Effect of calcium ion (cross-linker) concentration on porosity, surface morphology and thermal behavior of calcium alginates prepared from algae (Undaria pinnatifida)

Pathak, Tara Sankar; Yun, Jung‐Ho; Lee, Joon-Bae; Paeng, Ki‐Jung

doi:10.1016/j.carbpol.2010.03.025

Cited by 60 publications

(44 citation statements)

References 36 publications

(33 reference statements)

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“…Similarly, the alginate found in the seaweed extract, reacts with calcium ions to form spheres of calcium alginate ( Figure 9). Other studies have shown similar morphology of the calcium alginate spheres (19). Furthermore, the type of curing had no significant effect.…”

Section: Compressive Strengthmentioning

confidence: 50%

“…At 120 days of age, the values of the charge passed in the control sample, in accordance with the ASTM C 1202 standard, correspond to moderate chloride permeability concrete, whereas concretes containing organic admixtures correspond to low permeability concretes. In general, the trend seems to follow the permeable porosity (Figure 8b), which was affected by the possible formation of complexes of calcium and the reduction of the size of calcium hydroxide crystals (11) as well as by the formation of small spheres of calcium alginate ( Figure 9) when the seaweed extract containing alginic acid reacts with calcium ions (19), thus reducing the permeable porosity.…”

Section: Rapid Chloride Permeabilitymentioning

confidence: 98%

“…In the case of mixes moist-cured for 28 days, those containing only seaweed extract showed carbonation. This could be because the alginate in the seaweed extract forms insoluble chemical compounds with divalent ions such as Ca 2+ (19). This reduces the availability of Ca(OH) 2 necessary for the formation of CaCO 3, allowing for the increased penetration of CO 2. In concrete with a w/c ratio of 0.60 ( Figure 14b) and moist-cured for 0 days, the highest reduction in the carbonation front was obtained in mixes containing cactus mucilage and those containing a combination of cactus mucilage and seaweed extract.…”

Section: Accelerated Chloride Ion Diffusionmentioning

confidence: 99%

“…Alginate is a polysaccharide composed of a binary nonbranched co-polymer from mannuronic (M) and α-L guluronic (G) acids (16,17). These hydrocolloids have the capacity to gel through interaction with carboxylic groups and divalent ions (18,19). A seaweed extract containing sodium alginate has been used, along with sheep wool, as a soil stabilizer in the elaboration of a sustainable composite for the construction industry (20).…”

Section: Introductionmentioning

confidence: 99%

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Influence of cactus mucilage and marine brown algae extract on the compressive strength and durability of concrete

Hernández¹,

Cano-Barrita²,

Torres-Acosta³

2016

Mater. construcc.

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This paper presents the mechanical performance and durability of concrete with water/cement (w/c) ratios of 0.30 and 0.60 containing cactus mucilage and brown marine seaweed extract solutions (at 0.5° Brix concentrations). Cylindrical specimens (100 mm×200 mm) were cast and moist-cured for 0 and 28 days. Compressive strength, rapid chloride permeability, and chloride diffusion tests were conducted to evaluate all of the concrete mixes at the ages of 60 and 120 days. In addition, accelerated carbonation tests were carried out on specimens at the age of 180 days by exposure to 23 °C, 60% RH and at 4.4% CO 2 for 120 days. The compressive strength results showed that only one concrete mix with admixtures increased in strength compared to the control. Regarding the rapid chloride permeability, chloride diffusion and carbonation, the results indicated that the durability of concretes containing organic additions was enhanced compared to the control. RESUMEN: Influencia del mucílago de cactus y extracto de algas pardas marinas en la resistencia a compresión y durabilidad del hormigón.Este trabajo presenta el comportamiento mecánico y de durabilidad de concretos con relaciones agua/cemento de 0.30 y 0.60, conteniendo soluciones de mucílago de nopal y extracto de algas marinas cafés (0.5 °Brix de concentración). Especímenes cilíndricos (100 mm×200 mm) fueron elaborados y curados en húmedo por 0 y 28 días. Se evaluó la resistencia a la compresión, permeabilidad rápida y difusión de cloruros a los 60 y 120 días de edad. Adicionalmente, se realizaron pruebas de carbonatación acelerada en especímenes con 180 días de edad, expuestos a 23 °C, 60% HR y 4.4% de CO 2 por 120 días. Los resultados de resistencia a la compresión muestran que únicamente una mezcla de concreto con adición orgánica incrementó su resistencia con respecto al control. Con respecto a la permeabilidad rápida a cloruros, difusión de cloruros y carbonatación, los resultados indican que la durabilidad de los concretos que contenían adiciones orgánicas fue mejorada con respecto al control.

