Limbah cangkang kepah dan kaca selama ini merupakan jenis limbah yang sampai saat ini tidak memiliki nilai ekonomis. Potensi cangkang kepah di wilayah pesisir Kalbar yang memiliki garis pantai yang panjang (1136 km) merupakan peluang yang harus bisa dimanfaatkan seoptimal mungkin. Demikian pula dengan limbah kaca di Kalbar yang sampai saat ini belum pernah didaur ulang kembali menjadi sesuatu yang bermanfaat. Penelitian ini mencoba memanfaatkan kedua limbah tersebut agar memilik nilai dan kegunaan bagi masyarakat, yaitu dengan mengolahnya menjadi semen alternatif.Sebagaimana diketahui, cangkang kepah dan kaca memiliki senyawa yang sama dengan senyawa pembentuk semen. Cangkang kepah mengandung senyawa CaCO3 sedangkan kaca mengandung SiO2. Penelitian ini mencoba mengolah limbah cangkang kepah, limbah kaca, serta material tambahan yaitu tanah liat (clay) yang mengandung Al2O3 dengan proporsi campuran 80% : 5% : 15%. Proses pengolahan mencoba mengikuti proses pembuatan semen biasa walaupun menggunakan peralatan yang sederhana. Seluruh material harus dicampur dan dihaluskan semaksimal mungkin kemudian dibakar pada suhu 15000 C selama kurang lebih 15 jam. Hasil pembakaran berupa klinker kemudian ditumbuk dan disaring menggunakan saringan no.200. Hasilnya berupa serbuk semen alternatif yang akan digunakan untuk mensubstitusi jumlah semen untuk pembuatan benda uji beton, yaitu sebesar 0%, 10%, 20%, dan 30%. Mutu beton f’c direncanakan sebesar 25 MPa. Perancangan Job mix beton menggunakan metode ACI. Hasil pengujian terhadap variasi campuran semen 0%,10%,20%,30% adalah; setting time untuk menentukan waktu ikat adalah 4 jam 54 menit,4 jam 20 menit,3 jam 18 menit,2 jam 36 menit, batas minimal setting time adalah 45 menit sehingga waktu ikat semua variasi semen memenuhi syarat; nilai Slump adalah 8 cm;9,3 cm;10,5 cm;dan 11,5 cm, nilai slump sesuai dengan perencanaan; daya serap air sebesar 0,534%;0,570%; 0,769%; 1,163%; berat volume beton segar sebesar 2,46 t/m3;2,366 t/m3;2,498 t/m3; 2,423 t/m3 ; f’c beton usia 3 hari sebesar 11,149 MPa;10,889 MPa; 10,678 MPa;10,117 MPa dengan angka korelasi terhadap f’c beton normal 28 hari adalah 0,396;0,387;0,38;0,360; f’c beton usia 7 hari sebesar 18,494 MPa ;17,489 MPa;16,331 MPa;16,124 MPa dengan angka korelasi adalah 0,658;0,622;0,581;0,573; f’c usia 28 hari sebesar 28,122 MPa; 26,482 MPa; 25,057 MPa; 23,291 MPa dengan angka korelasi adalah 1,00;0,942; 0,891; 0,832; nilai f’ct sebesar 5,427 MPa;4,43 MPa;4,1 MPa; 3,257 MPa; dengan angka korelasi terhadap f’c beton normal 28 hari adalah 0,193;0,158;0,146;0,081. Secara keseluruhan hasil pengujian menunjukkan hasil yang cukup baik, walaupun ada sedikit yang di bawah perencanaan, namun selisihnya relatif kecil. Untuk ke depan, dapat dilakukan penelitian lanjutan untuk meningkatkan dan memperbaiki hasil penelitian ini.Kata kunci : semen, cangkang kepah, kaca.
