Fathonah, Woelandari and Intari, Dwi Esti and Mina, Enden and Kusuma, Rama Indera and Maryam, Eryani Siti (2021) Comparative analysis of increasing CBR value of soil with adding bamboo leaf ash. Teknika Jurnal Sains dan Teknologi, 17 (2). pp. 277-280. ISSN 1693-024X (print version), E-ISSN: 2654-4113 (online version)

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Abstract

Consider the importance of the subgrade strength in road building since its strength impacts the soil's performance in absorbing the load on it. One of the efforts to improve the subgrade, which has a low bearing capacity, is by stabilizing the soil using bamboo leaf ash. This study aims to analyze the increase in CBR value with the addition of bamboo leaf ash. The analysis results showed that bamboo leaf ash from the furnace combustion process with a temperature range of 800O-1000 OC produced a higher CBR strength value than bamboo leaf ash from ordinary combustion without a furnace. The result is the higher silica content in the bamboo leaf ash from the furnace combustion process. This silica has pozzolanic and selfcementing properties, namely the ability to harden and increase strength when reacted with water. The addition of bamboo leaf ash with ordinary burning resulted in the optimum CBR value at seven days of curing of 13.1 % at 10 % bamboo leaf ash variation. At the same time, bamboo leaf ash with Furnace combustion resulted in optimum CBR values of 34.99 % and 38.21 % at 6% variation of bamboo leaf ash.

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