The potential use of chitosan as a biopolymer additive for enhanced mechanical properties and water resistance of earthen construction

Aguilar, Rafael; Nakamatsu, Javier; Ramı́rez, Eduardo; Elgegren, Mariela; Ayarza, Jorge; Kim, Su Yeon; Pando, Miguel A.; Ortega-San-Martín, Luis

doi:10.1016/j.conbuildmat.2016.03.218

Cited by 105 publications

(62 citation statements)

References 28 publications

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“…They are biodegradable and have no negative effects on the environment; therefore, they might be favorable soil-improvement material 7 . Also, unlike MICP, biopolymer treatment can be used for the improvement of fine-grained soil 9,10 . An additional reason why biopolymers have an advantage over MICP is the fact that they do not require any nutrient injection and can be directly used for ground improvement.…”

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confidence: 99%

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Soldo

Miletić

Auad

2020

Sci Rep

166

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improving soil engineering properties is an inevitable process before construction on soft soil. increasing soil strength with chemical stabilizing agents, such as cement, raises environmental concerns. therefore, sustainable solutions are in high demand. one of the promising solutions is the usage of biopolymers. Five biopolymer types were investigated in this study: Xanthan Gum, Beta 1,3/1,6 Glucan, Guar Gum, Chitosan, and Alginate. Their effect on the soil strength improvement was experimentally investigated by performing unconfined compression, splitting tensile, triaxial, and direct shear tests. All tests were performed with different biopolymer concentrations and curing periods. Additionally, in order to have an insight on the susceptibility to natural elements, plain soil, and biopolymertreated specimens were exposed to real atmospheric conditions. The extensive experimental results showed that the soil strength tends to increase with the increase of biopolymer concentration and with the curing time. However, it was shown that the soil strength does not considerably change after a certain biopolymer concentration level and curing time. furthermore, it has been observed that the biopolymer-treated specimens showed better resistance to the influence of the environmental conditions. In general, Xanthan Gum, Guar Gum, and Beta 1,3/1,6 Glucan showed the most dominant effect and potential for the future of sustainable engineering.

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confidence: 99%

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Soldo

Miletić

Auad

2020

Sci Rep

166

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“…One class of modern, widely available organic products are biopolymers which are receiving attention as stabilisers for earthen materials due to their potential green credentials (Chang, et al, 2016). Recent work reported in Aguilar, et al, (2016) and Nakamatsu, et al, (2017) has investigated the use of biopolymers (namely chitosan and carrageenan) as stabilisers and has reported that the addition of these biopolymers improved mechanical and durability performance of earthen materials. Very recently, the mechanical behaviour of earthen construction materials stabilised with the biopolymers guar gum and xanthan gum was studied by Muguda, et al, (2017) which showed that the addition of these biopolymers improved compressive and tensile strengths.…”

Section: Durability Of Earthen Construction Materialsmentioning

confidence: 99%

Advances in the Use of Biological Stabilisers and Hyper-compaction for Sustainable Earthen Construction Materials

Muguda

Lucas

Hughes

et al. 2019

Earthen Dwellings and Structures

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“…Among the challenges, adobe presents low compressive strength and high water absorption. Researchers analyse various stabilizers (some as a form of waste) to improve such properties of adobe (Millogo et al, 2014;Corrêa et al, 2015;Danso et al, 2015;Aguilar et al, 2016;Dove et al, 2016;Hamard et al, 2016;Laborel-Préneron et al, 2016;Millogo et al, 2016;Stazi et al, 2016;Eires et al, 2017;Nakamatsu et al, 2017;Gandia et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Physical, Mechanical and Thermal Behaviour of Adobe Stabilized With the Sludge of Wastewater Treatment Plants

et al. 2019

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The need for treated water is essential for life. With the constant increase in population, the most common way to purify surface water is through conventional water treatment plants (WTPs). The high volume of residue (sludge) generated in this process is most often returned to the catchment site, negatively affecting the ecosystem. The sludge of WTPs is similar to soil because it is composed of inorganic solids. Adobe is a construction material made from water and soil without the burning process, so it is considered sustainable, recyclable, and energy-efficient and can be stabilized with various materials. Therefore, the objective of this work is to develop adobes using the sludge of WTPs and to analyse their physical, mechanical and thermal properties. Adobes were produced with five concentrations of sludge by mass: 0, 1, 3, 5 and 7%. It was observed that with the increase in the sludge concentration, there was an increase in the capillarity and a decrease in mass, the water absorption was limited to 3% of sludge, and there was an increase in the bulk density. The linear shrinkage, thermal conductivity and compressive strength were not influenced. The addition of WTP sludge altered some properties of adobe. The use of WTP sludge in adobe is limited to 3%; above that, the adobe becomes unstable in relation to water. Therefore, the use of WTP sludge in the manufacture of adobe is feasible in controlled concentrations and is a sustainable use of the residue.

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The potential use of chitosan as a biopolymer additive for enhanced mechanical properties and water resistance of earthen construction

Cited by 105 publications

References 28 publications

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Biopolymers as a sustainable solution for the enhancement of soil mechanical properties

Advances in the Use of Biological Stabilisers and Hyper-compaction for Sustainable Earthen Construction Materials

Physical, Mechanical and Thermal Behaviour of Adobe Stabilized With the Sludge of Wastewater Treatment Plants

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