Study on comparative performance of different pavement models incorporated with newly developed jute geotextiles under s
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Study on comparative performance of different pavement models incorporated with newly developed jute geotextiles under static loading Mahuya Ghosh1 · Guda Venkatappa Rao2,3 Received: 19 November 2019 / Accepted: 14 March 2020 © Springer Nature Switzerland AG 2020
Abstract This research paper describes a laboratory-based unpaved pavement model study incorporating new types of jute geotextiles (JGTs) intended for low-volume roads under static loading. Tests on the pavement models were carried out to evaluate the performance of four types of JGTs, viz. (1) grey (untreated) JGT, (2) rot-proof treated JGT (using reasonably eco-friendly chemicals) and (3) two types of jute–polypropylene (PP) blended geotextiles laid in between a modelled Wet Mix Macadam layer and a suitably compacted subgrade layer. Three types of subgrade soils were used from different geo-climatic regions of the Indian subcontinent including Black Cotton soil. Model tank preparation was done by judiciously selecting some combinations of JGT and subgrade soil based on the outcome of a fundamental study on biodegradability behaviour of these JGTs in the experimental saturated soils. Model tanks were water-treated for different durations up to six months to keep the subgrade soil and the JGT 100% saturated uninterruptedly before testing to study the effect of time-dependent biodegradability behaviour of the pavement models with and without JGT both. Experimental results clearly indicate that there is a substantial improvement in stress–strain behaviour of the pavement models due to incorporation of any type of the experimental JGTs over control models. The time-dependent model study reveals improvement in stress–strain behaviour of the system in spite of degradation of the JGTs, and jute–PP blended JGT is most effective in improving the pavement models. This indicates that consolidation of subgrade has occurred within a period of 3–6 months. Keywords Jute geotextiles · Rural road · Biodegradability · Pavement model test · Stress–strain behaviour
1 Introduction To improve the connectivity of the rural areas, the Government of India has taken up massive rural road construction activities under the Pradhan Mantri Gram Sadak Yojana (PMGSY) programme since the start of this millennium. This envisages all-weather road access to all villages with population up to 500 and above (250 and above for hilly areas). According to Road Development Plan Vision: 2021
[1], other district roads and village roads (low traffic volume roads) come under rural road category. Expenditure for construction of these roads is increasing every year, especially with poor subgrade soils found abundantly in the Indian subcontinent. According to Indian Road Congress manual IRC: SP-72-2015 [2], soil stabilization is recommended, whenever California Bearing Ratio (CBR) value of the subgrade is less than 5% to achieve minimum design CBR strength of subgrade to be
* Mahuya Ghosh, [email protected] | 1Geotech Cell, Indian Jute Industries’ Research Association (IJIRA), 17 Taratala Road,
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