The use of concrete for various building constructions has been widely used, both as a building structure and also for transportation purposes, especially for concrete roads. Nanga Jemah Village is one of the villages located in Boyan District, Kapuas Hulu Regency which has potential in the field of building materials. The use of aggregates originating from Nanga Jemah has often been done, but until now no one has investigated this type of aggregate as a concrete-forming material, especially for the manufacture of concrete rebate roads. The aggregates used in this study are aggregates derived from Nanga Jemah, both fine aggregates and coarse aggregates by comparing the use of commonly used materials. The purpose and objective of this research are to develop the potential of the area in the form of materials originating from the village of Nanga Jemah so that they can be used as concrete-forming materials, especially for the construction of the Rabat Beton road.
The use of SCC (Self Compactibility Concrete) concrete in Indonesia is increasing in the field, especially for a variety of buildings that require large compaction speeds or use concrete that can compact itself. SCC Concrete Technology in the construction industry is growing, especially in meeting the needs of the construction world. Added material is an alternative material used to increase the strength characteristics of the concrete. Likewise the addition of glass powder waste, and bauxite waste in making SCC concrete is expected to increase the compressive strength concrete. Fresh concrete, which belongs to the self-compacting concrete (SCC) group, has a very high slump value (more than 20 cm), so measurements with cone abrams are no longer effective. The use of these materials as substitute materials and added based on the thought to utilize glass waste and , bauxite waste in order to reduce the impact of environmental pollution and provide economic value. This study uses glass powder as glass waste and bauxite waste as added material for cement. This study uses four kinds of mixed compositions, namely 0% (ordinary concrete); 2.5% mixture; 5% and 7.5% by weight of cement as added material from glass waste and bouksit waste, where each composition consists of 3 cylindrical specimens with a diameter of 15 cm and a height of 30 cm. Until now there has never been any research from mananpun to test the 2 (two) mixtures, therefore we want to test it so that glass waste and bauxite waste are not wasted and can be reused, especially in making SCC concrete. From the research results it was found that the maximum slum cone test results were in the 2.5% variation that is equal to 44.3 cm, while the minimum at 0% was 29.3 cm. The maximum compressive strength at the age of 3 days is 455,418 kg / cm2 for variations of 7.5% while the minimum is at a variation of 2.5% of 200.469 kg / cm2 at 7 days of concrete.
As a result of the COVID-19 Pandemic Outbreak, proper living for slum dwellers has become increasingly difficult, the income level of the population has decreased so that areas where slum areas were not identified at first may increase the spread of their territory. According to the Decree of the Regent of Sambas Number 872 / BAPPEDA of 2014 concerning the Determination of the Location of Housing and Slum Settlements in Sambas Regency, the slum settlement area covering an area of 75.77 ha is spread over 3 sub-districts covering 4 villages. Namely Pendawan Village, Tanjung Bugis Village in Sambas District, Penjajab Village, Penjajab District and Sekura Village, Sekura District. Of the 4 villages that occupy the largest area for slum areas is Tanjung Bugis Village with an area of 23.05 ha (30.42%). This study aims to identify the factors that cause slum areas in Sambas Regency, identify facilities and infrastructure, especially environmental roads, garbage, wastewater and housing, analyze the needs for facilities and infrastructure from the data obtained in the form of roads, to, clean water and housing. This research was conducted deductively, so that the researchers departed from theory to go into the field in conducting data searches which were then expected to analyze the facilities and infrastructure needs of the slum area in Sambas City. .From the results of this study, it is found that the factors that cause slum are insufficient income of Rp. 500,000 - Rp. 1,000,000.00, the last education is very low elementary school (elementary school) and the number of families between 3-5 people. Meanwhile, from the analysis of the need for facilities and infrastructure, appropriate technology is needed for community water sources that still use public taps, environmental roads use concrete rebates but many are still damaged, drainage channels are not there if the water is not smooth or jammed while the trash can is not owned, especially TPS (Temporary Disposal Site) for garbage.
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