Authors :
Edy Sulistianto; Sukiman Nurdin; Syamsul Arifin
Volume/Issue :
Volume 8 - 2023, Issue 12 - December
Google Scholar :
http://tinyurl.com/5fszhstc
Scribd :
http://tinyurl.com/rremadj8
DOI :
https://doi.org/10.5281/zenodo.10473317
Abstract :
Stabilising expansive road subgrade by adding
natural limestone and iron oxide is an efficient and
economically valuable way of utilising local materials and
solving iron oxide waste in environmental problems. In
this study, the composition of the mixture was made with
proportions: limestone at the optimum level of 6% and
iron oxide with varying levels of 0%, 0.2%, 0.4%, 0.8%,
and 1.6%. As support in this study, X-ray Diffraction tests
and SEM photographs were also conducted to determine
the content and composition of expansive clay minerals
before and after mixing with stabilisation materials. The
test results showed the CBR value without soaking
expansive soil compacted according to standard
compaction: 12.31%; after being stabilised with 6%
limestone and 1.6% iron oxide additive, the value increases
to 25.37% with an increased ratio of 106.09%. For the
original soil soaking, the CBR value was 8.65%; after
stabilisation with 6% limestone and 1.6% iron oxide
additive, the value increased to 20.49% with an increase
ratio of 136.87%. The results of X-ray Diffraction testing
and SEM photos show the addition of new mineral
compounds after the original soil is mixed with limestone
and iron oxide stabilisation materials, including mineral
compounds C-S-H (Calcium Silicate Hydrate). This
chemical compound has cementation properties.
Keywords :
Subgrade, Expansive Soil, Limestone, Iron Oxide.
Stabilising expansive road subgrade by adding
natural limestone and iron oxide is an efficient and
economically valuable way of utilising local materials and
solving iron oxide waste in environmental problems. In
this study, the composition of the mixture was made with
proportions: limestone at the optimum level of 6% and
iron oxide with varying levels of 0%, 0.2%, 0.4%, 0.8%,
and 1.6%. As support in this study, X-ray Diffraction tests
and SEM photographs were also conducted to determine
the content and composition of expansive clay minerals
before and after mixing with stabilisation materials. The
test results showed the CBR value without soaking
expansive soil compacted according to standard
compaction: 12.31%; after being stabilised with 6%
limestone and 1.6% iron oxide additive, the value increases
to 25.37% with an increased ratio of 106.09%. For the
original soil soaking, the CBR value was 8.65%; after
stabilisation with 6% limestone and 1.6% iron oxide
additive, the value increased to 20.49% with an increase
ratio of 136.87%. The results of X-ray Diffraction testing
and SEM photos show the addition of new mineral
compounds after the original soil is mixed with limestone
and iron oxide stabilisation materials, including mineral
compounds C-S-H (Calcium Silicate Hydrate). This
chemical compound has cementation properties.
Keywords :
Subgrade, Expansive Soil, Limestone, Iron Oxide.
