Investigation on Soil Strength and Microstructure of Palm Oil Boiler Ash with Sodium Hydroxide and Sodium Silicate as Alkaline Solution

Authors

  • Atiqah Najwa Zainuddin FACULTY OF CIVIL ENGINEERING UNIVERSITI TEKONOLOGI MARA (UiTM) CWG JOHOR KAMPUS PASIR GUDANG
  • Mazidah Mukri
  • Norbaya Sidek

Keywords:

Unconfined Compressive Test, Geopolymer, Palm Oil Boiler Ash, Laterite Soil

Abstract

Palm oil boiler ash is a type of industrial waste from palm oil production, which abundantly disposed on landfill, and contaminate the soil and environment. Recently, boiler ash as a by-product is introduced as an additive in chemical stabilization, known as geopolymer. An alkaline solution functions to activate the silica-alumina structure bonding to replace the Ordinary Portland Cement in concrete application but few in soil stabilization study. This study investigates the strength of laterite with a geopolymer.  Boiler ash was chosen as source material, with sodium hydroxide and sodium silicate mixed at a ratio of 1:2. Unconfined compressive test (UCT) and SEM were conducted for laterite soil with different geopolymer percentages. The test was conducted by adding a different geopolymer percentage at 0%, 5%,10%,15%, and 20% mixed with laterite soil. The soil sample was cured for seven days for an unconfined compression test (UCT). The result shows that the highest compressive strength was obtained at 15% of geopolymer in laterite soil at 340kPa. SEM tests show that the increased compressive strength was attributable to the 15% of the geopolymer, which had a compact and dense structure and less unreacted raw materials. In conclusion, the results indicated that 15% of geopolymer gives optimum value in enhancing laterite properties' strength. The ï¬ndings support boiler ash usage as by-products in geopolymers' production for potential use in soil strength stabilization.

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Published

16-05-2022

How to Cite

Zainuddin, A. N., Mukri, M. ., & Norbaya Sidek. (2022). Investigation on Soil Strength and Microstructure of Palm Oil Boiler Ash with Sodium Hydroxide and Sodium Silicate as Alkaline Solution. International Journal of Sustainable Construction Engineering and Technology, 13(1), 57–67. Retrieved from https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/8254

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Articles