Coir Geotextiles for Paved Roads: A Laboratory and Field Study Using Non-Plastic Soil as Subgrade

ABSTRACT

In this paper, pavement proposed on soft subgrade (SG) that requires improvement is studied and reported. One of the methods of improvement is reinforcing SG with geotextile. Laboratory studies were conducted on both paved and unpaved sections, whereas field performance studies were conducted only on paved roads. Three types of woven and one type of nonwoven coir geotextiles were used as reinforcement in the laboratory study, out of which one woven geotextile was used in the field. Effects of reinforcements were studied by placing the geotextiles at different positions of the section in the lab model, and cyclic load tests were conducted and resistance to permanent deformation was reported. Field performances were evaluated by the Benkelman beam deflection (BBD) test, the dynamic cone penetration (DCP) test, and the field California bearing ratio (CBR) test. Test results indicate that the reinforced roads have less distress compared to the unreinforced one. Change in characteristic deflection, DCP indices, and about 50% improvement in field CBR values were obtained for the reinforced one.

摘要

本文对软土路基上提出的需要改进的路面进行了研究和报告.其中一种改进方法是用土工织物加固路基.实验室研究对铺面和未铺面路段进行，而现场性能研究仅对铺面道路进行.实验室研究采用三种机织物和一种无纺布椰壳纤维土工织物作为增强材料，其中一种机织土工织物用于野外.在实验室模型中，通过将土工织物放置在不同截面位置，研究了加筋效果，并进行了循环荷载试验，报告了加筋对永久变形的抵抗力.通过弯曲试验、动力触探试验和现场CBR试验，对现场性能进行了评价.试验结果表明，加筋后的道路与未加筋的道路相比，其受力较小.结果表明，加筋混凝土的特征变形量、动力触探指数和现场CBR值有50%左右的提高.

KEYWORDS:

• Coir geotextile
• subgrade
• subbase
• surface course
• characteristic deflection
• dynamic cone penetration index

关键词:

• 椰壳土工布
• 路基
• 底基层
• 表面过程
• 特征偏转
• 动力触探指数

Additional information

Funding

This work was supported by  Coir Board, Government  of India [No:CCRI/RES/CGT-CET/3/16/2011/0863].