Comparison Between Cement-Rice Husk Ash and Cement-Rice Husk Ash One-Part Geopolymer for Stabilized Soft Clay as Deep Mixing Material

• Published in: Transportation infrastructure geotechnology Vol. 11; no. 4; pp. 1760 - 1776
• Main Authors: Tesanasin, Teerat, Suksiripattanapong, Cherdsak, Kuasakul, Tavorn, Thongkhwan, Thaweesak, Tabyang, Wisitsak, Thumrongvut, Jaksada, Keawsawasvong, Suraparb
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2024; Springer Nature B.V
• Subjects: Ashes; Building Materials; Carbon; Caustic soda; Cement; Clay; Compressive strength; Concrete; Engineering; Foundations; Geoengineering; Geopolymers; Geotechnical Engineering & Applied Earth Sciences; Geotechnology; Highways; Hydraulics; Hydroxides; Infrastructure; Investigations; Liquid limits; Moisture content; Pozzolans; Rice; Sodium; Sodium hydroxide; Soft clay; Technical Paper; Water content; Rice husk ash; Deep mixing; Soft Bangkok clay; One-part geopolymer; Cement
• ISSN: 2196-7202; 2196-7210
• DOI: 10.1007/s40515-023-00345-8

This study explored the potential utilization of rice husk ash (RHA) as a pozzolanic material, aiming to enhance the unconfined compressive strength (UCS) of soft Bangkok clay (SC). Various parameters were considered: SC : binder (B) of 50 : 50, water : B ratio of 1, the cement (C) : RHA ratio (ranging from 100 : 0 to 0 : 100), and initial water content ( W n ), including 1LL, 1.5LL, and 2LL, with LL representing the liquid limit of SC. The impact of solid sodium hydroxide (SH) was also assessed. The key focus was on evaluating the UCS and SEM-EDS analyses of the SC-C-RHA samples and SC-C-RHA one-part geopolymer samples. The results demonstrated that the UCS of the SC-C-RHA one-part geopolymer samples was higher than that of SC-C-RHA samples. This enhancement was attributed to the co-existing pozzolanic and geopolymerization reactions. The SEM-EDS analysis visually confirmed these improvements, revealing heightened pozzolanic and geopolymerization reactions on the sample surfaces. The 28-day UCS of the SC-C-RHA samples and the SC-C-RHA one-part geopolymer samples with SH contents of 5% and 10%, prepared with all Wn values, curing times, and C : RHA ratios lower than 30 : 70, exceeded the 1000 kPa requirement specified for deep mixing materials by the Department of Highways (DOH) in Thailand.