Authors :
Assefa Takele; Fekadu Fufa
Volume/Issue :
Volume 5 - 2020, Issue 12 - December
Google Scholar :
http://bitly.ws/9nMw
Scribd :
https://bit.ly/2Mk0ouW
Abstract :
Weak sub-grade soil is one of the most
plentiful soils in Ethiopia, which mostly causes
significant damage to structures such as roads and
bridges due to their weak in strength. Therefore this
study assessed the effects of gypsum and brick mix on
weak sub-grade soil to use as a road subgrade
preparation. Weak sub-grade soil sample was collected
from different location of Ethiopia. The weak subgrade
soil were mixed with the brick and gypsum by
percentage of the weight of soil taken for each samples
tests starting from to within differenceand 0
to within difference respectivelyand laboratory
tests such as Atterberg limit, Compaction, and CBR are
carried out to assess the alteration in its strength
characteristics and index properties. Based on the
laboratory test results, the subgrade material quality
improved from A-7-5 to A-2-4 at combination of
crushed waste brick and of gypsum with expansive
soil. By the addition of material to weak sub-grade soil
the least plasticity index value obtained was and
the CBR increased to from initial CBR value at
the percentage of brick and gypsum. The MDD
was increased to
from the initial untreated soil
test at percentage of crushed waste brick and
gypsum mix with expansive soil. From analysis of
results,it shown that the mixture of of crushed
waste brick and of gypsum was the optimum
combination material for stabilization of weak sub-grade
soil to comply with the required technical specification
specified in AASHTO. Treating weak sub-grade soil with
the mix of crushed waste brick and gypsum respond and
exhibited an improvement on its engineering properties
including reduction in plasticity, increased strength and
compaction characteristics.
Keywords :
Crushed Waste Brick, Gypsum; Strength, Weak Sub-grade Soi
Weak sub-grade soil is one of the most
plentiful soils in Ethiopia, which mostly causes
significant damage to structures such as roads and
bridges due to their weak in strength. Therefore this
study assessed the effects of gypsum and brick mix on
weak sub-grade soil to use as a road subgrade
preparation. Weak sub-grade soil sample was collected
from different location of Ethiopia. The weak subgrade
soil were mixed with the brick and gypsum by
percentage of the weight of soil taken for each samples
tests starting from to within differenceand 0
to within difference respectivelyand laboratory
tests such as Atterberg limit, Compaction, and CBR are
carried out to assess the alteration in its strength
characteristics and index properties. Based on the
laboratory test results, the subgrade material quality
improved from A-7-5 to A-2-4 at combination of
crushed waste brick and of gypsum with expansive
soil. By the addition of material to weak sub-grade soil
the least plasticity index value obtained was and
the CBR increased to from initial CBR value at
the percentage of brick and gypsum. The MDD
was increased to
from the initial untreated soil
test at percentage of crushed waste brick and
gypsum mix with expansive soil. From analysis of
results,it shown that the mixture of of crushed
waste brick and of gypsum was the optimum
combination material for stabilization of weak sub-grade
soil to comply with the required technical specification
specified in AASHTO. Treating weak sub-grade soil with
the mix of crushed waste brick and gypsum respond and
exhibited an improvement on its engineering properties
including reduction in plasticity, increased strength and
compaction characteristics.
Keywords :
Crushed Waste Brick, Gypsum; Strength, Weak Sub-grade Soi
