尼日利亚阿夸伊博姆州Ntak粘土CBR和UCS值的模型预测及棕榈仁壳灰(局部稳定剂)的潜力

S. Assam, J. Agunwamba
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引用次数: 2

摘要

因此,研究棕榈仁壳灰作为局部稳定剂在稳定粘土土中的应用潜力是十分必要的。在尼日利亚和其他发展中国家,建筑材料的成本不断增加,因此需要改进对当地和现成材料的研究,以及如何将棕榈仁壳灰等当地材料转化为用于建筑和土壤改良的研究。为了达到这个目的;土壤样品采自阿夸伊博姆州的Ntak - Uyo,在AASHTO和统一分类系统上被分类为A-2-5土壤,经过筛选并通过36号筛。然后用(2-7%)棕榈仁壳灰(PPKSA)稳定干燥土壤的重量。调查包括对土壤的工程和岩土特性的评价。结果表明:当PPKSA含量增加4.5%时,混凝土的最佳含水率(OMC)提高16.74%,最大干密度(MDD)提高1.89 gm/cm3,无侧限抗压强度(UCS)提高433.12 kN/m2,未浸渍时的加州承载比(CBR)提高55%,浸渍时的CBR提高36%,而液限(LL)和塑性指数(PI)分别降低30.92%和10%。建立了预测模型,在对照试验中,这些模型与实验结果具有合理的显著性差异,实测值与预测值之间具有较强的相关性,具有较好的相关性。研究表明,PPKSA可用于改善建筑用土的性质,其中4.5%的PPKSA含量对OMC、MDD、CBR和UCS值的改善最大。
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Potentials of Processed Palm Kernel Shell Ash (Local Stabilizer) and Model Prediction of CBR and UCS Values of Ntak Clayey Soils in Akwa Ibom State, Nigeria
It is very essential to improve on the study of stabilization, as we investigate the potential of Processed Palm Kernel Shell Ash (PPKSA) as a Local stabilizer in stabilizing clay soil. The ever-increasing cost of construction materials in Nigeria and other developing countries has created the need for improved research into locally and readily available materials and also on how to convert these local materials such as Palm Kernel Shell Ash for use in construction and soil improvement. To achieve this; soil samples were collected from Ntak – Uyo, Akwa Ibom State classified as an A-2-5 soil on AASHTO and CL on UNIFIED SYSTEM of classification, were sieved and passed through sieve No. 36. It was then stabilized with (2-7%) Processed Palm Kernel Shell Ash (PPKSA) by weight of the dry soil. The investigation includes evaluation of the engineering and geotechnical properties of the soil. The results obtained shows that the increase in PPKSA content at 4.5% increase the Optimum Moisture Content (OMC) by 16.74%, Maximum Dry Density (MDD) by 1.89 gm/cm3, Unconfined Compressive Strength (UCS) by 433.12 kN/m2, California Bearing Ratio (CBR) by 55% for unsoak and 36% for soak while there was a significant reduction in the value of Liquid Limit (LL) by 30.92% and Plasticity Index (PI) by 10%. The predictive models were developed, and these models showed a good correlation with experimental results in the control tests as they possess a reasonable significant difference and a strong relationship between the measured and predicted values. The study concluded that PPKSA can be used to improve the properties of soil for construction purposes and 4.5% PPKSA content was observed to yield maximum improvement for OMC, MDD, CBR and UCS values.
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