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

Wang, Hao; Garg, Ankit; Zhang, Xiaoyong; Xiao, Yangyang; Mei, Guoxiong

doi:10.1007/s11600-020-00492-3

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Tytuł artykułu

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

Autorzy

Wang Hao , Garg Ankit , Zhang Xiaoyong , Xiao Yangyang , Mei Guoxiong

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-020-00492-3

Warianty tytułu

Języki publikacji

Abstrakty

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.

Słowa kluczowe

biochar green roof coconut shells expansive soil fibre sponge city

biowęgiel dach zielony skorupy kokosa grunt ekspansywny błonnik miasto gąbka

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2020

Tom

Vol. 68, no. 6

Strony

1803--1819

Opis fizyczny

Bibliogr. 53 poz.

Twórcy

autor

Wang Hao

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

Garg Ankit

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

Zhang Xiaoyong

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

Xiao Yangyang

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

Mei Guoxiong

meiguox@163.com

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

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Typ dokumentu

Bibliografia

Identyfikator YADDA

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