Characteristics of underwater cast and cured geopolymers

Ge, Xiaonan; Duran, Lindsay; Tao, Mingjiang; DeGroot, Don J.; Li, Emily; Zhang, Guoping

doi:10.1016/j.cemconcomp.2020.103783

Cited by 23 publications

(2 citation statements)

References 41 publications

(58 reference statements)

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“…Fourier-transform infrared spectroscopy (FTIR) of geopolymer was performed in KBr pellets in a Cary 600 Series FTIR Spectrometer (Agilent, Santa Clara, CA, USA), with an analysis range of 500 to 4000 cm −1 , resolution of 8 cm −1 , and 64 accumulations. For microstructural analyses, the samples were immersed in isopropanol [ 42 , 43 ] and ground until a size ≤45 µm.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

et al. 2022

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Despite geopolymers having emerged as a more sustainable alternative to Portland cement, their rheological properties still need to be thoroughly investigated, aiming at the material’s applicability. Additionally, studies that evaluated the fresh state of geopolymer composites with nanomaterials are scarce. Thus, two metakaolin-based geopolymer systems were reinforced with nanomaterials with a similar geometry: carbon nanotubes (CNT) and silicon carbide whiskers (SCW). The nanomaterials incorporation was assessed by rotational rheometry (conducted up to 110 min), isothermal calorimetry, compressive strength after 7 and 28 days, and the microstructure was investigated using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). CNT and SCW incorporation (0.20 wt.%) did not significantly affect the yield stress and viscosity of the R2-group (based on metakaolin type 2), while increasing the rheological parameters up to 56.0% for the R1-group (based on metakaolin type 1). Both additions modified the reaction kinetics. Increments of up to 40.7% were observed in the compressive strength of geopolymer pastes with the incorporation of a SCW content of 0.2 wt.%. XRD and FTIR results suggest similar structural modifications between precursors. Nevertheless, R2 showed substantial transformations while the R1 group exhibited anhydrous material that can react over time. Overall, incorporating CNT and SCW contributed to higher mechanical increments on systems with average mechanical strength (R1) compared to systems with higher potential mechanical performance (R2).

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Section: Methodsmentioning

confidence: 99%

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

et al. 2022

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“…The suitability of these materials owes to the wide range of industrial by-products that can be employed as binders: fly ash (FA), microsilica (MS), metakaolin (MK) and ground granulated blast-furnace slag (GGBS), among others [3]. Geopolymers can not only act as a sustainable replacement for conventional concrete but also demonstrate high compressive strengths [4], excellent fireproofing [5], and enhanced durability [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Fresh Properties of Multi-Binder Geopolymer Mortars Incorporating Recycled Rubber Particles

Abdelmonim

Bompa

2021

Infrastructures

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This paper examines the performance of multi-binder conventional geopolymer mixes (GCMs) with relatively high early strength, achieved through curing at ambient temperature. Mixes incorporating ground granulated blast-furnace slag (GGBS), fly ash (FA) and microsilica (MS) and sodium metasilicate anhydrous, were assessed in terms of workability, mechanical properties and embodied carbon. A cement mortar was also prepared for the sake of comparison. The best performing GCM was then used as a reference for rubberised geopolymer mixes (RuGM) in which the mineral aggregates were replaced by recycled rubber particles in proportions up to 30% by volume. Experimental results were combined with embodied carbon estimations in a multi-criteria assessment to evaluate the performance of each material. A mix with a 75/25 GGBS-to-FA ratio, in which 5% MS was added, had the best performance in terms of strength, workability, water absorption and environmental impact. The compressive strength was above 50 MPa, similar to that of the cement mortar. The latter had significantly higher embodied carbon, with factors ranging between 3.48 to 4.20, compared with the CGM mixes. The presence of rubber particles reduced the mechanical properties of RuGM proportionally with the rubber amount, but had similar workability and embodied carbon to CGMs. Finally, a strength degradation model is validated against the tests from this paper and literature to estimate the compressive strength of RuGM, providing reliable predictions over a wide range of rubber contents.

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The effect of different types of class F fly ashes on the mechanical properties of geopolymers cured at ambient environment

Xiang

Shi

2022

Cement and Concrete Composites

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Characteristics of underwater cast and cured geopolymers

Cited by 23 publications

References 41 publications

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

Evaluation of CNTs and SiC Whiskers Effect on the Rheology and Mechanical Performance of Metakaolin-Based Geopolymers

Mechanical and Fresh Properties of Multi-Binder Geopolymer Mortars Incorporating Recycled Rubber Particles

The effect of different types of class F fly ashes on the mechanical properties of geopolymers cured at ambient environment

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