Improvement of Soft Bangkok Clay using Kaolin-Quick Lime Geopolymer

Suman Manandhar; Panich Voottipruex; Siripat Maneekaew; Chairat Teerawattnasuk; Ittipon Meepon

doi:10.0001/ialt_lti.v22i3, Dec.734

Suman Manandhar Global Institute for Interdisciplinary Studies (GIIS)
Panich Voottipruex, Professor Department of Teacher Training in Civil Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok
Siripat Maneekaew, Doctoral Student Department of Teacher Training in Civil Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok
Chairat Teerawattnasuk, Associate Professor, Dr. Department of Civil and Environmental Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok
Ittipon Meepon, Lecturer, Dr. Department of Teacher Training in Civil Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok

DOI: https://doi.org/10.0001/ialt_lti.v22i3,%20Dec.734

Keywords: Soft soil Improvement, Kaolin, Quick lime, Geopolymer

Abstract

The engineering properties of C-QG geopolymer were evaluated to ascertain the viability of using this material as an embankment structure fill material and also the efficacy of geopolymer stabilization in improving mechanical behavior of soft clay. Results from strength assessments with the usage of UCS and indirect tensile strength were used to establish the performance of the C-QG geopolymer. Quicklime mixed with 6 molar NaOH gave the maximum unconfined compressive strength. q_u of the samples increases significantly to 127% as the temperature increase from 28 °C to 70 °C indicating that the optimum curing temperature was 70 °C. Elastic modulus of samples increases with curing temperature increase. The mixing ratio of C:QG 60:40 exhibited highest elastic modulus. E₅₀ increases with increasing in geopolymer content and approximately equal to 869.82qu. This secant modulus can be used for pavement design in Thailand. The highest indirect strength at all curing temperatures was obtained samples with mixing ratio of C:QG 80:20. The curing temperature increased from 28 °C to 70 °C, the indirect tensile strength increased by 50 percent indicating that the optimal curing temperature is 70 °C. The strength development from the UCS tests demonstrates the binding properties of the QG geopolymers. At curing temperature of 70 °C, the sample exhibit more particle arrangement than the sample curing under 70 °C . It can be anticipated that the curing temperature of 70 degrees is suitable for polymerization reaction.