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Journal > REKAYASA SIPIL > Kajian Kuat Tekan Beton (compressive strength) Pada Beton Dengan Campuran Abu Serabut Kelapa

 

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REKAYASA SIPIL
Vol 7, No 2 (2011)
Kajian Kuat Tekan Beton (compressive strength) Pada Beton Dengan Campuran Abu Serabut Kelapa
Alexander, Hendra ( Jurusan Teknik Sipil Politeknik Negeri Padang)
Mukhlis, Mukhlis ( Jurusan Teknik Sipil Politeknik Negeri Padang)
Article Info   ABSTRACT
Published date:
20 Mar 2012
 
Certain pollutant materials are often used for material substitution of concrete. One of them is coconut fibre ash. This material is available anywhere in Indonesia but their advantages have not been discussed as often as other concrete materials. This research employed coconut fibre ash (CFA) which initially been burned out at about 7000C for two hours. This was substituted into concrete mix at 0%, 10%, 15%, 20% and 25% by weight of cement. Concrete cylinders having 150 mm diameter and 300 mm high were used for monitoring the compressive strength at the age of 7, 14, 28, 56, 90 days. Concrete cylinders were also employed to investigate the resistance of concrete after being soaked in sulphate solution (MgSO4) for 90 days. The immersion was done after 28 days of age. Concrete cubes having 150 mm x 150 mm x 150 mm were used for absorption test after 28 days of age. From the X-Ray Diffraction test, the CFA contains pozzolanic material in term of active silica or amorphous. The Atomic Absorbtion Spectrophotometry test also indicates that the CFA contains of 42,98% silica. The cylinders with 20% CFA shows an increase of compresive strength of about 6,13% and 10,14% in comparison to the 0% CFA at 28 and 90 days of age.
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