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Egidius Salu
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PENGARUH PENAMBAHAN ABU KULIT KOPI ERMERA TIMOR-LESTE TERHADAP NILAI KUAT TEKAN BETON Trindade Maia Gutteres da Silva; Made Yani Anggreni; Egidius Salu
Jurnal Teknik Gradien Vol 15 No 01 (2023): JURNAL TEKNIK GRADIEN
Publisher : Fakultas Sains dan Teknologi Universitas Ngurah Rai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47329/teknik gradien.v15i01.1013

Abstract

One of the waste materials which used as an additive for concrete mixtures is Coffee skin ash. Coffee skin ash is the result of burning coffee skin in the coffee bean grinding process. This waste is abundant in the Municipio Ermera (one of the big District in Timor-Leste), but its very limited to use. Municipio Ermera is a land and the center of coffee plantations in Timor-Leste. For this reason, an idea about use of wasted coffee skin ash is needed without causing damage to the environment. In this study, coffee skin ash used from Ermera area with a ratio of 0%, 5%, 10%, and 15% from cement weight. The purpose of this study to find how to compare the compressive strength of concrete between normal concrete and added coffee skin ash from Ermera. This method used in this study is experimental study and for each classification were made 5 specimens. The results of this research and analysis it can be concluded the compressive strength value of concrete using coffee skin ash as a partial replacement for cement composition with normal concrete has a significant comparison. Where it was found that concrete using coffee skin ash with composition of 5%, 10%, and 15% had a higher compressive strength value to concrete without coffee skin ash. The comparison of the increase in compressive strength that occurs is around 16% to 19,6%.
ANALISA PERBEDAAN PENGGUNAAN PASIR SEBAGAI AGREGAT HALUS TERHADAP NILAI KUAT TEKAN BETON (Pasir Sungai lau-Hata Liquica dan Laklo Liquica dengan Kuat Tekan Beton Rencana 25 MPa dan 30 MPa) Martinho Madeira Soares; Made Yani Anggreni; Egidius Salu
Jurnal Teknik Gradien Vol 15 No 01 (2023): JURNAL TEKNIK GRADIEN
Publisher : Fakultas Sains dan Teknologi Universitas Ngurah Rai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47329/teknik gradien.v15i01.1016

Abstract

Sand from Lau-Hata and Laklo rivers is widely used as a concrete mixture for construction by the community, there are buildings, highways, and culverts. However, research on the quality and specifications of these aggregates is still minimal. For this reason, in this study an analysis and experimental was attempted on the use of fine aggregate from Lau-Hata and Laklo river as a filler in the concrete mix. The purpose of this study was to find out how to compare aggregate specifications from the Lau-Hata and Laklo river and how the results of the compressive strength value of concrete. Experimental study method applied in this study. And conducted a comparative test of the specifications of fine aggregate from Lau-Hata and Laklo river. This study only to know the specifications of fine aggregates and trying to determine the quality of the concrete produced by the use of these filler with compressive strength value. The result of the research, these fine aggregates can be used as concrete filler but it’s just need special treatment such as washing the sand first to reduce silt content. The result of the compressive strength of concrete obtained and have similar value with compressive strength design. From design 25 MPa and 30 MPa, the concrete using Lau-Hata sand produce compressive strength of 25,6 MPa and 30 MPa. And concrete using Laklo sand produce compressive strength of 25,7 MPa and 30,5 MPa.
Co-Authors Made Yani Anggreni Martinho Madeira Soares Trindade Maia Gutteres da Silva