Aim and objective. From the result of this research, steel slag is highly recommended to use as transport construction material due to its advantages such as environmental pollution reducing. The specific objectives of this study include: • Determination of the elemental of the steel slag samples obtained. • Determination of the engineering properties of the natural soil samples. • Determination of the compaction characteristics of the soil-steel slag mixtures. • Determination of the optimum steel-slag content (OSC) required. Significance of research. Transforming industrial wastes into valuable materials or resources for further utilization is most desirable (Aguirre et al., 2009). The rate of reuse and recycling of solid wastes/by-products has increased dramatically in the past but considerable amounts are still being disposed to landfills. Steel slag (a major waste generated when producing steel) has long been used in various applications in the construction industry such as aggregates in road construction, railway ballast and hydraulic protection structures. However, the free lime present in the steel slag causes expansion and therefore limits its application. Due to the steel slag having the presence of free lime and also the similar chemical composition and mineralogy to Portland cement; there is a great potential for furthering the usage of steel slag in the construction industry in the aspect of soil stabilization. According to Ola (1975), stabilization of soil is employed when it is more economical to overcome a deficiency in a readily available material than to bring in one that fully complies with the requirements of specification for the soil. Organic soil is one of the most readily available soil types in Vietnam. Thus, the improvement of its engineering properties (high plasticity, poor workability, low strength, high permeability, tendency to retain moisture and high natural moisture content) via its mixing with steel slag will be a double-edge achievement. The cost of treating and disposing the vast number of steel slag stockpiles in the steel producing industry will be reduced while simultaneously reducing the construction cost of borrowing suitable soil materials or using expensive stabilizers. Research methodology. The study was limited to the determination of the effect of adding 5% and 10% steel slag on the properties of soil using Modified Proctor compaction energy with respect to compaction characteristics as well as shear strength characteristic. These tests were carried out in accordance with the procedures outlined ASTM for the natural and treated soils.LIST OF ABBREVIATIONS AND ACRONYMS
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