Abstract
Stability of any structure depends on strength properties of underground soil on which it is constructed. Structures basically transfer all the loads comes on itself directly to the ground. If the underlying soil is not stable enough to support transferred loads then various types of failure occur such as settlement of the structure, cracks and so on. To solve this issue, soil improvement is necessary because it not only lowers the construction cost but also cuts the risk of any damage of structure later on. Numerous improvement methods can be adopted to make ordinary soil stable enough to support the structural loads. In this research work a number of tests were conducted using both ordinary soil and fiber reinforced soil. Soil samples for unsoaked and soaked CBR tests were prepared at its maximum dry density analogous to its optimum moisture content in the CBR mould with and without fiber. The reinforcing agent used in this study are natural bamboo fibers having diameter of 3 and 6 mm and length of 10 and 20 mm respectively. The proportion of bamboo fiber by waterless weight of normal soil was used as 0.20, 0.40, 0.60, 0.80, 1.00, 1.20 and 1.40%. Bamboo fiber is natural fiber, acts as a strengthening material for ordinary soil. It binds the soil particles together and helps in reduction of rapid change in volumetric properties. Addition of fiber improves the ductility behavior and increases the CBR value of ordinary soil. It was observed from the test results that unsoaked and soaked CBR value of soil increases with the increase in length and diameter of bamboo fiber. It was also found that increasing the percentage of bamboo fiber increases the CBR value of reinforced soil, and this increment is significant at fiber dosage of 1.2%. This significant increase of CBR value will diminish the thickness of pavement.
Highlights
Soil may be defined upper layer of the earth containing of air, water and hard elements is normally formed by fragmentation of rocks
The unsoaked and soaked California Bearing Ratio (CBR) values of ordinary soil and soil strengthened with varying percentages, length and diameter of bamboo fiber determined in the laboratory are shown in Tables 4 and 5
The clarification of tests results such as effects of bamboo fiber content, length of bamboo fiber and diameter of bamboo fiber on CBR value for both soaked and unsoaked condition of soil have been discussed in the subsequent sections
Summary
Soil may be defined upper layer of the earth containing of air, water and hard elements is normally formed by fragmentation of rocks. Soil is one of the most significant and primary media for any kinds of construction work all over the world. The soil that lies under ground level and spreads to such distance as may influence the support of the pavement is called subgrade soil. The subgrade should be susceptible to support loads dispatched from the pavement structure. The strength of a soil to be used as a subgrade. Brahmachary and Rokonuzzaman Geo-Engineering (2018)9:10 in pavement is evaluated from its CBR value. If the CBR value of soil is poor, the thickness of pavement will be high, which will result in high cost of construction and vice versa. Subgrade soil improvement has always been momentous aspect in transportation and geotechnical engineering fields to improve its load bearing capacity. Soil improvement is of main concern in the construction works due to fast growth of urbanization and industrialization
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