This study aims to examine the effect of recycled Polyethylene Terephthalate (PET) artificial aggregate as a substitute for coarse aggregate on the compressive strength and flexural strength, and the volume weight of the concrete. PET plastic waste is recycled by heating to a boiling point of approximately 300°C. There are five variations of concrete mixtures, defined the percentage of PET artificial aggregate to the total coarse aggregate, by 0, 25, 50, 75 and 100%. Tests carried out on fresh concrete mixtures are slump, bleeding, and segregation tests. Compressive and flexural strength tests proceeded based on ASTM 39/C39M-99 and ASTM C293-79 standards at the age of 28 days. The results showed that the use of PET artificial aggregate could improve the workability of the concrete mixture. The effect of PET artificial aggregate as a substitute for coarse aggregate on the compressive and flexural strength of concrete is considered very significant. The higher the percentage of PET plastic artificial aggregate, the lower the compressive and flexural strength, and the volume weight, of the concrete. Substitution of 25, 50, 75 and 100% of PET artificial aggregate gave decreases in compressive strength of 30.06, 32.39, 41.73 and 44.06% of the compressive strength of the standard concrete (18.20 MPa), respectively. The reductions in flexural strength were by respectively 19.03, 54.50, 53.95 and 61.00% of the standard concrete's flexural strength (3.59 MPa). The reductions in volume weight of concrete were by respectively 8.45, 17.71, 25.07 and 34.60% of the weight of the standard concrete volume of 2335.4 kg/m3 Doi: 10.28991/cej-2020-03091626 Full Text: PDF

The Community Partnership Program (PKM) are people who are members of the Pabbata Ummi TPA Antang Foundation, which consists of Youth and Fathers groups and groups of mothers in RT 02 and 03 Tamangapa Village, Manggala District, Makassar City. The problem is: (1) constraints of knowledge and skills in processing plastic waste, especially for making paving blocks, (2) preparation of paving block manufacturing businesses. The external target is the use of plastic waste and technology that can turn it into a long-lived product so that it does not return to waste in a short time and has a high selling value so that it can improve the standard of living of citizens. The method used is: lectures, demonstrations, discussions, questions and answers, and counterpart partners. The results achieved are (1) partners have knowledge and skills in processing plastic waste, especially paving blocks, (2) partners have preparation to start a business making paving blocks.

In this study, modification of tissue culture sterilization techniques using methylisothiazolinone bocide (MB) in liquid and solid medium was used to evaluate the acquisition of axenic Casuarina equisetifolia culture in vitro with natureexplant sources. One experimental unit had 12treatment combinations with 20replications of explants in each treatment. Acquisition of the best axenic culture of C. equisetifolia after 30 days of incubation was in a sterilization combination for 3 days shaking out in liquid WPM medium with 8 mg/l MBand in solid WPM medium with 6 mg/l MB.C. equisetifoliashowsa good growth response in WPM medium without the addition of exogenous growth hormone. The first indication of axillary shoot explants were elongation response within 15 days of culture initiation. Shoot tips changed in color from dark green to a more obvious transparent green and the internode sections became swollen and barrel-shaped. Single shoot formation from axillary buds at basal nodes and sprouted lateral buds were visible within 30 days. The 90%of shoot formation in the axenic culture of Casuarina equisetifolia werefrom lateral buds.

Sekarang ini material konstruksi beton diarahkan bersifat berkelanjutan dan ramah lingkungan. Banyaknya limbah plastik yang tidak terpakai dan merusak lingkungan. Daur ulang limbah plastik menjadi agregat merupakan salah satu upaya dalam membuat material yang ramah lingkungan. Tujuan penelitian ini adalah untuk mengetahui pengaruh agregat limbah plastik PET (Polyethylene Terephthalate) sebagai pengganti agregat kasar terhadap sifat fisik (slump test, bleeding, segregation, berat isi) dan sifat mekanik kuat tekan beton. Variasi penelitian menggunakan   variasi persentase agregat limbah plastik PET (Poyethylene Terephthalate) pada campuran beton sebesar 0%, 25%, 50%,75% dan 100% terhadap volume agregat kasar pada campuran beton. Penambahan persentase agregat limbah plastik PET (Poyethylene Terephthalate) berpengaruh sangat signifikan pada nilai kuat tekan beton, semakin tinggi persentase agregat limbah plasti PET (Poyethylene Terephthalate) maka semakin rendah nilai kuat tekan beton. Menurunnya nilai berat isi, kuat tekan sangat dipengaruhi oleh bertambahnya persentase agregat limbah plastik PET (Poyethylene Terephthalate) pada beton. Kata Kunci: Poyethylene Terephthalate, Beton, Agregat Kasar, Kuat Tekan, Workability

