Abstract
Compactness is an important feature to ensure subgrade stability where temperature and water infiltration exist in semi-arid areas. Chemical soil stabilization can improve soil properties. This research studies the impact of compaction energy on stabilized subgrade soil and how to improve its geotechnical characteristics in the experimental tests on both unstabilized and stabilized soil samples by adding ordinary Portland cement and sulfate-resistant cement, in percentages by the soil's weight, in order of identification and classification, to the strength properties tests: compaction at multiple energies, CBR, and UCS. A test protocol was followed to assess the relationship between cement soil treatment, mechanical characteristics, and compaction parameters at different energy levels. Findings show that the higher UCS values were recorded with an increase in compaction energy. The MDD of cement stabilized soil increases as compaction energy increases, whereas the OMC decreases, the UCS improves, and the CBR increases. These improvements have a positive influence on the performance of soil used as a subgrade. The combination of cement stabilization and a high compaction level for subgrades using weak soil can improve strength parameters throughout any phase of earthwork construction design that leads to strengthening subgrades, reducing the thickness, and, as a result, low construction cost. Doi: 10.28991/CEJ-2022-08-03-012 Full Text: PDF
Highlights
Soil compaction is an essential aspect of civil engineering work
In the case of Sulphate resistant cement (SRC), it was observed that the gain in water is strongly related to the cement compared to the OPC
Cement treatment improves the performance of arid areas' soils, allowing them to be used in their place without having to replace them
Summary
Soil compaction is an essential aspect of civil engineering work. Many engineering structures, such as highway embankments and earth dams, require soil compaction to improve mechanical properties. Findings show that using a binder mixing of Portland cement (ordinary) 8%, kaolin 2%, and silica sand 5%, the direct shear tests, CBR value, and UCS of the treated soil increased. They have shown that stabilized soils with binder compositions of cement 8%, Kaolin 2%, and silica sand 5% have superior engineering properties than samples stabilized with lower kaolin amounts (i.e., < than 2%). Literature suggests that understanding the strength and performance behavior of soil treated with any new stabilizer compacted to various energy levels is necessary This present work represents in a part an overview of the particularities of cement soil treatment effect. Minimize the irrational use of water, in areas where the climate is arid, and where it is preferable to preserve water resources for the resident’s benefit
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