Lignin-Based Hybrid Admixtures and their Role in Cement Composite Fabrication

Kłapiszewski, Łukasz; Klapiszewska, Izabela; Ślosarczyk, Agnieszka; Jesionowski, Teofil

doi:10.3390/molecules24193544

Cited by 33 publications

(19 citation statements)

References 39 publications

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“…The structure of lignin is very complex, and the degradation products depend strongly on the type of biopolymer, the bonds linking the monomers, and the moisture content. These data correlate well with those reported in previous studies [ 51 , 52 ].…”

Section: Resultssupporting

confidence: 93%

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

et al. 2020

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Biopolymer-based spherical particles exhibit unique properties including narrow sizes and many functional groups on their surfaces. Therefore, they show great potential for application in many scientific and industrial processes. The main aim of this study was to prepare lignin-based spherical particles with the use of a cationic surfactant, hexadecyl(trimethyl)ammonium bromide (CTAB). In the first step, different preparation procedures were tested with varying parameters, including biopolymer and surfactant ratios, lignin filtration, and experimental time. The morphological and dispersion characteristics of the materials were determined to select the best samples with the most promising properties, which could then be tested for their acute toxicity. It was observed that almost all materials were characterized by spherical shapes in micro- and nanosizes. The sample with the best physicochemical properties was used for further analysis and then tested for medical applications: the improvement of the stability of a drug molecule, cilazapril (CIL). The formulated material (CIL@LC-2a 1:1 wt./wt.) exhibited outstanding properties and significantly improved the stability of cilazapril as tested in conditions of increased temperature and humidity. Lignin spherical particles may be employed as a promising material for shielding other active compounds from decomposition.

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Section: Resultssupporting

confidence: 93%

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

et al. 2020

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“…With the increase in the amount of lignin in the composite, the value of compressive strength decreased, which is probably related to a greater aeration of the cement paste. Similar relationships have been reported by other researchers for lignosulfonates, hence the maximum amount of admixtures in cement composites is usually up to 0.5 wt.% in relation to cement [2, 43,44]. As the bio-admixture in the system was replaced with silica, an increase in compressive strength was observed for both 0.5 and 1 wt.% samples.…”

Section: Compressive Strength Properties With the Silica Lignin And supporting

confidence: 86%

“…The authors of publications [40][41][42][43] also observed an increase in the plasticity of mixtures with the addition of lignin or its derivatives. Kalliola et al [40] reported a beneficial effect of the admixture of oxidized lignin on the flow rate for pastes, mortars and concretes.…”

Section: Slump Test Resultsmentioning

confidence: 93%

“…In his research, he confirmed that the setting time, compressive strength and water reduction values increased together with the increase in lignosulfonate in the admixture. In their work, Klapiszewski et al [43] showed that lignin had a more favorable effect than lignosulfonate on the mechanical properties of cement mortars. Increased plasticity was noted for both lignin and lignosulfonate samples.…”

Section: Slump Test Resultsmentioning

confidence: 99%

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Biopolymer-Based Hybrids as Effective Admixtures for Cement Composites

et al. 2020

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In the framework of this publication, silica-lignin hybrid materials were designed, obtained, characterized and then used as admixtures for cement composites. High-energy mechanical grinding of individual components was used to produce the systems that allowed ensuring adequate homogeneity of the final products. As a result of the analysis of Fourier transform infrared spectroscopy, it has been confirmed that weak physical interactions occur between the components. This allowed classifying the resulting systems as I class hybrid materials. In addition, the efficiency of obtaining final products was also inferred on the basis of obtained porous structure parameters and colorimetric data. The achieved bio-admixture with different weight ratios of silica and lignin was added to cement pastes in the amount ranging from 0.5 to 1 wt.%. The study showed that increasing the ratio of lignin in the admixture from 0.15 to 1 wt.% had a positive effect on the rheological properties of the pastes, while the mechanical properties of the composite were deteriorated. In turn, a higher amount of silica in the admixture acted in reverse. The most favorable results were obtained for a silica-lignin bio-admixture with a weight ratio of components equal to 5:1 wt./wt. A significant increase in compressive strength was gained at satisfactory plasticity of the paste.

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“…Agriculture and forestry waste is primarily burnt on field in order to reduce the cost of disposal. When converted into biochar, this waste can be used as a partial substitute to cement, resulting in a significant reduction in greenhouse gas emissions and improving the mechanical properties of concrete [4,5].…”

Section: Introductionmentioning

confidence: 99%

Shielding Properties of Cement Composites Filled with Commercial Biochar

et al. 2020

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The partial substitution of non-renewable materials in cementitious composites with eco-friendly materials is promising not only in terms of cost reduction, but also in improving the composites’ shielding properties. The water and carbon content of a commercial lignin-based biochar is analyzed with thermal gravimetric analysis. Cementitious composite samples of lignin-based biochar with 14 wt.% and 18 wt.% are realized. Good dispersion of the filler in the composites is observed by SEM analysis. The samples are fabricated in order to fit in a rectangular waveguide for measurements of the shielding effectiveness in the X-band. A shielding effectiveness of 15 dB was obtained at a frequency of 10 GHz in the case of composites with 18 wt.% biochar. Full-wave simulations are performed by fitting the measured shielding effectiveness to the simulated shielding effectiveness by varying material properties in the simulator. Analysis of the dimensional tolerances and thickness of the samples is performed with the help of full/wave simulations. Lignin-based biochar is a good candidate for partial substitution of cement in cementitious composites, as the shielding effectiveness of the composites increases substantially.

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Lignin-Based Hybrid Admixtures and their Role in Cement Composite Fabrication

Cited by 33 publications

References 39 publications

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Biopolymer-Based Hybrids as Effective Admixtures for Cement Composites

Shielding Properties of Cement Composites Filled with Commercial Biochar

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