Penelitian ini mempunyai kelebihan diantaranya mampu menjadi salah satu alternatif untuk mengurangi jumlah sampah plastik jenis PET sebagai salah satu bahan kontruksi yaitu paving block yang ramah lingkungan dan dapat digunakan sebagai pengerasan jalan, taman maupun pelataran parkir. Paving block adalah suatu komposisi bahan bangunan yang terbuat dari campuran semen portland atau bahan perekat hidrolis lainnya, air dan agregat dengan atau tanpa bahan tambahan lainnya yang tidak mengurangi mutu beton tersebut (SNI 03-0691-1996). Komposisi paving block yang akan dibuat pada karya ini terdiri dari semen portland,pasir,limbah plastik dan air sebagai campuran yang akan direncanakan pada perancangan pembuatan paving block. Masyarakat belum banyak mengetahui bahwasanya plastik juga bisa dijadikan salah satu bahan kontruksi dengan menjadi bahan tambahan. Paving block dengan plastik ini tidak bisa diragukan kekuatannya seperti paving block pada umumnya. Karena dari penelitian sebelumnya menunjukkan bahwa paving block dengan menggunakan serat yang terdapat pada plastik dapat meningkatkan kuat tekan pada paving. Hasil uji menunjukkan bahwa hasil paving block campuran 1: 3 dengan kuat tekan paving normal 18.07 Mpa dan paving block campuran 1:6 dengan kuat tekan paving normal 11.32 MPa maka dapat diperkirakan hasil narrative review yang sesuai penelitian kami adalah sebagai berikut, pada paving block komposisi 1: 4, kuat tekan target yang terjadi direncanakan sebesar 15 Mpa dan paving block kompisisi 1:5 kuat tekan target rencana direncanakan sebesar 13 Mpa dengan tingkat kepercayaan data R = 0.9798 dari penggambungan data sebelumnya,Dengan penggunaan subtitusi plastic terhadap pasir, maka ditargetkan akan terjadi peningkatan kuat tekan sebesar 30% dari paving block tanpa penggunaan plastic di komposisi subtitusi plastic sebesar 40%.Berdasarkan SNI 03-0691-1996 tentang klarifikasi mutu paving block, komposisi paving dengan subtitusi plastic 1 : 4 dan 1 : 5 cocok untuk digunakan pada taman kota dan pedestrian untuk pejalan kaki. Then, what if the plastic waste can be used. This research has advantages such as being able to be an alternative to reduce the amount of PET plastic waste as a construction material, namely paving blocks that are environmentally friendly and can be used as paving roads, parks and parking lots. Paving block is a building material composition made of a mixture of portland cement or other hydraulic adhesives, water and aggregates with or without other additives that do not reduce the quality of the concrete (SNI 03-0691-1996). The composition of the paving blocks that will be made in this work consists of portland cement, sand, plastic waste and water as a mixture that will be planned in the design of making paving blocks. People don't know much that plastic can also be used as a construction material by becoming an additional material. Paving blocks with plastic cannot be doubted as strong as paving blocks in general. This is because previous research shows that paving blocks using fibers found in plastic can increase the compressive strength of paving. The test results show that the results of a 1:3 mixed paving block with a normal compressive strength of 18.07 MPa and a mixed paving block of 1:6 with a normal compressive strength of 11.32 MPa can then be estimated that the results of a narrative review according to our research are as follows, on the paving block composition. 1: 4, the planned target compressive strength is 15 MPa and the paving block composition 1:5 is the planned target compressive strength is 13 MPa with a data confidence level of R = 0.9798 from combining the previous data. With the use of plastic substitution for sand, it is targeted to there is an increase in compressive strength of 30% from paving blocks without the use of plastic in the composition of plastic substitution by 40%. city parks and pedestrians for pedestrians.