PEMAKAIAN ABU AMPAS TEBU DENGAN VARIASI SUHU SEBAGAI SUBSTITUSI PARSIAL SEMEN DALAM CAMPURAN BETON
DOI:
https://doi.org/10.22219/jmts.v13i2.2563Abstract
PEMAKAIAN ABU AMPAS TEBU DENGAN VARIASI SUHU
SEBAGAI SUBSTITUSI PARSIAL SEMEN DALAM CAMPURAN BETON
The Use Of Bagasse Ash With Temperature Variations
As A Partial Substitution Of Cement In The Concrete Mix
Rofikotul Karimah1& Yusuf Wahyudi2
1&2Jurusan Teknik Sipil – Fakultas Teknik Univ. Muhammadiyah Malang
Jl. Raya Tlogomas No. 246 Malang 65144
Email: roikatulkarimah@gmail.com
Abstract
Bagasse is natural resource that has not been maximally used. The bagasse cinders, waste of burning was taken from Kebon Agung sugar mill, Malang, contains 38,09% amount of silica. The research toward bagasse cinder is done by reburning it from temperature 400ºC, 500ºC, 600ºC, 700ºC and 800ºC with silica amount 49,60%, 52,59%, 53,92%, 54,46% and 54,96%. Based on the research result was obtained the best press power in 28 days old is bagasse cinder which is burnt in 400ºC of temperature by 5% precentage is 24,616 Mpa. The more high burning temperature, the lower of streng that is produced. The maximum water absorption value is in a mixed-bagasse cinder that is burnt in 800ºC of temperature is 1,061%. The proportion of correlation between streng and water disorption toward mixed bagasse cinder concrete is reverse. It is because of compound establisthhment of Ca(OH)2 with SiO2 is not happened yet perfectly, portlandid fase is still exist. Consequently, the expected cinder did not exist as changer role for repairing cement feature, on the contrary, it had filler role the same as sand.
Keywords: bagasse cinder, strength, absorption.
Abstrak
Ampas tebu merupakan sumber daya alam yang masih belum maksimal pemanfaatannya. Limbah abu ampas tebu hasil sisa pembakaran yang didapat dari pabrik gula Kebon Agung, Malang memiliki kandungan silika sebesar 38,09%. Penelitian terhadap abu ampas tebu dilakukan dengan melakukan pembakaran ulang dari suhu 4000C, 5000C, 6000C, 7000C, dan 8000C dengan nilai silika yang didapat sebesar 49,60%, 52,59%, 53,92%, 54,46%, dan 54,96%. Berdasarkan hasil penelitian diperoleh kekuatan tekan yang paling baik pada umur 28 hari adalah abu ampas tebu yang dibakar pada suhu 4000C dengan persentase 5% sebesar 24,616 Mpa. Semakin tinggi suhu pembakaran kuat tekan yang dihasilkan semakin menurun. Nilai penyerapan air maksimum terdapat pada campuran abu ampas tebu yang di bakar pada suhu 8000C yakni sebesar 1,061%. Hubungan antara kuat tekan dan penyerapan air pada campuran beton abu ampas tebu berbanding terbalik. Hal tersebut terjadi karena pembentukan senyawa Ca(OH)2 dengan SiO2 belum terjadi secara sempurna, fase portlandidnya masih ada. Akhirnya abu yang dikehendaki tidak bertindak sebagai pengganti untuk memperbaiki sifat semen melainkan bertindak sebagai filler sama seperti pasir.
Kata Kunci : abu ampas tebu, kuat tekan, absorbsi.
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