Development of hydrophobicity in geopolymer composites-Progress and perspectives

Sidhu, Japneet; Kumar, Pardeep

doi:10.1016/j.conbuildmat.2023.132344

Cited by 14 publications

(2 citation statements)

References 59 publications

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“…The study suggests that the hydrophobic nature of MMK enhances sulfate resistance by reducing the capillarity of pores and limiting sulfate ion ingress into the mortar matrix, ultimately improving the structural integrity of the material against sulfate attack. In the study by Sidhu et al [110] on hydrophobicity in geopolymer composites, various mechanical property outcomes were observed. Incorporating PDMS resulted in a rise in compressive strength from 19.4 MPa to 26.2 MPa as the PDMS content increased up to 5%, while tensile strain capacity decreased from 6.4% to 3.9%, as shown in figure 22.…”

Section: Sulfate Expansion Reduced By 50% [55]mentioning

confidence: 99%

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Gnanaraj S,

2024

Eng. Res. Express

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Corrosion in concrete structures constitutes significant challenges, threatening integrity and requiring high maintenance costs. Hydrophobic concrete presents an emerging solution for addressing corrosion in concrete structures, especially in marine environments. This review article investigates advanced techniques for surface and bulk modifications of hydrophobic concrete, focusing on their efficacy in enhancing corrosion resistance. Surface modifications using silane-siloxane coatings and polyurethane treatments significantly reduce water absorption by up to 30% and chloride ion permeability by up to 50%. Bulk modifications incorporating nano-silica and calcium stearate demonstrate marked improvements in mechanical properties and corrosion resistance, with calcium stearate reducing corrosion rates by 40%. These treatments also contribute to an average increase in compressive strength of 15% and a decrease in corrosion current densities, indicating practical utility in environments such as marine conditions. Additionally, innovative techniques like fluorosilane treatments and steel fibres further fortify impermeability and structural integrity, demonstrating the versatility of hydrophobic concrete in addressing corrosion challenges. Moreover, using eco-friendly ingredients underscores its potential for sustainable infrastructure development. In summary, hydrophobic concrete offers a comprehensive strategy for combating corrosion, providing surface and bulk modifications that enhance durability, reduce maintenance costs, and ensure the long-term sustainability of modern infrastructure.

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Section: Sulfate Expansion Reduced By 50% [55]mentioning

confidence: 99%

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Gnanaraj S,

2024

Eng. Res. Express

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“…This is because geopolymerization produces a denser microstructure with reduced porosity, which limits the ingress of water and other harmful substances [40]. The sorptivity test can be used as a tool to assess the durability and resistance of GPC to various environmental conditions, such as freeze-thaw cycles, chemical attack, and moisture exposure [41]. A lower sorptivity indicates better resistance to these factors and, hence, longer service life [42].…”

Section: Sorptivitymentioning

confidence: 99%

Residual Properties of Geopolymer Concrete for Post-Fire Evaluation of Structures

Kanagaraj,

Anand,

Andrushia

et al. 2023

Materials

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The research focuses on effectively utilizing industrial by-products, namely fly ash (FA) and ground granulated blast furnace slag (GGBS), to develop sustainable construction materials that can help reduce carbon emissions in the construction industry. Geopolymer mix design using these by-products is identified as a potential solution. The study investigates the impact of different water to binder ratios (W/B) ranging from 0.4 to 0.6 on the residual properties, including compressive strength (CS), of geopolymer concrete (GPC), in accordance with Indian Standard for Alkali activated concrete. Lower W/B ratios were found to result in a more compact and less porous microstructure in the GPC. Additionally, the research explores the post-fire performance of GPC with varying grades (M10, M20, M30, & M40) and different W/B ratios, following the ISO 834 standard fire curve. It was observed that concrete samples exposed to elevated temperatures displayed a more porous microstructure. The mass loss of GPC with 0.4 W/B was found to be 2.3–5.9% and for 0.6 W/B ratio, the loss was found to be 3–6.5%, after exposing to 30-, 60-, 90-, and 120-min of heating. In the case of strength loss, for 0.4 W/B ratio, the loss was 36.81–77.09%, and for 0.6 W/B ratio the loss was 38.3–100%, after exposing to 30-, 60-, 90-, and 120-min of heating. Overall, the findings suggest that optimizing the W/B ratio in geopolymer concrete can enhance its compressive strength, as well as residual properties, and contribute to its suitability as a sustainable construction material. However, the response to elevated temperatures should also be considered to ensure its performance in fire scenarios.

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Investigation on in‐situ geopolymer coatings: A comparative analysis of lycopodium powder and polydimethylsiloxane as functional additives

Krishna,

Prasad,

Sethy

et al. 2025

Structural Concrete

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Geopolymer‐based inorganic coatings provide an effective alternative to conventional chemical‐based solutions. However, the coatings are not universally applicable, especially in critical applications such as underwater. This research aims to investigate and enhance geopolymer‐based coating through specific utilization of functional additives such as reduced graphene oxide (rGO), lycopodium powder (LCP), and polydimethylsiloxane (PDMS) for underwater applications. These additives were incorporated in limited dosages (<3 wt.% of binder), and their potential is further assessed in improving the coating material in terms of the resulting water resistance, mechanical properties, and durability against NaCl, MgSO4, HNO3, and H2SO4 attacks. The introduction of rGO facilitated a 35% increase in the 28‐day compressive strength and 33.83% in the scratch hardness, whereas (rGO + LCP) improved the water contact angle by 125%. Additionally, the developed coatings were further analyzed using an optical microscope and x‐ray diffractometer to understand their bonding potential with steel or cementitious substrates and phase formation. Life cycle cost analysis was also conducted to evaluate the economic viability of the geopolymer coatings, revealing a potential cost reduction of approximately 16%–42% with the sourcing of locally available materials.

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Development of hydrophobicity in geopolymer composites-Progress and perspectives

Cited by 14 publications

References 59 publications

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Residual Properties of Geopolymer Concrete for Post-Fire Evaluation of Structures

Investigation on in‐situ geopolymer coatings: A comparative analysis of lycopodium powder and polydimethylsiloxane as functional additives

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