Effect of rice husk biochar and coal fly ash on some physical properties of expansive clayey soil (Vertisol)

Auteur(s) et Affiliation(s)

LU, S.-G.

Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, College of Environmental and Resources Sciences, Zhejiang Univ., Hangzhou, Chine

SUN, F.-F.

Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, College of Environmental and Resources Sciences, Zhejiang Univ., Hangzhou, Chine

ZONG, Y.-T.

Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, College of Environmental and Resources Sciences, Zhejiang Univ., Hangzhou, Chine

Description :
The aim of this work is to evaluate the effect of rice husk biochar (RHB) and coal fly ash (CFA) on the formation and stability of aggregates, pore size distribution, water retention, swell–shrinkage, consistency limit, and tensile strength of an expansive clayey soil (Vertisol). Results indicate that : the RHB promotes the formation of macroaggregates and resists aggregate slaking; RHB and CFA change the pore size distribution and increase larger pores of soil; RHB and CFA decrease the tensile strength and coefficient of linear extensibility (COLE) of clayey soil. The RHB and CFA are therefore able to improve the physical quality and swelling–shrinkage status of expansive clayey soils, being a potential soil amendment for improving poor physical characteristics of the clayey soil.

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, vol. 114, p. 37-44, nombre de pages : 8, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais