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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 30075


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10010049
Improvement of Soft Clay Using Floating Cement Dust-Lime Columns
Abstract:
The two main criteria that control the design and performance of footings are bearing capacity and settlement of soil. In soft soils, the construction of buildings, storage tanks, warehouse, etc. on weak soils usually involves excessive settlement problems. To solve bearing capacity or reduce settlement problems, soil improvement may be considered by using different techniques, including encased cement dust–lime columns. The proposed research studies the effect of adding floating encased cement dust and lime mix columns to soft clay on the clay-bearing capacity. Four experimental tests were carried out. Columns diameters of 3.0 cm, 4.0 cm, and 5.0 cm and columns length of 60% of the clay layer thickness were used. Numerical model was constructed and verified using commercial finite element package (PLAXIS 2D, V8.5). The verified model was used to study the effect of distributing columns around the footing at different distances. The study showed that the floating cement dust lime columns enhanced the clay-bearing capacity with 262%. The numerical model showed that the columns around the footing have a limit effect on the clay improvement.
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References:

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[2] ASTM D-4595, Standard Test Method for Tensile Properties of Geotextiles by the Wide-Width Strip Method1
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[9] Mohammed Y. Fattah, A’amal A. Al-Saidi, and Maher M. Jaber, 2015,” Improvement of bearing capacity of footing on soft clay grouted with lime-silica fume mix”, Geomechanics and Engineering, Vol. 8, No. 1.
[10] McCoy, W.J. and Kriner. R.W. (1971). “Use of Waste Kiln Dust for Soil Consolidation”. Lehigh Portland Cement Co., Allentown, Pennsylvania, U.S.A.
[11] Zakariya, W. A. S., 2001, “Soil Improvement Using Stabilized and Non-Stabilized Stone Columns with Different Reinforcement Configuration,” Ph.D. thesis, Building and Construction Engineering Department, University of Technology, Iraq, p. 142.
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