Parametric study on the behaviour of bagasse ash–calcium carbide residue stabilized soil

Hatmoko, John Tri and Suryadharma, Y. Hendra (2018) Parametric study on the behaviour of bagasse ash–calcium carbide residue stabilized soil. In: The 4th International Conference on Rehabilitation and Maintenance in Civil Engineering (ICRMCE 2018), 11‐12 Juli 2018, Best Western Premier Hotel, Solo Baru, Jawa Tengah.

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Abstract

A series of experiments including unconfined compression tests, three-axial tests, compaction tests, and split tensile tests were undertaken to investigate the influence of compaction parameters on the behaviour of bagasse ash–calcium carbide residue stabilized soil. A preliminary study on soil with the addition of 4%, 6%, 8%, 10%, and 12% calcium carbide residue established that the lime fixation point (LFP) was 4%. Then 9% bagasse ash was added to soil with 4% calcium carbide residue, and the cation exchanges and pozzolanic reactions were investigated. The addition of calcium carbide residue to bagasse ash stabilized soil caused short-term changes due to cation exchange reactions, including an increase in the friction angle and cohesion in the stabilized soil. In addition, due to the short-term reaction, the maximum stiffness in three-axial tests occurred in the samples moulded with less than their optimum moisture content (OMC), whereas the peak strength occurred in the samples moulded at their OMC. After a 28-day curing period, pozzolanic reactions improved significantly the three-axial peak strength and stiffness of the stabilized soil, and the maximum three-axial shear strength and stiffness occurred in the samples prepared below their OMC.

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