Efeitos da adição de nanocompósito híbrido baseado em hidrogel de polissacarídeo e nanoargila nas propriedades nos estados fresco e endurecido de argamassas cimentícias

Calesco, M. A. F.; Filho, Adhemar Watanuki; Moura, Mônica; Aouada, Fauze A.

doi:10.1590/0366-69132022683853161

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…The hydrogel concentration (0.5% wt./wt. with respect to cement mass) was determined based on the literature [45,51,52]. Note that all hydrogels were presoaked with water for 48 h to ensure that the hydrogel was completely charged with water before it was applied to the mortar.…”

Section: Mortar Preparationmentioning

confidence: 99%

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Filho

Moura

Aouada

2023

Preprint

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Cement-based composites comprise a binder matrix with or without aggregates. Hydration of cement is an exothermic reaction that releases considerable quantities of heat, causes drying shrinkage, and results in cracks that can compromise the performance of the structure. Hydrogels can help mitigate such cracking as their hydrophilic characteristics and 3D crosslinked structure enable them to absorb and directly release water into the cement matrix over time. The aim of this study is to synthesize and analyze the effect of adding hybrid nanocomposite hydrogels with different concentrations (0, 10, and 20% w/v) of Cloisite-Na+ nanoclay in their fresh and hardened cement mortar states. The hydrogels were synthesized via free radical polymerization, and four cementitious mortar samples (M, M0, M10, and M20), were prepared with 1:2.16, 0.40 water/cement and 0.50% presoaked hydrogel (wt./wtcement) ratios. The results demonstrated that the density of all the mortars in the fresh state was ~ 2.16 ± 0.01 g.cm− 3, but a decreasing trend was observed that could attributed to the increase of air incorporation into the mortar. At 28 days, the results indicated that the hydrogel with 20% Cloisite-Na+ was the most efficient, causing a reduction of ~ 4.41% in water absorption by the mortar. For all the three curing conditions considered, all mortars demonstrated considerable shrinkage over time. However, the controlled curing indicated that M20 mortars demonstrated 30.5% less shrinkage compared to the control sample. Thus, the results indicate that the mortars containing hydrogel demonstrate satisfactory behavior in both the fresh and hardened state, highlighting its efficiency as a curing agent.

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Section: Mortar Preparationmentioning

confidence: 99%

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Filho

Moura

Aouada

2023

Preprint

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Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Filho,

de Moura,

Aouada

2024

J Sol-Gel Sci Technol

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Cement-based composites comprise a binder matrix with or without aggregates. Hydration of cement is an exothermic reaction that releases considerable quantities of heat, causes drying shrinkage, and results in cracks that can compromise the performance of the structure. Hydrogels can help mitigate such cracking as their hydrophilic characteristics and 3D crosslinked structure enable them to absorb and directly release water into the cement matrix over time. The aim of this study is to synthesize and analyze the effect of adding hybrid nanocomposite hydrogels with different concentrations (0, 10, and 20% w/v) of Cloisite-Na + nanoclay in their fresh and hardened cement mortar states. The hydrogels were synthesized via free radical polymerization, and four cementitious mortar samples (M, M0, M10, and M20), were prepared with 1:2.16, 0.40 water/cement and 0.50% presoaked hydrogel (wt./wt cement ) ratios.The results demonstrated that the density of all the mortars in the fresh state was ~ 2.16 ± 0.01 g.cm − 3 , but a decreasing trend was observed that could attributed to the increase of air incorporation into the mortar. At 28 days, the results indicated that the hydrogel with 20% Cloisite-Na + was the most e cient, causing a reduction of ~ 4.41% in water absorption by the mortar. For all the three curing conditions considered, all mortars demonstrated considerable shrinkage over time. However, the controlled curing indicated that M20 mortars demonstrated 30.5% less shrinkage compared to the control sample. Thus, the results indicate that the mortars containing hydrogel demonstrate satisfactory behavior in both the fresh and hardened state, highlighting its e ciency as a curing agent.

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State-of-the-Art Nanoclay Reinforcement in Green Polymeric Nanocomposite: From Design to New Opportunities

et al. 2022

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Nanoclays are layered aluminosilicate nanostructures. Depending upon the chemical composition and microscopic structure, various nanoclay types have been discovered such as montmorillonite, bentonite, kaolinite, halloysite nanoclay, etc. Nanoclays have been organically modified to develop compatibility with polymers. Polymer/nanoclay nanocomposites have prompted significant breakthroughs in the field of nanocomposite technology. Green nanocomposites form an important class of nanomaterials using naturally derived degradable materials as matrix/nanofiller. This review essentially deliberates the fundamentals and effect of nanoclay reinforcements in the green polymer matrices. Naturally derived polymers such as cellulose, starch, natural rubber, poly(lactic acid), etc. have been employed in these nanocomposites. Green polymer/nanoclay nanocomposites have been fabricated using various feasible fabrication approaches such as the solution route, melt processing, in situ polymerization, and others. The significance of the structure-property relationships in these nanomaterials, essential to attain the desired features, has been presented. Green polymer/nanoclay nanocomposites are light weight, inexpensiveness, ecofriendly, have a low cost, and enhanced indispensable physical properties. Consequently, the green polymer/nanoclay nanocomposites have found applications towards sustainability uses, packaging, membranes, and biomedical (tissue engineering, drug delivery, wound healing) sectors. However, thorough research efforts are desirable to extend the utility of the green polymer/nanoclay nanocomposites in future technological sectors.

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Efeitos da adição de nanocompósito híbrido baseado em hidrogel de polissacarídeo e nanoargila nas propriedades nos estados fresco e endurecido de argamassas cimentícias

Cited by 3 publications

References 45 publications

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

State-of-the-Art Nanoclay Reinforcement in Green Polymeric Nanocomposite: From Design to New Opportunities

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