Mechanism of compacted biochar amended expansive clay subjected to drying–wetting cycles: simultaneous investigation of hydraulic and mechanical properties

Wang, Hao; Garg, Ankit; Huang, Shan; Mei, Guoxiong

doi:10.1007/s11600-020-00423-2

Artykuł - szczegóły

Tytuł artykułu

Mechanism of compacted biochar amended expansive clay subjected to drying–wetting cycles: simultaneous investigation of hydraulic and mechanical properties

Autorzy

Wang Hao , Garg Ankit , Huang Shan , Mei Guoxiong

Wybrane pełne teksty z tego czasopisma

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

Identyfikatory

DOI

10.1007/s11600-020-00423-2

Warianty tytułu

Języki publikacji

Abstrakty

Biochar has been extensively studied in the aspect of amendment of compacted sandy/clayed soils, whereas its application as amendment in expansive soil is rare. Hydraulic and mechanical properties of biochar-amended expansive soil especially impacts of drying–wetting cycles have been rarely investigated. Aiming at construction of sponge city, straw biochar-amended expansive soil and the control soil (i.e., without biochar) are subjected to drying–wetting cycles in this study. During drying–wetting cycles, energy-dispersive spectrometer and Fourier transform infrared (FTIR) spectroscopy analyses were conducted to investigate microchemical composition including. Pore size distribution and microstructure were measured using nitrogen gas-adsorption technique and scanning electron microscope, respectively. Further, changes in soil water retention curve, void ratio, crack intensity factor (CIF, i.e., ratio of cracked section area to the total soil area) and shear strength were also determined. It is found that there is no diference in water retention capacity between various soils for near-saturated samples. Under high suction, however, more water could be retained within mesopores of biochar-amended soil. FTIR analysis indicates that biochar-amended expansive soil shows stronger chemical bonding, irrespective of them being subjected to drying–wetting cycles. The weak alkalinity of straw biochar results from its main chemical composition (i.e., calcium carbonate). It is noteworthy that straw biochar improves soil water retention capacity, which further restrains desiccation cracks. Cohesion of biochar–soil composite is also improved due to chemical bonding. Aiming at green roofs, straw biochar could be promising option for expansive soil amendment technically and economically.

Słowa kluczowe

biochar-amended expansive soil sponge city drying cycle wetting cycle Fourier transform infrared spectroscopy water retention

gleba ekspansywna gleba wzbogacona biowęglem miasto gąbka cykl suszenia cykl zwilżania spektroskopia w podczerwieni z transformacją Fouriera retencja wody

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2020

Tom

Vol. 68, no. 3

Strony

737--749

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

Huang Shan

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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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-f3fec604-3ae0-4b44-9692-83ecddb0f03d