A COMPARATIVE STUDY ON THE EFFECT OF SISAL FIBRE AND WASTE PLASTIC STRIPS IN STRUCTURAL STRENGTH IMPROVEMENT OF TROPICAL BLACK CLAY

Yohanna Paul, Badamasi Abdulrahman, Ishola Kazeem, Odoh Kelvin Chukwuebuka, Abdulkadir Mohammed Nyako, Fwangshak Gayus Mije
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引用次数: 2

Abstract

A study on the effect of sisal fibre and waste plastic strips on tropical black clay (also called Black cotton soil, BCS) was carried out. Tests piloted on the natural and treated soil consist of California bearing ratio (CBR), Atterberg limits and compaction for different percentages inclusion of sisal fibre (0, 0.5, 1, 1.5 and 2%) and waste plastic strips (0, 0.5, 1, 1.5 and 2%) by dry weight of soil. Results obtained showed that the liquid limit of BCS initially fluctuated between 43.4% and 55.9% at 1% sisal fibre content, then dropped to 49.4% at 2% sisal fibre content. In the case soil treated with waste plastic strips, liquid values increased from 43.4% for the natural soil to a highest value of 58% at 1% waste plastic strips and thereafter decreased to 49.15% at 2% waste plastic strips content. Plastic limit for both BCS-sisal fibre/ waste plastic strips initially decreased from its natural value of 25.78 to 15.55 and 14.77% when treated with sisal fibre and waste plastic strips respectively at 0.5% admixtures content. In the case of plasticity index, values initially increase from its natural value of 17.66% to peak values of 35.39 and 43.23% for sisal fibre and waste plastic strips treated soil respectively, and thereafter decreased. Maximum dry density (MDD) initially increased from 1.55 mg/m3 at 0%, to 1.60 mg/m3 at 0.5% and thereafter decreased to 1.53 mg/m3 at 2% of fibre content. In the case of samples treated with waste plastic strips. The MDD progressively increased as the amount of waste plastic strips increased. OMC show an overall trend of increase for BCS treated with sisal fibre, and a general trend of decrease for soil treated with waste plastic strips. The CBR values initially lessened from their natural value of 13.59% to 4.76% at 1% sisal fibre and subsequently increased to 10.57% at 2% sisal fibre. Similar behaviour was observed for soil modified with waste plastic strips. Based on the results, BCS/waste plastic strips improved the soil more than BCS/sisal fibre treated soil and is recommended at optimal 2% waste plastic strips for geotechnical engineering application such as road payment.
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剑麻纤维与废塑料条在提高热带黑粘土结构强度中作用的比较研究
研究了剑麻纤维和废塑料条对热带黑粘土(也称黑棉土,BCS)的影响。在天然和处理过的土壤上进行的试验包括加利福尼亚承载比(CBR)、阿太堡极限和压实度,以土壤干重计,不同百分比的剑麻纤维(0、0.5、1、1.5和2%)和废塑料带(0、0.5%、1、1.5%和2%)。结果表明,当剑麻纤维含量为1%时,BCS的液限最初在43.4%至55.9%之间波动,然后在剑麻纤维浓度为2%时降至49.4%。在用废塑料条处理的土壤中,液体值从天然土壤的43.4%增加到1%废塑料条时的最高值58%,然后在2%废塑料条含量时下降到49.15%。BCS剑麻纤维/废塑料带的塑性极限最初从25.78的自然值下降到15.55和14.77%,当分别用剑麻纤维和废塑料带处理时,外加剂含量为0.5%。在塑性指数的情况下,剑麻纤维和废塑料带处理土壤的值最初分别从17.66%的自然值增加到35.39%和43.23%的峰值,然后下降。最大干密度(MDD)最初从0%时的1.55 mg/m3增加到0.5%时的1.60 mg/m3,然后在纤维含量为2%时降低到1.53 mg/m3。对于用废塑料条处理过的样品。MDD随着废塑料条数量的增加而逐渐增加。用剑麻纤维处理的BCS的OMC总体呈上升趋势,而用废塑料带处理的土壤的OMC则总体呈下降趋势。在1%剑麻纤维的情况下,CBR值最初从13.59%的自然值降低到4.76%,随后在2%剑麻纤维时增加到10.57%。用废塑料条改性的土壤也观察到了类似的行为。根据研究结果,BCS/废塑料带比BCS/剑麻纤维处理的土壤对土壤的改善更大,建议在岩土工程应用(如道路付款)中使用2%的最佳废塑料带。
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