PENGARUH SUBSTITUSI LIMBAH CANGKANG KEMIRI DAN FLY ASH TERHADAP KEKUATAN BETON
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Institusion
Institut Teknologi Perusahaan Listrik Negara
Author
Halik, Seppry Andi Purnama
Yuhanah, Tri
Yuhanah, Tri
Subject
Teknik Sipil
Datestamp
2022-09-20 06:08:44
Abstract :
Infrastructure development is currently growing very rapidly, for example in the construction of roads, bridges, buildings and so on. Until now, most of the infrastructure development in Indonesia uses concrete as a construction material. In this study, candlenut shells were used as a substitute for gravel and fly ash as a cement substitute. This study aims to determine the compressive strength, split tensile strength and absorption of each percentage of cement reduction due to fly ash substitution and the percentage of gravel reduction due to candlenut shell substitution in the concrete mixture. The test object was made with a 15 x 30 cm cylindrical mold. The percentage of gravel reduction due to candlenut shell substitution was 0%, 3%, 6%, and 9%. The percentage of cement reduction due to fly ash substitution is 30%. The number of concrete test objects made was 75 pieces. Tests were carried out at the age of 7 days, 14 days and 28 days for compressive strength and 28 days for absorption. The results of this study indicate that the use of candlenut shells can replace some of the gravel and the use of fly ash can replace some of the cement as the base material for the concrete mixture. The candlenut shell substitution of 0%, 3%, 6%, 9% and 30% fly ash produced compressive strength at 28 days of age, respectively, 25,477 MPa, 26,327 MPa, 27,082 MPa, 27,270 MPa, and 25.006 MPa. As for the split tensile strength of 2.524 MPa, 2.642 MPa, 2.713 MPa, 2.878 MPa, 2.902 MPa. The absorption is 0.328%, 0.332%, 0.485%, and 0.492%. From these results, the highest compressive strength value was obtained, namely in variations of 4 substitutions of 30% fly ash and 6% candlenut shells of 27.270 MPa. Meanwhile, the highest split tensile strength is in variation 5 with 30% fly ash substitution and 9% candlenut shell at 2,902 MPa. And the highest absorption value was found in variations of 5 substitutions of 30% fly ash and 9% candlenut shell of 0.492%.
Infrastructure development is currently growing very rapidly, for example in the construction of roads, bridges, buildings and so on. Until now, most of the infrastructure development in Indonesia uses concrete as a construction material. In this study, candlenut shells were used as a substitute for gravel and fly ash as a cement substitute. This study aims to determine the compressive strength, split tensile strength and absorption of each percentage of cement reduction due to fly ash substitution and the percentage of gravel reduction due to candlenut shell substitution in the concrete mixture. The test object was made with a 15 x 30 cm cylindrical mold. The percentage of gravel reduction due to candlenut shell substitution was 0%, 3%, 6%, and 9%. The percentage of cement reduction due to fly ash substitution is 30%. The number of concrete test objects made was 75 pieces. Tests were carried out at the age of 7 days, 14 days and 28 days for compressive strength and 28 days for absorption. The results of this study indicate that the use of candlenut shells can replace some of the gravel and the use of fly ash can replace some of the cement as the base material for the concrete mixture. The candlenut shell substitution of 0%, 3%, 6%, 9% and 30% fly ash produced compressive strength at 28 days of age, respectively, 25,477 MPa, 26,327 MPa, 27,082 MPa, 27,270 MPa, and 25.006 MPa. As for the split tensile strength of 2.524 MPa, 2.642 MPa, 2.713 MPa, 2.878 MPa, 2.902 MPa. The absorption is 0.328%, 0.332%, 0.485%, and 0.492%. From these results, the highest compressive strength value was obtained, namely in variations of 4 substitutions of 30% fly ash and 6% candlenut shells of 27.270 MPa. Meanwhile, the highest split tensile strength is in variation 5 with 30% fly ash substitution and 9% candlenut shell at 2,902 MPa. And the highest absorption value was found in variations of 5 substitutions of 30% fly ash and 9% candlenut shell of 0.492%.
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