Abstract—This research investigated compressive strength and microstructure of marginal lateritic soil stabilized with bottom ash geopolymer as a pavement material. The marginal lateritic soil (MLS) was obtained from a borrow pit in Chaiyaphum Province. Bottom ash (BA) was obtained from the Mae Moh power plant of the Electricity Generating Authority of Lampang Province. This research used the MLS:BA ratios of 70:30, 50:50 and 30:70 and Na2SiO3:NaOH ratios were 0:100, 10:90, 30:70, 50:50, 70:30 and 80:20. The test results showed that the Na2SiO3:NaOH ratios do not affect the unit weight of marginal lateritic soil stabilized with bottom ash geopolymer. The 7-day compressive strength of marginal lateritic soil stabilized with bottom ash geopolymer increases with the increase in Na2SiO3:NaOH ratio (higher Na2SiO3 content) because silica from Na2SiO3 reacts with silica and alumina from bottom ash resulting in geopolymer gel or sodium aluminosilicate hydrate (N-A-S-H). All 7-day UCS values are greater than the minimum strength requirement for UCS of 689 kPa specified by the Department of Highways, Thailand.
Index Terms—Compressive strength, microstructure marginal lateritic soil, bottom ash, geopolymer.
Cherdsak Suksiripattanapong and Jaksada Thumrongvut are with the Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Thailand (e-mail: cherdsak.su@rmuti.ac.th).
Nattiya Wonglakorn and Suppharutchaya Chongutsah are with the Department of Information and Communication Technology, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Thailand
Wisitsak Tabyang is with the Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Thailand
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Cite: Cherdsak Suksiripattanapong, Niti Tuntawoot, Jaksada Thumrongvut, Nattiya Wonglakorn, Suppharutchaya Chongutsah, and Wisitsak Tabyang, "Compressive Strength of Marginal Lateritic Soil Stabilized," International Journal of Engineering and Technology vol. 11, no. 3, pp. 177-180, 2019.
