Pengaruh Urutan Pengadukan Pada Campuran Beton Hijau Menggunakan Agregat Kasar Buatan

Romadhona, Silvia Triariantika (2022) Pengaruh Urutan Pengadukan Pada Campuran Beton Hijau Menggunakan Agregat Kasar Buatan. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan Ground Granulated Blast Furnace Slag (GGBFS) dan Fly Ash sebagai Supplementary Cementitious Material (SCM) dalam beton merupakan salah satu inovasi untuk menghasilkan beton hijau atau beton yang ramah lingkungan. Inovasi lain untuk mengurangi penumpukan limbah fly ash adalah pemanfaatan sebagai bahan agregat kasar buatan. Penambahan mikroba dilakukan untuk meningkatkan kekuatan agregat kasar buatan, dikarenakan mikroba dapat menghasilkan enzim urease yang dapat bereaksi dengan air dan memadatkan pori-pori pasta agregat kasar buatan. Penggunaan GGBFS, Fly Ash , dan agregat kasar buatan dalam campuran beton selain memberikan pengaruh terhadap workability dan kuat tekan, tentu juga berpengaruh pada panas hidrasi dan susut beton. Urutan pengadukan juga menjadi tantangan dalam penggunaan GGBFS, Fly Ash dan agregat kasar buatan. Urutan pengadukan dapat memberikan pengaruh terhadap beton segar yang dihasilkan serta performanya. Pengujian pengaruh urutan pengadukan dilakukan untuk memperoleh urutan pengadukan yang optimum pada campuran beton hijau. Metode urutan pengadukan dilakukan pada beton normal atau beton 100% PCC, beton 50% Fly Ash, Beton kombinasi 25% Fly Ash dan 25% GGBFS, serta beton dengan 25% agregat kasar buatan yang menggantikan agregat alam. Pengujian yang dilakukan antara lain pengujian slump loss, pengujian kuat tekan, kuat tarik belah, kuat lentur, pengujian panas hidrasi dan susut beton, serta analisa secara visual pada benda uji. Hasil analisa menunjukkan bahwa urutan pengadukan berpengaruh sebesar 5% terhadap kuat tekan beton. Urutan pengadukan berpengaruh pada workability beton dilihat secara visual dan berdasarkan pengujian slump loss. Urutan pengadukan yang optimum untuk beton normal 100% PCC yaitu semen pada urutan awal, kemudian ½ dosis SP yang dicampur dengan 1/3 air, agregat kasar dan agregat halus, diikuti ½ dosis SP sisa dan air. Metode urutan pengadukan yang optimum untuk beton dengan campuran 50% fly ash, dan kombinasi 25% fly ash dan 25% GGBFS yaitu agregat kasar dan semen pada urutan awal, kemudian ½ SP dan 1/3 Air, agregat halus dan fly ash, 1/3 air dan ½ sisa SP, kemudian sisa air. GGBFS diletakkan pada urutan akhir. Pengaruh penggunaan SCM dan agregat kasar buatan dapat menurunkan 5oC panas hidrasi awal pada beton segar. Internal curing agregat kasar buatan dapat menurunkan shrinkage.
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Utilization of Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash as Supplementary Cementitious Material (SCM) in concrete is one of the innovations to produce environmentally friendly concrete. Another innovation to reduce fly ash waste is as an artificial coarse aggregate. The addition of microbes is done to increase the strength of the artificial coarse aggregate, because the microbes can produce urease enzymes that can react with water and condense the pores of the artificial coarse aggregate paste. The use of GGBFS, Fly Ash, and artificial coarse aggregate in the concrete mixture, in addition to having an effect on workability and compressive strength, also affects the heat of hydration and shrinkage of the concrete. The mixing sequence is also a challenge in the use of GGBFS, Fly Ash and artificial coarse aggregates. The order of mixing sequence can have an effect on the fresh concrete produced and its performance. Testing the effect of the order of selection was carried out to obtain the optimum mixing sequence in the green concrete mixture. The sequence method is carried out on normal concrete or 100% PCC concrete, 50% Fly Ash concrete, 25% Fly Ash and 25% GGBFS combination concrete, and concrete with 25% coarse aggregate built with natural aggregate. The tests carried out include slump loss testing, compressive strength testing, split tensile strength, flexural strength, hydration heat testing and concrete shrinkage, as well as visual analysis of the test object. The results of the analysis show that the order of stirring has an effect of 5% on the compressive strength of concrete. The order of stirring affects the workability of the concrete seen visually and based on the slump loss test. The optimum mixing sequence for normal 100% PCC concrete is cement in the initial sequence, then a dose of SP mixed with 1/3 air, coarse aggregate and fine aggregate, followed by a dose of residual SP and air. The optimum ordering method for concrete with a mixture of 50% fly ash, and a combination of 25% fly ash and 25% GGBFS is coarse aggregate and cement in the initial sequence, then SP, fine aggregate and fly ash, the rest of the SP. GGBFS is placed at the end of the sequence. The effect of using SCM and artificial coarse aggregate can reduce heat 5oC in fresh concrete. Internal curing of artificial coarse aggregate can reduce shrinkage.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Beton Hijau, Agregat Kasar Buatan, Urutan Pengadukan, Workability, Green Concrete, Slump Loss, Artificial Coarse Aggregate, Mixing Sequence.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	SILVIA TRIARIANTIKA ROMADHONA
Date Deposited:	29 Feb 2024 01:46
Last Modified:	29 Feb 2024 02:55
URI:	http://repository.its.ac.id/id/eprint/107735

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