The amount of sugarcane bagasse in Indonesia is abundant while the utilization is still limited. One of the alternatives f i r bagasse utilization is as pulp material. To minimize the waste from the pulping process, the effect of using a chemical process (with nitric acid) and a biopulping process (using Fusarium solani) were studied and measured by the percentage of a-cellulose content in bagasse pulp. In the chemical process, the nitric acid concentration and the reaction time were varied. llre pulping process was conducted at constant temperature of 102°C and the mixture was agitated at 900 rpm. The highest percentage of a-cellulose content in pulp was 79.28%, obtained at the concentration of 3.5% for a reaction time of 3.5 hours. At higher concentrations and longer cooking times, the a-cellulose decreased due to the cellulose degradation. In the biopulping process, the incubation temperature was kept at 30°C. The highestpercentage of a-cellulose was 65.80% obtained at an incubation time of 25 days. When compared to nitric acid pulping, biopulping is less eflcient. However it has one advantage that it only uses a small amount of chemicals and, therefore, creates less pollutants.
An environmental problem that often occurs during the rainy season is standing rainwater. Therefore, some water catchment areas are needed to reduce standing water that will minimize environmental damage instead. In densely populated urban areas the available space for water infiltration is very limited. Using biopore infiltration holes’ technology which uses organic waste to increase the rate of water infiltration into the soil can be an alternative solution. This study aims to determine the effectiveness of biopore infiltration holes with organic waste treatment to increase the rate of infiltration of soil. The methodology used in this study is the Horton test, in which biopore infiltration holes are using PVC pipes with various diameter 3 in, 4 in, and 5 in. The measurement of the infiltration rate observed by decrease in water level every interval of 5 min, 10 min, 15 min, 20 min, 25 min, and 30 min continually. The results show that the effectiveness of biopore infiltration holes using PVC pipe with a diameter of 3 in, 4 in and 5 in are increasing 62.92%, 70.60%, and 54.11% respectively.
Serat polypropylene adalah jenis serat plastik dari senyawa kimia hidrokarbon (C3H6) berupa filamen tunggal atau jaringan fibrosa tipis. Campuran polypropylene fiber mesh (PFM) dan Epoxy Resin dapat meningkatkan baik kuat tekan beton ataupun fleksibilitasnya karena serat plastik dari polypropylene fiber mesh berfungsi sebagai anti crack dan mengurangi sifat getas beton mengacu ke ACI Committee 544. Variasi penambahan serat polypropylene yang digunakan dalam penelitian ini adalah 0,60 kg/m³, 0,70 kg/m³, 0,80 kg/m³, Bersama dengan tambahan Epoxy Resin 8%. Benda uji berupa balok (15 cm x 15 cm x 60 cm) sebanyak 16 spesimen dengan kuat tekan rencana f'c 25
MPa
serta faktor air semen 0,61. Standar pengujian mengacu pada SNI 7656-2012. Pengujian tekan dan lentur dilakukan pada umur 14 dan 28 hari. Hasil uji menunjukkan terjadi peningkatan kuat tekan sebesar 9,56% pada umur beton 14 hari yaitu sebesar 27,39 MPa dengan tambahan polypropylene fiber mesh 0,7 kg/m3. Sedangkan pada umur 28 hari naik sebesar 20% yaitu sebesar 30 MPa. Selain itu juga didapatkan momen lentur sebesar 11943766,2 N.mm untuk umur 14 hari dan 13246692,5 N.mm untuk umur 28 hari.
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