer fine aggregates

Cited by 109 publications

References 65 publications

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

Geopolymer-Based Artificial Aggregates: A Review on Methods of Producing, Properties, and Improving Techniques

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

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