Cement Compositions with the Chitosan Additive

Ustinova, Yu.V.; Nikiforova, T. P.

doi:10.1016/j.proeng.2016.08.247

Cited by 22 publications

(21 citation statements)

References 1 publication

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“…4) out of the three beams for each mixture only one was compact enough for the three point bending test and even though the test results indicated several damage to the specimens, thus the durability coefficient of DG 1 and DG 5 mortars should be approached with a distance. Overall the biopolymer addition lead to improvement of durability as expected based on results found in the literature [3,17,18,22,23]. The DG addition notably worsens the durability, so it's even lower than the one of mortar with no admixture.…”

Section: Durabilitysupporting

confidence: 80%

“…[1,2] The previous results declare, that even though most of the VEAs are polysaccharides, due to the amount needed to improve concrete properties they do not slow the hydratation reactions of clinker minerals in cement, therefore, if the dosage is similar, they should not affect the hydratation reaction of NHL mortar neither. [1,3] The current study focuses on the impact of addition of non-traditional biopolymerical VEAs on the hardened properties and durability of natural hydraulic lime-based mortar. The biopolymers used are microbial based (xanthan gum (XG), and diutan gum (DG)) and seaweed based (carrageenan (CG), and sodium salt of alginic acid (ALGNA)).…”

Section: Introductionmentioning

confidence: 99%

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Physical-Mechanical Properties and Durability of Hydraulic Lime-Based Mortars With Non-Traditional Biopolymers

Žižlavský¹,

Vyšvařil²,

Rovnanı́ková³

2019

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The study focuses on the influence of addition of four different biopolymers in various doses (0.1%, 0.5%, and 1%) on the physical-mechanical properties and durability of NHL 3.5 mortars prepared with constant water/binder ratio and the binder/aggregate ratio of 1 : 2 by weight. The flow table test was carried out and the specimens were tested for flexural and compressive strength at the age of 7 and 28 days. The durability coefficient for the flexural strength was calculated after 15 freezing-thawing cycles. All the admixtures have dosage-dependent slump reducing effect. The strengths were increased in comparison with mortar with no admixture, the most significantly in the case of highest dose of carrageenan and diutan gum. All biopolymers with the exception of diutan gum increased the durability coefficient with increasing dosage. Sodium salt of alginic acid has been found the most effective in the case of durability improvement.

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Section: Durabilitysupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Physical-Mechanical Properties and Durability of Hydraulic Lime-Based Mortars With Non-Traditional Biopolymers

Žižlavský¹,

Vyšvařil²,

Rovnanı́ková³

2019

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“…The decrease in the fresh mortar density with growing water content, as well as with incorporation of a biopolymeric admixture (mainly HPMC), has been documented by several authors for lime and cementitious mixes [36,39,48,53,54]. The air-entraining function of the HP derivatives of cellulose and guaran has been demonstrated, in accordance with the literature research [27,36,39,53,54], by significantly increasing the air content in fresh mortar; however, HPCH has shown, contrary to previous results of authors [39,42,48], an inefficiency in this mix setup, acting more like the VMA, as observed by Y. Ustinova and T. Nikoforova [41], for chitosan in the cementitious mixture. The significant alteration to mortar rheology by incorporation of DG led to a decrease in the air entrained.…”

Section: Fresh-state Propertiessupporting

confidence: 88%

“…Hydroxypropyl chitosan (HPCH)-an HP derivative of chitosan, which is prepared by deacetylation of chitin, the second-most abundant polysaccharide on Earth that is widely found, e.g., in the shells of marine crustaceans. While used in cementitious materials, HPCH increases viscosity and water retention value (WRV) [40,41]. In lime mortars, it has similar effects as HPG, but with lower efficiency [39,42].…”

Section: Introductionmentioning

confidence: 99%

Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures

2021

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This article studies the influence of biopolymeric viscosity-modifying admixtures with water-retentive function on the physico-mechanical properties of natural hydraulic lime-based mortars and their adherence to the traditional fired-clay brick substrate. The use of admixtures increases the water/binder ratio, which in turn leads to a decrease in the strength of the mortars. The viscosity-modifying function improves the adhesive strength between mortar and pre-wetter brick by increasing the binder paste viscosity, while the water-retentive function along with increased water content may lead to a decrease in adhesive strength. On the contrary, water retention and increased water content are beneficial on a dry surface, while paste viscosity plays only a minor role. When subjected to temperature-varying cycles, the mortars are more prone to in-mortar failure during the pull-off test. The air-entraining function of some admixtures improves the frost resistance of the mortars; however, it would negatively affect the adhesive strength by incorporating pores into the contact zone between the mortar and brick substrate. This study showed that the use of some of the studied admixtures may improve the adhesion of mortar to the brick substrate.

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“…HPG a HPCH mají podobné vlastnosti jako HPMC, avšak nižší účinnost. [10,11]. Alginát sodný má pouze malý vliv na vlastnosti malty v čerstvém stavu, ale ve vyšších dávkách výrazně ovlivňuje strukturu výsledné malty a tím i její výsledné vlastnosti [12].…”

Section: úVodunclassified

Vliv vodoretenčních přísad na přídržnost malty k podkladu

Žižlavský¹

2022

Juniorstav

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Článek sleduje vliv biopolymerních viskozitu modifikujících přísad s vodoretenční funkcí na přídržnost malt na bází přirozeného hydraulického vápna k podkladu z plných pálených cihel vysušených nebo nasycených vodou. Při nanesení na nasycený podklad je pozorován nepříznivý vliv nadměrně vysoké retence vody v maltě a vysokého vodního součinitele, zatímco na suchém podkladu mají tyto vlastnosti pozitivní vliv. Je sledován také způsob porušení při odtrhové zkoušce, kde je častější výskyt porušení v maltě u malt na vysušeném podkladu. Každá ze zkoumaných přísad měla pozitivní vliv na přídržnost malty k podkladu alespoň v jednom ze sledovaných případů.

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Cement Compositions with the Chitosan Additive

Cited by 22 publications

References 1 publication

Physical-Mechanical Properties and Durability of Hydraulic Lime-Based Mortars With Non-Traditional Biopolymers

Physical-Mechanical Properties and Durability of Hydraulic Lime-Based Mortars With Non-Traditional Biopolymers

Bond Properties of NHL-Based Mortars with Viscosity-Modifying Water-Retentive Admixtures

Vliv vodoretenčních přísad na přídržnost malty k podkladu

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