TITLE:
Effect of Waste Bamboo Fiber Addition on Mechanical Properties of Soil
AUTHORS:
Motohei Kanayama, Satoko Kawamura
KEYWORDS:
Industrial waste, Bamboo fiber, Andsol, Unconfined compressive strength, Soil improvement
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.9 No.3,
July
5,
2019
ABSTRACT: For soil
improvement, a method using plant fiber has been used since ancient times. In
recent years, the construction
method using plant fiber has attracted attention as a ground improvement
technology with less environmental load. In this work, the soil improvement effect using waste bamboo fiber was
experimentally examined. The liquid limit and plastic limit of the mixed soil
tended to increase with increasing bamboo fiber content and there was no change
in the plasticity index of the mixed soil by the difference of bamboo fiber
content. As a result from the compaction test and unconfined compression
test, it was revealed that mixing of bamboo fiber resulted in a reduction of soil material required for construction and increasing in strength.
The maximum compressive stress of the bamboo fiber mixed soil at the mixing
ratio of 0%, 1%, 3% and 5% were 115, 108,
130 and 152 kN/m2, respectively. As the soil with fiber showed the
lower stiffness and higher strength than that without fiber in the dry region, it can be
judged that the addition of fiber brought ductility to the soil. And it was
found that the decrease in the stiffness of the specimen due to the increase of
water content was suppressed by the addition of the bamboo fiber. From the
results of the observation with the digital microscope, it was observed that
the two-layer structure consisting of the main relatively thick fibrous
structure and the secondary capillary fibrous structure were formed. Thus, it was found that the complex structure of the bamboo
fiber is deeply involved in the strength of the mixed soil.