dc.contributor.author |
Inan, III |
|
dc.contributor.editor |
Pasindu, HR |
|
dc.date.accessioned |
2022-06-07T05:34:33Z |
|
dc.date.available |
2022-06-07T05:34:33Z |
|
dc.date.issued |
2015-08 |
|
dc.identifier.citation |
Inan, I.I.I., & Pasindu, H.R. (2015). Effect of fine percentage on properties of sub base material [Abstract]. In H.R. Pasindu (Ed.), Proceedings of the Transportation Research Forum 2015 (pp. 4-5). Department of Civil Engineering, University of Moratuwa. https://uom.lk/sites/default/files/civil/files/TRF%202015_0.pdf |
en_US |
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/18159 |
|
dc.description.abstract |
With the huge infrastructure development in Sri Lanka, construction of roads plays a vital
role. Massive quantities of construction materials required for these highway and
expressway constructions. Finding sub base material as per specification is a major issue in
most part of the country. Therefore, in some road construction projects, crushed stone has
been used as an alternative material to replace sub base material. Due to the scarcity of
good quality material, there is a need of research to use marginal materials for sustainable
development in the highway industry.
Standard Specification for Construction and Maintenance of Roads and Bridges (SCA/5)
(SSCM) (ICTAD, 2009) used as a road construction specification in Sri Lanka. Liquid limit
(LL), plastic limit (PL), maximum dry density (MDD), California bearing ratio (CBR) and sieve
analysis are specified in selection of gravel sub base material. According to sieve analysis
requirements in SSCM, percentage of passing 75 μm sieves should be 5-25 percent by
weight. This grading limit for sub base material was adapted to the specification in second
edition of SSCM in 2009. Questionnaire survey conducted among senior engineers has
expressed that one of the least important parameter in material selections was grading (
84%of the participants) and 16% of the engineers have expressed grading as the most
difficult parameters to meet. This study was conducted to see the possibility of relaxing the
passing percentage of fine fraction.
Experimental study was conducted altering the fine fraction of soils varying from 0-40%.
Properties of those samples were tested. It was found that there is a linear relationship with
high correlation factor between fine fraction of the material and it's properties (CBR, MDD,
OMC). Only three samples out of ten samples were within the grading band requirement and
nine samples out of ten samples satisfy CBR requirements. By scrutinizing the findings and
available literature, it can be recommended that grading band of No.200 sieve passing can
be relaxed up to 35% if soil sample satisfy the specified CBR requirement (30), PI value is
less than or equal to 10 and swell percentage is less than 2%. Further, a linear regression
model was fitted to assess the CBR of the material with reference to fine fraction (Percentage passing of 425μm, 300μm, 75μm sieves). Statistical analysis shown that
material passing 425μm & retained on 300 μm, and 75μm passing percentage are the
significant parameters are when predicting CBR of the selected soil in this study. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Department of Civil Engineering, University of Moratuwa. |
en_US |
dc.relation.uri |
https://uom.lk/sites/default/files/civil/files/TRF%202015_0.pdf |
en_US |
dc.subject |
California Bearing Ratio |
en_US |
dc.subject |
Grading band |
en_US |
dc.subject |
Fine fraction |
en_US |
dc.title |
Effect of fine percentage on properties of sub base material |
en_US |
dc.type |
Conference-Abstract |
en_US |
dc.identifier.faculty |
Engineering |
en_US |
dc.identifier.department |
Department of Civil Engineering |
en_US |
dc.identifier.year |
2015 |
en_US |
dc.identifier.conference |
Transport Research Forum 2015 |
en_US |
dc.identifier.place |
Katubedda |
en_US |
dc.identifier.pgnos |
pp. 4-5 |
en_US |
dc.identifier.proceeding |
Proceedings of the Transport Research Forum 2015 |
en_US |
dc.identifier.email |
irazinan@gmail.com |
en_US |