Microstructure and mechanical properties of carbon microfiber reinforced geopolymers at elevated temperatures

Behera, Promoda; Baheti, Vijay; Militký, Jiřı́; Naeem, Salman

doi:10.1016/j.conbuildmat.2017.11.109

Cited by 66 publications

(19 citation statements)

References 51 publications

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“…The increase of GGBS in the mixes resulting in the increase of the peak intensity of C-S-H indicated that there is an increase in the formation of calcium silicate hydrate. C was noticed due to the evaporation of free water [13]. Above 200 o C, a slow-rate continuous mass loss was observed.…”

Section: Characterizations and Measurementsmentioning

confidence: 95%

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Microstructure and mechanical properties of FA/GGBS-based geopolymer

2018

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Abstract. This study presents the microstructure and mechanical properties of geopolymer paste made from low-calcium fly ash (FA) and ground granulated blast-furnace slag (GGBS) through alkalination. The use of GGBS and FA is not only for sustainable construction but also for reducing the emission of CO2 due to the use of Portland cement. Different replacement ratios of GGBS to FA were used to determine the effect of GGBS presented to the compressive strength of geopolymer specimens. The alkaline activator solution used is a combination of sodium hydroxide (NaOH) 14 M and sodium silicate (Na2SiO3). A compressive strength test on cylindrical specimens (50 mm x 100 mm) at the ages of 7, 14, and 28 days was carried out. The results showed that the compressive strength increased with the increase of GGBS in the mixes (up to 100 MPa). Moreover, SEM-EDS, XRD, and TG-DTA characterization methods were conducted to investigate the microstructure, phase composition, and thermal stability of the geopolymer specimens respectively.

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Section: Characterizations and Measurementsmentioning

confidence: 95%

“…Above 200 o C, a slow-rate continuous mass loss was observed. In this stage, the mass loss is attributed to the dehydroxylation of the chemically bound water [13]. The specimen containing 60% GGBS featured the lowest thermal stability.…”

Section: Characterizations and Measurementsmentioning

confidence: 99%

Microstructure and mechanical properties of FA/GGBS-based geopolymer

2018

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“…Cases have also been reported in which the filler is sonicated but added to the mix at a later stage, particularly after the alkaline solution and the precursor have been mixed together [58,59]. However, the recommended process is to disperse the fillers in the alkaline solution (prior to mixing with the solid precursor), as this has been reported to lead to greater dispersion and uniform density in the matrix and therefore leading to increased electrical performance [50,58,60].…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, Behera et al [59] added over 10% by volume carbon microfibre to metakaolin AAM, and found conductivity only increased from 10 −3 S/m to 10 −2 S/m.…”

mentioning

confidence: 98%

“…The addition of conductive filler does, however, provide other important benefits: when added in appropriate quantities they can significantly enhance the mechanical properties of the composites [54,59,[107][108][109]. One of their only major downsides is that they increase cost, and the additional costs can be significant when scaled to the volumes of material required in a civil engineering context.…”

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confidence: 99%

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Self-Sensing Alkali-Activated Materials: A Review

2020

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Alkali-activated materials are an emerging technology that can serve as an alternative solution to ordinary Portland cement. Due to their alkaline nature, these materials are inherently more electrically conductive than ordinary Portland cement, and have therefore seen numerous applications as sensors and self-sensing materials. This review outlines the current state-of-the-art in strain, temperature and moisture sensors that have been developed using alkali activated materials. Sensor fabrication methods, electrical conductivity mechanisms, and comparisons with self-sensing ordinary Portland cements are all outlined to highlight best practice and propose future directions for research.

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Physical and mechanical properties of fly ash‐based geopolymer with disposable medical mask reinforcement

Zhang,

Li,

Shen

et al. 2023

J of Applied Polymer Sci

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A tremendous amount of the nonbiodegradable microplastic waste has been generated after the outbreak of COVID‐19 by the widespread use of single‐use personal protective equipment, especially disposable medical masks (DMMs). This has caused harm to the health and safety of human beings and various organisms. Finding a way to properly deal with these single‐use medical wastes has become an urgent problem. In this paper, an innovative way was explored to use DMMs in geopolymer (GP). The physical properties, mechanical strength, and resistance to high temperatures (200–800°C) of the composites were investigated. The findings of the study revealed that DMMs had negligible influence on resistance to high temperatures, but showed a positive influence on enhancing the compressive and flexural strengths of GPs at ambient temperature. The optimum DMMs content was 0.4 wt%, at which the compressive and flexural strengths of the GP composites were enhanced by 5.8% and 22.68% compared with the pure GP, respectively. The same polypropylene (PP) fiber amount increased compressive and flexural strengths by 7.49% and 9.76%, respectively. This thus confirmed that DMMs can be sustainably utilized in green building materials, playing a role as PP fibers toughening and contributing to the effective management of waste plastics.

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Microstructure and mechanical properties of carbon microfiber reinforced geopolymers at elevated temperatures

Cited by 66 publications

References 51 publications

Microstructure and mechanical properties of FA/GGBS-based geopolymer

Microstructure and mechanical properties of FA/GGBS-based geopolymer

Self-Sensing Alkali-Activated Materials: A Review

Physical and mechanical properties of fly ash‐based geopolymer with disposable medical mask reinforcement

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