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Section: Compressive Strengthmentioning

confidence: 50%

Section: Rapid Chloride Permeabilitymentioning

confidence: 98%

Section: Accelerated Chloride Ion Diffusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of cactus mucilage and marine brown algae extract on the compressive strength and durability of concrete

Hernández¹,

Cano-Barrita²,

Torres-Acosta³

2016

Mater. construcc.

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“…Para el caso de las pastas conteniendo extracto de algas (Figura 1c), el incremento del grado de hidratación observado a los 28 días de edad, puede deberse principalmente a su tendencia a formar geles con los iones de calcio presentes en las pastas de cemento (Pathak et al, 2010). A pesar de esta capacidad de formar geles, el efecto de curado interno observado fue diferente al observado en las pastas que contenían mucílago de nopal.…”

Section: Resultados Y Discusiónunclassified

Influencia Del Mucílago De Nopal Y Extracto De Algas Cafés en El Grado De Hidratación De Pastas De Cemento Portland Ordinario

Hernández¹,

Perea²,

Cano-Barrita³

2018

Nexo Revista Científica

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RESUMENEste trabajo presenta el efecto que produce la adición de dispersión acuosa de mucílago de nopal y el extracto de algas marinas cafés en el grado de hidratación de pastas de cemento Portland ordinario. Se elaboraron pastas de cemento con relaciones agua/cemento de 0.30 y 0.60, conteniendo los aditivos naturales en tres concentraciones. Las pastas se curaron en húmedo y selladas. Se determinó el grado de hidratación de las pastas ignición y análisis termo-gravimétrico a los 14, 28 y 56 días de edad. Los resultados indican un mayor grado de hidratación en las pastas de cemento con relación agua/cemento de 0.60 conteniendo los aditivos naturales en comparación con el control. Se sugiere que esto es debido a una mejor dispersión de las partículas de cemento en la presencia de estos aditivos y a la capacidad de estos para retener agua, con lo cual se produce curado interno.Palabras claves: Mucílago de nopal; Extracto de algas cafés; Grado de hidratación; Análisis termogravimétrico. ABSTRACTThis paper presents the effect produced by the addition of aqueous dispersions of cactus mucilage and brown seaweed extract on the degree of hydration of ordinary Portland cement pastes. Cement pastes with water/cement ratios of 0.30 and 0.60 were prepared containing the natural additives at three concentrations. The curing conditions were moist cured and sealed. The degree of hydration was determined by ignition and thermo-gravimetric analysis at 14, 28 and 56 days of age. The results indicate a higher degree of hydration in pastes with a water/cement ratio of 0.60 containing the natural additives with respect to control specimens. This effect could be explained by a better dispersion of cement particles in the presence of the natural additives and their capacity to retain water, thereby providing internal curing.

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Polysaccharides derived from tragacanth as biocompatible polymers and Gels

Fattahi

Petrini

Munarin

et al. 2013

J of Applied Polymer Sci

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Tragacanth gum (TG) is a natural gum whose biomedical applications are limited because of the low water solubility and the possibility to form only weak water-insoluble gels. An innovative method to produce water-soluble tragacanth (WST) is assessed in this work. WST structural characterization indicates a high-molecular weight polyuronic acid, which can undergo gelling by ionotropic complexation. Biological characterization shows no cytotoxicity on Hela, HepG2, and L929 cell lines. Furthermore, TG-based and WST-based gel beads prepared by ionic crosslinking with ferric and zinc ions are studied. Ferric WST gels exerted better cell adhesion with L929 cells than ferric alginate gels. These characteristics make WST a promising candidate for tissue engineering and drug delivery application

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Effect of calcium ion (cross-linker) concentration on porosity, surface morphology and thermal behavior of calcium alginates prepared from algae (Undaria pinnatifida)

Cited by 60 publications

References 36 publications

Influence of cactus mucilage and marine brown algae extract on the compressive strength and durability of concrete

Influence of cactus mucilage and marine brown algae extract on the compressive strength and durability of concrete

Influencia Del Mucílago De Nopal Y Extracto De Algas Cafés en El Grado De Hidratación De Pastas De Cemento Portland Ordinario

Polysaccharides derived from tragacanth as biocompatible polymers and Gels

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