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Utilization of coconut shell residual in green roof: hydraulic and thermal properties of expansive soil amended with biochar and fbre including theoretical model

Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The study intends to explore hydraulic and thermal properties of expansive soils treated with fbre, biochar and biochar–fbre mix. Both fbre and biochar are derived from coconut shell, which is highly common in coastal regions around the world. Besides, benefts, limitations and engineering feasibility of these geomaterials in green roofs are explored. Theoretical framework for thermal–hydraulic analysis is proposed based on mass conservation and the frst law of thermodynamics. Heat capacity, thermal conductivity, water retention curve, crack intensity factor (CIF) and saturated and unsaturated hydraulic conductivities of four kinds of soils are evaluated and compared. Characterizations of geomaterials are also investigated via thermal mass loss, micro-structure, surface area and functional groups identifcation. Both biochar and fbre admixtures contribute to improvement in soil heat capacity and saturated and unsaturated hydraulic conductivities. Biochar enhances saturated and residual water contents of expansive soil by 10% and 8%, respectively. Also, biochar decreases soil thermal conductivity and CIF by 31% and 5%, respectively, while fbre decreases soil-saturated and residual water contents by 15% and 29%, respectively, and reduces soil thermal conductivity and CIF by 21% and 50%, respectively. Soil–biochar–fbre composite is also recommended due to low air-entry value, acceptable water-holding capacity and limited crack propagation. The study flls the knowledge gap of how soil thermal–hydraulic properties are afected due to biochar and/or fbre admixture. It is recommended to pay more attention on production and utilization of biochar derived from coconut shell currently utilized for fbre extraction.
Czasopismo
Rocznik
Strony
1803--1819
Opis fizyczny
Bibliogr. 53 poz.
Twórcy
autor
  • College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi, Nanning 530004, Guangxi, China
autor
  • College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi, Nanning 530004, Guangxi, China
  • College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi, Nanning 530004, Guangxi, China
  • College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi, Nanning 530004, Guangxi, China
autor
  • College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China
  • Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi, Nanning 530004, Guangxi, China
Bibliografia
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  • 44. Usowicz B, Lipiec J, Lukowski M et al (2016) The effect of biochar application on thermal properties and albedo of loess soil under grassland and fallow. Soil Till Res 164:45–51
  • 45. Villar MV, Lloret A (2008) Influence of dry density and water content on the swelling of a compacted bentonite. Appl Clay Sci 39:38–49
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  • 47. Wang L, Chen L, Tsang DCW (2019) The roles of biochar as green admixture for sediment-based construction products. Cem Concr Comp 104:103348
  • 48. Wang H, Garg A, Huang S et al (2020) Mechanism of compacted biochar-amended expansive clay subjected to drying-wetting cycles: simultaneous investigation of hydraulic and mechanical properties. Acta Geophys 68:737–749
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  • 50. Xie CR, Ni PP, Xu MJ et al (2020) Combined measure of geometry optimization and vegetation for expansive soil slopes. Comput Geotech. https://doi.org/10.1016/j.compgeo.2020.103588
  • 51. Ye YX, Zou WL, Han Z et al (2019) Predicting the entire soil-water characteristic curve using measurements within low suction range. J Mt Sci 16:1198–1214
  • 52. Zhang QZ, Wang YD, Wu YF et al (2013) Effects of biochar amendment on soil thermal conductivity, reflectance, and temperature. Soil Sci Soc Am J 77(5):1478–1487
  • 53. Zhang L, Fukuda H, Liu Z (2019) Households’ willingness to pay for green roof for mitigating heat island effects in Beijing (China). Build Environ 150:13–20
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-d658e934-f81d-4144-b597-aafd753959f0
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