Browsing by Author "Suvetha, B"

Now showing 1 - 5 of 5

item: Article-Abstract
Influence of plasticity index on sub-base material : experimental review
Tharaka, DGS; Suvetha, B; Mampearachchi, WK
Major parts of the Eastern and Northern Provinces of Sri Lanka are covered wi cohesionless soil. These locally available cohesionless soils have been utilized for construction of su base in road constructions. Recently cracks, settlement and outward movement have been observed' - the certain pavements constructed in the north and east. It is suspected that the poor plastic properti of locally available soil would have caused this failure. Objective of this paper is to identify tne influence of Plasticity Index on sub-base material properties and review the applicability of th current specifications for selection of low plasticity soil as Sub-base materiaL Based on the collecte information, a comprehensive laboratory tests program was formulated to investigate tinterrelationships between the soil properties such as grading, maximum dry density, CBR valu Plasticity Index, and Liquid Limit by mixing different type of clays with pure coarse sand (Ri Sand). Relationships between CBR Vs Plasticity Index and MDD Vs Plasticity Index have b established for a fine grade sub-base materiaL It was found that CBR is low at both low and hi plasticity soil. ICTAD specification specified upper limit for Plasticity Index has been verified in} experimental study. Experimental results emphasised the need of establishing a lower limit fort' Plasticity Index in selection of sub-base materiaL
item: Conference-Abstract
Investigation on, suitability of cohessionless soil as a highway construction material
(Department of Civil Engineering, University of Moratuwa., 2011) Suvetha, B; Tharaka, DGS; Ranasinghe, JACL; Mampearachchi, WK; Thilakasiri, S; Pasindu, HR
Major part of the Eastern and Northern provinces of Sri Lanka covered with Cohessionless soil which is available abundance in this region. It is important that utilization of locally available soil for the construction of the sub base of these roads to optimize the cost and reduce the environment impact. Recently it was noticed that failure in these roads which were constructed with this soil. It is suspected that failure, such as developing cracks and settlements due to properties of used locally available sandy soil which was complied with specification requirement. Objective of this paper is to analyse and improve specification requirements. As well propose methods of utilization of cohesionless soil as a highway construction material. Initially, visited related road constructions and spoke to resource personalities. Further, observed the change of soil properties such as grading, maximum dry density, CBR value, Plasticity index, and liquid limit by mixing different type of clays with pure coarse sand. Laboratory test results and field visit experiences have helped us to propose the construction methods when cohessionless soil is used.
item: Conference-Abstract
Investigation on, suitability of cohessionless soil as a highway construction material
(Department of Civil Engineering, University of Moratuwa, 2011) Suvetha, B; Tharaka, DGS; Ranasinghe, JACL; Mampearachchi, WK; Thilakasiri, S; Pasindu, HR
Major part of the Eastern and Northern provinces of Sri Lanka covered with Cohessionless soil which is available abundance in this region. It is important that utilization of locally available soil for the construction of the sub base of these roads to optimize the cost and reduce the environment impact. Recently it was noticed that failure in these roads which were constructed with this soil. It is suspected that failure, such as developing cracks and settlements due to properties of used locally available sandy soil which was complied with specification requirement. Objective of this paper is to analyse and improve specification requirements. As well propose methods of utilization of cohesionless soil as a highway construction material. Initially, visited related road constructions and spoke to resource personalities. Further, observed the change of soil properties such as grading, maximum dry density, CBR value, Plasticity index, and liquid limit by mixing different type of clays with pure coarse sand. Laboratory test results and field visit experiences have helped us to propose the construction methods when cohessionless soil is used.
item: Conference-Full-text
Study on the possible improvements if ICTAD specification for cohesionless soil to be used as a highway construction material
(Department of Civil Engineering, University of Moratuwa, 2011-12) Suvetha, B; Tharaka, DGS; Ranasinghe, JACL; Mampearachchi, WK; Thilakarisi, S; Rathnayake, N.
Major parts of the eastern and northern province of Sri Lanka are covered cohesionless soil. Utilization of locally available soil for the construction of the subbase of the roads will optimize the cost and reduce the adverse environmental impact. Recently cracks settlements and sandy soils. It is suspected that the usage of locally available soil would have caused this failure. Objective of the study is to assess the quality of the cohesionless soil as a highway construction material . Futher the applicability and validity of the currently used specifications for use of cohesion ess so' as a highway construction material are also evaluated. To accomplish the above tasks, the experience of the construction industry in this regard was gathered through site visits, case studies, interviews with relevant personel. Based on the collected information, a comprehensive laboratory test program was formulated to investigate the interrelationships between the soil properties such as grading, maximum dry density, CBR value, plasticity’ index, and liquid limit by mixing different types of clays with pure coarse sand. Laboratory test results and data collected from road construction project were analysed. Final results were reviewed by the senior consultant at RDA and NBRO.
item: Conference-Abstract
Suitability of cohesionless soil as a highway construction material
(2011) Suvetha, B; Tharaka, DGS; Ranasinghe, JASL; Mampearachchi, WK; Thilakasiri, KS
Major parts of the Eastern and Northern provinces of Sri Lankti are covered with cohesionless soil. Utilization of locally available soil for the construction of the subbase of these roads will optimize the cost and reduce the environmental impact. Recently cracks, settlement and outward movement have been observed in the pavement constructed using the locally available sandy soil. It is suspected that the usage of locally available soil would have caused this failure. Objective of this study is to assess the quality of the cohesionless soil as a highway construction material. Further, the applicability and validity of the currently used specifications for use of cohesionless soil as a highway construction material are also evaluated. To accomplish the above tasks, the experience of the construction industry in this regard WOJ gathered through site visits, case studies, interviews with relevant personals. Based on the collected information a comprehensive laboratory test program was formulated to investigate the interrelationships between the soil properties such as grading, maximum dry density, California Bearing Ratio(CBR) value, plasticity index(PI), and liquid limit by mixing different type of clays with pure coarse sand. Laboratory test results and field data collected from road construction projects were analyzed. Final results were reviewed by the senior consultants at Road Development Authority(RDA) and National Building and Research OrganizationfNBRO).