Fly ash is widely used as concrete’s builder because it contains quite high silica (SiO 2 ) approximately 58,20%. Fly ash can increase concrete power pressure and contains characteristic like cement. Fly ash contains low CaO approximately 3,30% so it needs other material to increase CaO on concrete. CaO found on karbit waste it contained CaO approximately 56,5%. Method of concrete making and technical feasibility test on this research use SNI standar (SNI 03-2834-2000). Environmental feasibility test use Toxicity Characteristic Leaching Procedur (TCLP) according PP No. 101 tahun 2014. The results of this research show that the use of karbit waste and fly ash can increase concrete power pressure at age of immersion 28 days. Concrete power pressure with 25% fly ash addition and carbide waste 2,5%;5%;10%; and 15% are 22,05 MPa, 19,43 MPa, 18,59 MPa, 16.09 MPa. Concrete power pressure increase 34,2%; 18,25%; dan 13,14%. Heavy metal concentration at concrete with fly ash 25% and carbide waste 2,5% ; 5%; 10% are below standard. The best composition is the mixing between 25% fly ash dan10% carbide waste which has Concrete power pressure 18,59 MPa.
<p class="E-JOURNALAbstractBody">Ekstrak daun tembakau dapat dimanfaatkan sebagai inhibitor korosi pada logam baja karbon dan aluminum di dalam larutan HCl. Penelitian ini bertujuan menganalisis pengaruh konsentrasi ekstrak daun tembakau terhadap laju korosi serta efisiensi inhibisi korosi logam baja karbon dan aluminium di dalam media larutan HCl 0,1 M. Laju korosi logam baja karbon dan aluminium dianalisis menggunakan metode polarisasi linear. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi ekstrak daun tembakau dapat menurunkan laju korosi pada logam baja karbon dan aluminium. Laju korosi minimum baja karbon dan aluminium terjadi pada konsentrasi inhibitor sebesar 700 mg/L yaitu masing-masing sebesar 0,940 mm/y dan 0,807 mm/y. Peningkatan konsentrasi inhibitor menyebabkan peningkatan efisiensi inhibisi korosi baja karbon dan aluminium. Hasil SEM menunjukkan bahwa peningkatan konsentrasi inhibitor menyebabkan proteksi korosi semakin tinggi sehingga tingkat degradasi permukaan logam akibat korosi semakin rendah.</p>
AbstrakLimbah fly ash dan sandblasting secara luas digunakan sebagai material penyusun beton karena mengandung silica (SiO 2 (SNI 03-2834(SNI 03- -2000 10%;15%; and 20% sandblasting slag are 16,32 MPa; 17,81 MPa; 18,89 MPa; and 15,24 MPa. The use of sandblasting slag and fly ash can increase compressive strength at age of immersion 28 days. Compressive strength with 5% sandblasting slag and 30% fly ash; 10% sandblasting and 25% fly ash, 15% sandblasting and 20% fly ash, and 20% sandblasting and 15% fly ash are 18,53 MPa; 16,08 MPa; 17,20 MPa; and 15,91
Palm oil refinery factory has solid waste by product called Spent Bleaching Earth (SBE). SBE consists of some chemical compounds and one of them is SiO2 up to 83,05%. SiO2 or silica fume can cause silicosis if it is exposed to the atmosphere and frequently inhaled by the workers. On the other hand, SiO2 is one of the material composition of Portland cement. Thus, it is necessary to conduct a research about the utilization of SBE. as a concrete mixture. SBE is utilized as fine aggregate substitution by the composition of 0%, 10%, 20%, 30%, and 40% of the total amount of fine aggregate. The conducted tests are fineness modulus calculation, compressive strength, setting time, and TCLP. The method used for mix design is SNI 03-2834-2000 with f’c 28,5 MPa and slump 12 ± 2 cm. This research shows that concretes with SBE substitution which achieve the planned compressive strength are 10% SBE with 34,16 MPa and 20% SBE with 29,06 MPa. Based on the TCLP test, the concentration of heavy metal substances in 10% SBE are below the standard. Thus, it is scientifically proven to conclude that concrete with 10% SBE is technically proper and safe for the environment.
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