Properties of soft Bangkok clay stabilized with cement and fly ash geopolymer for deep mixing application. (June 2022)

• Record Type: Journal Article
• Authors: Suksiripattanapong, Cherdsak; Sakdinakorn, Ratchanon; Tiyasangthong, Sermsak; Wonglakorn, Nattiya; Phetchuay, Chayakrit; Tabyang, Wisitsak
• Is Part Of: Case studies in construction materials. Volume 16(2022)
• Publication Date: 2022-06
• Subjects: Soft Bangkok clay -- Cement -- High calcium fly ash -- Geopolymer -- Deep mixing application; Building materials -- Case studies -- Periodicals; 691.05
• DOI: 10.1016/j.cscm.2022.e01081
• Languages: English
• ISSNs: 2214-5095

Abstract

Abstract: Deep mixing (DM) is a technique for improving the ground that has been widely used worldwide. Ordinary Portland cement (C) has historically been the most popular binder for DM application; however, utilizing C releases a large carbon footprint. This research investigates the properties of soft Bangkok clay (SC) stabilized with C and high calcium fly ash (FA) geopolymer for high-strength soil–cement columns. The effect of influence parameters on the unconfined compressive strength (UCS) and scanning electron microscope (SEM) properties of SC-C-FA geopolymer specimens was measured. The specimens had initial water contents (w) of 1LL, 1.5LL, and 2LL, FA:C ratios ranged from 100:0–70:30, and sodium silicate:sodium hydroxide ratios (NS:NH) of 50:50, 70:30, and 80:20. The results indicated that the UCS of SC-C-FA geopolymer specimens was found to increase with the increasing C content. Whereas, the UCS decreased with the decreasing NS:NH ratios. The highest 28-day UCS of the specimen was obtained with initial water content of 1.5LL, FA:C ratio of 70:30, and NS:NH ratio of 50:50. The 28-day UCSs of SC-C-FA geopolymer with all initial water contents, C content greater than 5%, and NS:NH ratio of 50:50 passed the minimum UCS requirement for soil–cement columns. Furthermore, the equations for predicting UCS and carbon emissions of SC-C-FA geopolymer are very useful for designing soil–cement columns.