IDENTIFICATION OF SOFT CLAY EXPANSIVITY WITH METHYLENE BLUE TEST AND THE EFFECT OF NANO SIZE PARTICLE OF RICE HUSK ASH (RHA) FOR EXPANSIVE SOIL IMPROVEMENT
The presence of nanomaterials in soil is indicated by the presence of nano-sized minerals that form soil and rocks, such as montmorillonite with a size of 100-500 nm (Das, 2014). These nano-sized minerals react chemically at the nanoscale as well. Indonesia produces around 50 million tons of rice...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/68723 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The presence of nanomaterials in soil is indicated by the presence of nano-sized
minerals that form soil and rocks, such as montmorillonite with a size of 100-500
nm (Das, 2014). These nano-sized minerals react chemically at the nanoscale as
well. Indonesia produces around 50 million tons of rice annually, with an average
of 4 million tons of rice husk ash produced (Muntohar, 2002). With this amount
generated,, there is a potential for the utilization of rice husk ash byproducts as a
soil improvement material.
The Methylene Blue test is a test to identify the soil expansiveness easily, quickly
and relatively affordable, compared to the expansivity test using the swelling test
and CBR. Methylene blue value (MBV) is linearly correlated with plasticity index
and exponentially correlated with expansive mineral content, swelling potential
and swelling pressure.
This study used rice husk ash (RHA) and nano rice husk ash (Nano RHA) as soil
stabilizers. The soil samples used for soil improvement were from Grobogan and
Wonogiri, Central Java, with a very high level of expansivity. Soil improvement
mixture using 5%, 10%, 15%, 20% and 25% of RHA with curing time 0, 3, 7, 14
and 21 days. Soil improvement mixed with 5% and 10% nano ASP based on the
weight of the soil used in the test.
Maximum dry density (MDD) parameter decreased along with the increase in
RHA levels. RHA can increase soil strength based on UCS test and reduce
expansivity based on index properties test, methylene blue test and swelling test.
Based on these considerations, the use of RHA more than 10% is considered
ineffective. The results of this test showed that the use of nanoparticles of rice
husk ash increased soil compressive strength by 15-20% and was more effective
in reducing expansiveness than rice husk ash with the same percentage. |
|---|