William Wijaya
Soft clay is a soil type mostly found in Indonesia. This type of soil requires treatment because of its poor properties. These properties have a relatively low bearing capacity in water saturated conditions, high swelling potential, and high plasticity. These are several methods to improve clay soil, including soil stabilization. Soil stabilization is a method of mixing pozzolanic materials such as cement and bamboo leaf ash with the natural soil. The purpose of this addition is to reduce the characteristics of expansive clay such as high swelling potential. The research focused on the results of swelling testing using an oedometer test and was carried out using 6 sample variants using cement with a percentage of 12% of the dry mass of soil and bamboo leaf ash with a percentage of 0%, 25%, 50%, 75%, 100% of the total weight of cement used. Preliminary research is carried out before the core research. The research included examining the original soil parameters, mineral content, and pozzolanic content of bamboo leaf ash. The results of the preliminary research showed that the natural soil is classified as a high plasticity (CH) clay group and had a high potential for swelling and shrinkage. Whereas in the pozzolanic material test, bamboo leaf ash contained a chemical compound of SiO2 as much as 79.68%. Based on the results, cement and bamboo leaf ash as stabilization agents succeeded in reducing the swelling value of the soil from 15.71% to 4.33% in the S100ADB0 and 6.07% variations in S75ADB25.

Amu, O.O., and Babajide, S.S., (2011), “Ëffects of Bamboo Leaf Ash on Lime Stabilized Lateritic Soil for Highway Construction”, Research Journal of Applied Sciences, Engineering and Technology, Vol. 03, No. 04.

ASTM Standard C618-12a, (2009), Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Con-crete, ASTM, International, West Con-shohocken, PA.

Ates, A., (2016) “Mechanical properties of sandy soils reinforced with cement and randomly distributed glass fiber (GRC)”, Composites Part B, Vol. 96, 295-304.

Atterberg, A., (1911), Uber die Physikalishe Bo-denuntersuchung und uber die plastiztatder Tone, Int. Mitt. Boden, Vol. 1.

Basudewa, H.H., (1997), Studi Pengaruh Campuran Limbah

Electroplating dan Fly Ash Terhadap Kuat Tekan Bebas pada Lempung Bandung, Naskah Seminar Hasil Penelitian Tesis Magister, Bidang Pengutamaan Geoteknik, Program Pascasarjana ITB, Bandung.

Chen, F.H., (1975), Foundation of Expansive Soils, American Elsevier Science Publication, New York.

Chen, F.H., (1988), Foundation of Expansive Soil, 2nd, Ed, Development in Geotechnical Eng. Vol 54, Elsevier Science Publishing Company, Amsterdam.

Dwivedi, V.N., Singh, N., P., Das, S., S., Singh, N., B., (2006), “A New Pozzolanic Material for Cement Industry: Bamboo Leaf Ash”, International J Physic Sciences, Vol. 01, 106-111.

Hardiyatmo, H.C., (2017a), Stabilisasi Tanah untuk Perkerasan

Jalan, Edisi Ketiga, UGM Press, Yogyakarta.

Hardiyatmo, H.C., (2017b), Mekanika Tanah I, Edisi Ketujuh, UGM Press, Yogyakarta.

Hardiyatmo, H.C., (2017d), Tanah Ekspansif Permasalahan dan Penanganannya, Edisi Kedua, UGM Press, Yogyakarta.

Holtz, W.G., (1969), “Expansive Clay – Propertiesand Problems”, Colorado School of Mines Quarterly, Vol.54, No.4.

Ingles, O.G. and Metcalf, J.B., (1972), Soil Stabilization-Principles and Practice, Butterwoths, Sydney, Melbourne, Brisbane.

Ismanti, S., and Yasufuku, N., (2017), “Effect of Bamboo Leaf Ash Addition in Cemented Bamboo Chips Sand Soil Mixture”, Research Paper, Lowland Technology International, Vol. 19, Hal. 13-26.

Kementrian Pekerjaan Umum, (2005), Penanganan Tanah Ekspansif untuk Jalan Konstruksi, Direktorat Jendral Bina Marga.

Rollings, M.P., Rollings Jr, (1996), Geotechnical Materials in Construction, McGraw Hill, New Jersey, USA.

Sa’diyah, H., dkk, (2016), Ëktrasi Silikon Dioksida dari Daun Bambu, Seminar Nasional Fisika, JPFF FMIPA UNJ, Jakarta.

Soekoto, (1984), Mempersiapkan Lapisan Dasar Konstruksi, Badan Penerbit Pekerjaan Umum.

Sutiyono, H., Wardani, M., dan Sukardi, I., (1992), Teknik Budi Daya Tanaman Bambu, Pusat Penelitian dan Pengembangan Hutan, Bogor.

U.S.B.R., (1974), Earth Manual, 2nd Edition, Colorado Denver.

Wijaya, W., Ismanti. S., Rifa’I, A., (2020), “Soft Clay Improvement Using Bamboo Leaf Ash on CBR Values”, 2nd International Conference on Sustainable Infrastructure, Journal of Physics: Conference Series, Vol. 1625, No. 012007.