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https://irjet.net/archives/V4/i1/IRJET-V4I1325.pdf
The road laid on bases formed of weaker soil leads to large deformations, causing increases in maintenance cost and interruption of traffic service. And if the subgrade layer of pavement consists of expansive soil (black cotton soil), due to its susceptibility to moisture change and results in subsequent high swelling and shrinkage characteristics. These soils possess less strength and bearing capacity and thereby results in increasing the thickness of pavement. There are many stabilization methods available to improve engineering properties of these types of soft subgrade soil. Use of geosynthetics over a soft subgrade (expansive soil) found to be one of the feasible and economic solutions to strengthen road pavement and thereby increasing service life. This study presents the effect of various geosynthetic products on soft subgrade (black cotton soil) in improving strength parameters.
TRANSPORTATION, 2005
Geotextiles and Geomembranes, 2021
This paper aims to assess the efficiency of using geogrid reinforcement for subgrade stabilization. The literature of applying geogrid reinforcement technique for pavements built on soft subgrades and the previous experiences were reviewed. Laboratory tests were conducted on soil reinforced with geogrids in one or several layers. The soil specimens were compacted in four layers with or without geogrid sheets. The California Bearing Ratio (CBR) test, in soaking condition, was performed on natural soil and soil-geogrid specimens. The test results revealed that the CBR value is much affected by the geogrid sheet location and the number of sheets used in the soil specimen. When a geogrid sheet was placed at the 1st layer of the soil, there was an increment of 26% in the CBR value. Moreover, the CBR value was significantly increased by 62% when geogridsheets were placed at all four layers. The high CBR value is attributed to interface friction and interlock involved in the geogrid/soil interactions. It could be concluded that geogrid reinforcement is successful and more economical technique.
2014
Usually the service life of pavement on weaker clayey subgrade is affected due to their high plasticity and compressibility behaviour. These soils possess low strength, CBR value and have high affinity to moisture. Hence seasonal changes affect properties of these soils adversely. Stabilization techniques using waste materials are listed in literature for improving properties of these types of soft subgrades. This paper discusses the performance of stabilized soft clayey soil for suitability as subgrade using two types of admixtures Robo sand and fly ash. Dynamic cone penetration test and CBR tests are carried out in lab and field on composite soil with varying admixture content and the results are presented. It is observed that there is a considerable improvement with admixture in both index & engineering properties. A reduction in plasticity and improvement in soaked CBR with admixture is observed. Results indicated a relatively high performance of robo sand admixture over fly ash.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/use-of-geosynthetic-material-to-improve-the-properties-of-subgrade-soil https://www.ijert.org/research/use-of-geosynthetic-material-to-improve-the-properties-of-subgrade-soil-IJERTV4IS010442.pdf Sustainable development cannot be done without introduction of new technology. The use of new technology makes the structure cost effective and durable. A new construction material is invented namely reinforced earth nearly 40 years ago. Reinforced earth improves the property of sub grade soil by using natural or synthetic material. In past years reinforcement can only be done by using steel bars but now days it can be done by using geosynthetic material. It is 25-45 % cost effective than ordinary treatment. Now a days geosynthetic material is used to increase the strength of soil. Performance of road is mainly dependent on sub grade conditions of soil. The condition of subgrade soil changes with time and condition and it mainly affects the stability and maintenance of roads and can be resolved by adopting appropriate measures. By using geosynthetic material we can reduce the maintenance of roads. In this paper my best attempt is to correlate between reduction in maintenance and use of geosynthetic material.
2014
Subgrade soil and its properties are very important in the design of road pavement structure. The subgrade function is to give adequate support to the pavement from beneath. The strength of week subgrade need to be enhanced from longevity perspective Reinforcing weaker soils using geo-synthetics like geo-grids to improve its strength is popular in many civil engineering projects namely, highway pavements, air field construction etc. Recently geogrid has gained increasing acceptance in road construction. The geogrid improves the ability to obtain compaction in overlying aggregates, while reducing the amount of material required be removing and replacing. In the present study engineering performance for soil subgrades reinforced with different types of geogrids varying in aperture sizes. Laboratory tests are conducted on the reinforced subgrades. The lab tests include index & engineering properties.Soaked and unsoaked CBR tests are carried out on unreinforced and reinforced samples. T...
Construction and Building Materials, 1996
Case Studies in Construction Materials, 2020
Many pavements have become useless within their design life due to sudden fall in subgrade strength as a result of unforeseen rise in the moisture content of the subgrade which may be due to a rise in ground water level (GWL) or water seeping through cracks on road pavement. Geosynthetic materials have been found worthy to be a good means of reinforcing subgrade by increasing the useful life of a pavement or substantially decreasing the thickness of the base course. Three different soil samples were obtained and were compacted according to West African Standard and CBR tests were carried out without reinforcement (geotextile) and also by placing geotextiles at various depths within the soil mass in single layers. Then the effect of the geosynthetic material (geotextile) was observed. The results show that the strength of the subgrade (laterite) is considerably lowered with increased moisture content; and the introduction of geotextile as reinforcement in the soil substantially increase the soil at all levels (2/5, 3/5, 4/5) with the maximum increase in strength observed to occur at 3/5 level from the base of the compacted soil.
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