Investigation of the compressive self-sensing response of filler-free metakaolin geopolymer binders and coatings

Vlachakis, Christos; Al‐Tabbaa, Abir

doi:10.1016/j.conbuildmat.2023.131682

Cited by 7 publications

(2 citation statements)

References 58 publications

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“…Cement-based sensing coatings, on the other hand, boast a simpler installation process and can operate with cost-effective electrical devices. Moreover, these coatings achieve a greater interaction with the substrate as well as higher flexibility in monitoring as they are capable of pivoting from strain-sensing [97] to damage-sensing and tomography applications [98]. Lastly, beyond their sensing capabilities, cementitious coatings can also serve as an effective retrofitting solution for structural or non-structural repairs [99].…”

Section: Coating Applicationsmentioning

confidence: 99%

Strain Monitoring of Concrete Using Carbon Black-Based Smart Coatings

Milone,

Vlachakis,

Tulliani

et al. 2024

Materials

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Given the challenges we face of an ageing infrastructure and insufficient maintenance, there is a critical shift towards preventive and predictive maintenance in construction. Self-sensing cement-based materials have drawn interest in this sector due to their high monitoring performance and durability compared to electronic sensors. While bulk applications have been well-discussed within this field, several challenges exist in their implementation for practical applications, such as poor workability and high manufacturing costs at larger volumes. This paper discusses the development of smart carbon-based cementitious coatings for strain monitoring of concrete substrates under flexural loading. This work presents a physical, electrical, and electromechanical investigation of sensing coatings with varying carbon black (CB) concentrations along with the geometric optimisation of the sensor design. The optimal strain-sensing performance, 55.5 ± 2.7, was obtained for coatings with 2 wt% of conductive filler, 3 mm thickness, and a gauge length of 60 mm. The results demonstrate the potential of applying smart coatings with carbon black addition for concrete strain monitoring.

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Section: Coating Applicationsmentioning

confidence: 99%

Strain Monitoring of Concrete Using Carbon Black-Based Smart Coatings

Milone,

Vlachakis,

Tulliani

et al. 2024

Materials

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“…Geopolymers are typically produced from aluminosilicate-rich raw materials [20]. Currently, the most commonly used raw materials in geopolymers are fly ash [21][22][23], blast furnace slags [24][25][26], or metakaolin [27,28]. Fly ash and slag are finished wastes from energy processes for use in geopolymerization.…”

Section: Introductionmentioning

confidence: 99%

Application of Industrial Waste Materials by Alkaline Activation for Use as Geopolymer Binders

Setlak,

Mikuła,

Łach

2023

Materials

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The purpose of this study is to synthesize geopolymer binders as an environmentally friendly alternative to conventional cement using available local raw materials. Waste materials such as chalcedonite (Ch), amphibolite (A), fly ash from lignite combustion (PB), and diatomite dust (D) calcined at 900 °C were used to produce geopolymer binders. Metakaolin (M) was used as an additional modifier for binders based on waste materials. The base materials were subjected to fluorescence X-ray fluorescence (XRF) analysis and X-ray diffractometry (XRD) to determine chemical and phase composition. A laser particle size analysis was also performed. The various mixtures of raw materials were activated with a 10 M solution of NaOH and sodium water glass and then annealed for 24 h at 60 °C. The produced geopolymer binders were conditioned for 28 days under laboratory conditions and then subjected to microstructural analysis (SEM) and flexural and compressive strength tests. The best compressive strength results were obtained by the Ch + PB samples—more than 57 MPa, while the lowest results were obtained by the Ch + D+A + M samples—more than 20 MPa. On the other hand, as a result of the flexural strength tests, the highest flexural results were obtained by D + A + M + PB binders—more than 12 MPa, and the lowest values were obtained by binders based on Ch + D+A + M—about 4.8 MPa.

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