ABSTRACT

Coir fiber is a natural fiber extracted from the husk of coconut. Coir geotextiles made from coir fibers which are biodegradable and eco-friendly are a good alternative to polymeric geotextile. Biodegradation is a factor which limits its civil engineering applications. Hence this study is made to explore the degradation rate of coir geotextiles embedded in different soils. Coir geotextiles composed of lignocelluloses fiber found to be more durable compared to other natural geotextiles. Coir geotextiles improves the CBR values of subgrades, reduces the settlement and are effective in road pavements. But in some soil conditions, coir was powdered or decayed off. In this study, coir geotextile used in field study is embedded in five different types of soil having different compressibility characteristics and chemical constituents. The soil used in the study is collected from different test sites. . Laboratory studies were conducted and rate of degradation is reported. The embedment period is varied from 0 to 135 days. The degradation rate is evaluated by conducting wide width tensile strength test and CBR test using coir samples before and after embedment. The surface morphological characteristics of raw and degraded coir samples and chemical analysis of soil samples are also reported. From the study it is clear that coir geotextile embedded in soil from road 3 with clay of high compressibility degraded at a slower rate compared to other soils.

摘要

椰壳纤维是从椰子壳中提取的天然纤维。由可生物降解和环保的椰壳纤维制成的椰壳土工布是聚合物土工布的良好替代品。生物降解是限制其土木工程应用的一个因素。因此，本研究旨在探讨嵌入不同土壤中的椰壳土工布的降解率。与其他天然土工布相比，由木质纤维素纤维组成的椰壳土工布更耐用。椰壳土工布提高了路基的 CBR 值，减少了沉降，对道路路面有效。但在某些土壤条件下，椰壳被粉化或腐烂。在本研究中，实地研究中使用的椰壳土工布嵌入五种不同类型的土壤中，这些土壤具有不同的压缩特性和化学成分。研究中使用的土壤是从不同的测试地点收集的。. 进行了实验室研究并报告了降解率。嵌入期从 0 到 135 天不等。通过使用嵌入前后的椰壳样品进行宽幅拉伸强度测试和 CBR 测试来评估降解率。还报道了原始和降解椰壳样品的表面形态特征以及土壤样品的化学分析。从研究中可以清楚地看出，与其他土壤相比，嵌入道路 3 的土壤中的椰壳土工布具有高压缩性粘土，其降解速度较慢。通过使用嵌入前后的椰壳样品进行宽幅拉伸强度测试和 CBR 测试来评估降解率。还报道了原始和降解椰壳样品的表面形态特征以及土壤样品的化学分析。从研究中可以清楚地看出，与其他土壤相比，嵌入道路 3 的土壤中的椰壳土工布具有高压缩性粘土，其降解速度较慢。通过使用嵌入前后的椰壳样品进行宽幅拉伸强度测试和 CBR 测试来评估降解率。还报道了原始和降解椰壳样品的表面形态特征以及土壤样品的化学分析。从研究中可以清楚地看出，与其他土壤相比，嵌入道路 3 的土壤中的椰壳土工布具有高压缩性粘土，其降解速度较慢。