Unconfined compressive strength of subgrade stabilized with coconut shell ash and lime in variation to curing time

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Author: Ramli R.; Al Aiman Abdul Halim M.; Mansor S.
• Format: Conference paper
• Language: English
• Published: Institute of Physics 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85198479797&doi=10.1088%2f1755-1315%2f1369%2f1%2f012029&partnerID=40&md5=4b6172f72396b647a3e16cdae7c2779c

Many construction projects have encountered issues where the soil does not meet the necessary specifications for use as a subgrade layer. The high compressibility and low shear strength of these soils can lead to significant distortion when exposed to traffic loads. To address these issues, this study evaluated the impact of using natural additives namely coconut shell ash (CSA) admixed with lime. The research looked at how different types of treated soil and the quantity of chemicals used impacted the effectiveness of these additives. Variation portions of 2 %, 4 %, 6 %, 8 % and 10 % CSA with a constant 6% lime were used in the investigation. The study also examined how different variations of CSA and lime impacted the soil's mechanical properties. Unconfined compressive strength (UCS) test was incorporated with curing times of 7, 14 and 28 days. The study's results found that using a combination of CSA and lime effectively improved the soil's strength and durability. It conclusion, treated soil admixed with 6 % CSA and 6 % lime significantly improved the UCS as the value achieved 230.82 kN/m2 at 7 days. It's proven that untreated soil is more susceptible to water compared to treated soil. © 2024 Institute of Physics Publishing. All rights reserved.