Performance evaluation of laterite soil embankment stabilized with bottom ash,coir fiber,and lime  

作　　者：Yunusa Hamdanu SANI Amin EISAZADEH 

机构地区：[1]School of Civil Engineering and Technology,Sirindhorn International Institute of Technology,Thammasat University,Pathum Thani 12120,Thailand

出　　处：《Journal of Mountain Science》2024年第7期2334-2351,共18页山地科学学报（英文）

摘　　要：In tropical regions,heavy rainfall induces erosion and shallow landslides on road embankments.Cement-based stabilization methods,common in these regions,contribute to climate change due to their high carbon footprint.This study explored the potential application of coir fiber-reinforced laterite soil-bottom ash mixtures as embankment materials in the tropics.The objective is to enhance engineered embankment slopes'erosion resistance and stability while offering reuse options for industrial byproducts.This study examined various mix designs for unconfined compressive strength(UCS)and permeability,utilizing 30%bottom ash(BA)and 1%coir fiber(CF)with varying sizes ranging from 10 to 40 mm,6%lime,and laterite soil(LS),followed by microstructural analyses.The results demonstrate that the compressive strength increases as the CF length increases to 25 mm.In contrast,permeability increases continuously with increasing CF length.Lime-treated mixtures exhibit superior short-and long-term strength and reduce permeability owing to the formation of cementitious materials,as confirmed by microstructural analyses.A lab-scale slope box was constructed to evaluate the surface erosion of the stabilized laterite soil embankment.Based on the rainfall simulation results,the LS-BA-CF mixtures show better resistance to erosion and deformation compared to untreated LS,especially when lime is added to the top layer.This study provides insights into a sustainable and cost-effective approach for slope stabilization using BA and CF,offering a promising solution for tropical regions susceptible to surface erosion and landslides.

关 键 词：Lateritic soil Bottom ash Coir fiber LIME Unconfined compressive strength PERMEABILITY FESEM/EDS Rainfall simulation tests 

分 类 号：U416.16[交通运输工程—道路与铁道工程]