Thesis Open Access

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

Engidayu Labena Lachore


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    <subfield code="a">&lt;p&gt;deals with an alternative local waste materials of cattle bone ash and plastic&lt;br&gt;
bottle chips to improve the engineering properties of soil and minimize the environmental&lt;br&gt;
impacts. Cattle bone was burnt in open air and cooled to get bone ash (BA) and plastic&lt;br&gt;
waste bottles washed and cut into pieces to average size of 15mmx15mm. The soil sample&lt;br&gt;
was collected from the southern part of Addis Ababa around &amp;lsquo;Koye feche&amp;rsquo; and its index&lt;br&gt;
and engineering properties was carried at natural state and when stabilized with 5, 7 and&lt;br&gt;
10% of bone ash (BA) in dry weight. The California bearing ratio (CBR) test and CBR&lt;br&gt;
swell was performed with optimum BA percentage and when plastic chips (PC) added at&lt;br&gt;
0.4, 0.6 and 0.8% to the soil sample. Results of the tests showed that, the soil sample is A-&lt;br&gt;
7-5(28) and MH as per AASHTO and USCS respectively. Due to addition of bone ash, the&lt;br&gt;
plasticity index (PI), free swell, Linear shrinkage and CBR swell decreased from 45 to 27%&lt;br&gt;
,122.2 to 44.4%, 23.3 to 19.5% and 9.02 to 0.87% respectively. This shows that the&lt;br&gt;
improvement in swelling property of soil. The specific gravity of natural soil reduced from&lt;br&gt;
2.63 to 2.46 at 10 % bone ash contents. This is due to the light weight of BA. The optimum&lt;br&gt;
CBR value obtained at 7% of bone ash content, which increased 31% from the original&lt;br&gt;
soil. The result also showed, 9.8% increment in CBR value at 0.6 % PC with optimum&lt;br&gt;
bone ash content and 11.2% reduction in CBR swell at 10%PC. The improvements in CBR&lt;br&gt;
of expansive soil is adequate to use as subgrade material as per Ehiopian Road Authority.&lt;br&gt;
Both bone ash and plastic chips are a good stabilizer. Furthermore, utilizing wastes for&lt;br&gt;
geotechnical purpose creates one of alternative solid waste management.&lt;/p&gt;</subfield>
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    <subfield code="a">Bone ash, CBR, USCS, Expansive soil, Stabilization, Plastic chips</subfield>
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