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Utilization of plastic waste & Bone Ash to Improve the Engineering properties of Expansive soils

Engidayu Labena Lachore

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  "DOI": "10.20372/nadre/20226", 
  "abstract": "<p>deals with an alternative local waste materials of cattle bone ash and plastic<br>\nbottle chips to improve the engineering properties of soil and minimize the environmental<br>\nimpacts. Cattle bone was burnt in open air and cooled to get bone ash (BA) and plastic<br>\nwaste bottles washed and cut into pieces to average size of 15mmx15mm. The soil sample<br>\nwas collected from the southern part of Addis Ababa around &lsquo;Koye feche&rsquo; and its index<br>\nand engineering properties was carried at natural state and when stabilized with 5, 7 and<br>\n10% of bone ash (BA) in dry weight. The California bearing ratio (CBR) test and CBR<br>\nswell was performed with optimum BA percentage and when plastic chips (PC) added at<br>\n0.4, 0.6 and 0.8% to the soil sample. Results of the tests showed that, the soil sample is A-<br>\n7-5(28) and MH as per AASHTO and USCS respectively. Due to addition of bone ash, the<br>\nplasticity index (PI), free swell, Linear shrinkage and CBR swell decreased from 45 to 27%<br>\n,122.2 to 44.4%, 23.3 to 19.5% and 9.02 to 0.87% respectively. This shows that the<br>\nimprovement in swelling property of soil. The specific gravity of natural soil reduced from<br>\n2.63 to 2.46 at 10 % bone ash contents. This is due to the light weight of BA. The optimum<br>\nCBR value obtained at 7% of bone ash content, which increased 31% from the original<br>\nsoil. The result also showed, 9.8% increment in CBR value at 0.6 % PC with optimum<br>\nbone ash content and 11.2% reduction in CBR swell at 10%PC. The improvements in CBR<br>\nof expansive soil is adequate to use as subgrade material as per Ehiopian Road Authority.<br>\nBoth bone ash and plastic chips are a good stabilizer. Furthermore, utilizing wastes for<br>\ngeotechnical purpose creates one of alternative solid waste management.</p>", 
  "author": [
      "family": "Engidayu Labena Lachore"
  "id": "20226", 
  "issued": {
    "date-parts": [
  "language": "eng", 
  "title": "Utilization  of plastic waste & Bone Ash to Improve the  Engineering  properties of Expansive soils", 
  "type": "thesis"
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