Studi Beton Mutu Tinggi Dengan Penggunaan Fly Ash Sebagai Bahan Substitusi

Ismaniza, Yusanani (2025) Studi Beton Mutu Tinggi Dengan Penggunaan Fly Ash Sebagai Bahan Substitusi. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 2035211043-Undergraduate_ Thesis.pdf - Accepted Version Restricted to Repository staff only Download (7MB) | Request a copy

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan fly ash sebagai bahan substitusi sebagian semen dalam pembuatan beton mutu tinggi. Latar belakang penelitian didasari oleh kebutuhan akan beton yang memiliki kekuatan tekan tinggi namun tetap ekonomis dan ramah lingkungan. Penggunaan semen dalam jumlah besar berdampak negatif terhadap lingkungan, terutama emisi CO₂, sehingga substitusi dengan fly ash menjadi alternatif yang menarik. Fly ash tipe F dari PLTU Paiton digunakan dalam variasi persentase 0%, 30%, 40%, dan 50% terhadap total bahan pengikat.
Penelitian dilakukan dengan metode eksperimental, dimulai dari pengujian karakteristik material, perhitungan mix design, pembuatan dan perawatan benda uji, serta pengujian kuat tekan, workability, resistivitas, dan UPV (Ultrasonic Pulse Velocity). Penambahan superplasticizer tipe F dilakukan untuk menjaga workability meskipun rasio air-bahan pengikat diturunkan hingga 0,22. Komposisi campuran yang digunakan pada variasi HSCFA0 sebagai beton kontrol terdiri dari pasir sebanyak 700 kg/m³, kerikil dengan ukuran 5–10 mm sebesar 1179,22 kg/m³, semen sebanyak 594 kg/m³, air sebanyak 128,80 kg/m³, serta bahan tambahan superplasticizer sebesar 1,5% dari berat semen. HSCFA30 terdiri dari pasir sebanyak 700 kg/m³, kerikil dengan ukuran 5–10 mm sebesar 1179,22 kg/m³, semen sebanyak 415,58 kg/m³, air sebanyak 128,80 kg/m³, serta bahan tambahan superplasticizer sebesar 1,5% dari berat binder. HSCFA40 terdiri dari pasir sebanyak 700 kg/m³, kerikil dengan ukuran 5–10 mm sebesar 1179,22 kg/m³, semen sebanyak 356,40 kg/m³, air sebanyak 128,80 kg/m³, serta bahan tambahan superplasticizer sebesar 1,5% dari berat binder. HSCFA50 terdiri dari pasir sebanyak 700 kg/m³, kerikil dengan ukuran 5–10 mm sebesar 1179,22 kg/m³, semen sebanyak 297 kg/m³, air sebanyak 128,80 kg/m³, serta bahan tambahan superplasticizer sebesar 1,5% dari berat binder. Dengan hasil kuat tekan rata-rata berturut-turut pada umur 28 hari yaitu 48,34 MPa; 41,68 MPa; 66,76 Mpa; dan 35,40 MPa.
Hasil penelitian menunjukkan bahwa substitusi fly ash sebesar 40% memberikan hasil optimum dengan kuat tekan sebesar 66,76 MPa pada umur 28 hari dan slump 140 mm. Selain itu, nilai resistivitas beton pada variasi HSCFA40 tergolong dengan tingkat korosifitas rendah yaitu 73 kΩ·cm. Sama halnya dengan nilai UPV yang diperoleh variasi HSCFA40 yaitu, 4971,25 m/s yang masuk dalam klasifikasi beton istimewa. Dari segi biaya, penggunaan fly ash mampu mengurangi penggunaan semen hingga 40%, yang berarti efisiensi ekonomi dapat dicapai tanpa mengorbankan mutu.
========================================================================================================================
This study aims to investigate the effect of using fly ash as a partial substitute for cement in the production of high-strength concrete. The background of this research is based on the need for concrete with high compressive strength that remains both economical and environmentally friendly. The large volume of cement used in construction has a negative environmental impact, particularly due to CO₂ emissions, making fly ash substitution an attractive alternative. Type F fly ash from the Paiton Power Plant was used in substitution percentages of 0%, 30%, 40%, and 50% of the total binder content.
The research was conducted using an experimental method, beginning with material characterization tests, mix design calculations, specimen casting and curing, followed by testing for compressive strength, workability, resistivity, and Ultrasonic Pulse Velocity (UPV). A type F superplasticizer was added to maintain workability even though the water-to-binder ratio was reduced to 0.22. The mix composition for the HSCFA0 variation, which served as the control concrete, consisted of 700 kg/m³ of sand, 1179.22 kg/m³ of gravel (5–10 mm in size), 594 kg/m³ of cement, 128.80 kg/m³ of water, and 1.5% superplasticizer by weight of cement. HSCFA30 comprised 700 kg/m³ of sand, 1179.22 kg/m³ of gravel (5–10 mm), 415.58 kg/m³ of cement, 128.80 kg/m³ of water, and 1.5% superplasticizer by weight of binder. HSCFA40 included 700 kg/m³ of sand, 1179.22 kg/m³ of gravel (5–10 mm), 356.40 kg/m³ of cement, 128.80 kg/m³ of water, and 1.5% superplasticizer by weight of binder. HSCFA50 consisted of 700 kg/m³ of sand, 1179.22 kg/m³ of gravel (5–10 mm), 297 kg/m³ of cement, 128.80 kg/m³ of water, and 1.5% superplasticizer by weight of binder. With the average compressive strength results at 28 days being 48.34 MPa, 41.68 MPa, 66.76 MPa, and 35.40 MPa, respectively.
The results showed that a 40% fly ash substitution produced the optimum performance, achieving a compressive strength of 66.76 MPa at 28 days and a slump of 140 mm. In addition, the concrete resistivity value for the HSCFA40 variation indicated a low level of corrosivity at 73 kΩ·cm. Similarly, the UPV value obtained from the HSCFA40 variation was 4971.25 m/s, which falls under the category of excellent concrete quality. A positive correlation was also found between UPV values and compressive strength. In terms of cost, the use of fly ash reduced cement consumption by up to 40%, indicating that economic efficiency can be achieved without compromising concrete quality.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Beton Mutu Tinggi, Fly ash, Kuat Tekan, Workability, Durabilitas, Efisiensi Biaya, High Strength Concrete, Fly Ash, Compressive Strength, Workability, Durability, Cost Efficiency
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. T Technology > TA Engineering (General). Civil engineering (General) > TA439 Lightweight concrete. High strength concrete. T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction T Technology > TD Environmental technology. Sanitary engineering > TD427.F58 Fly ash
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Yusanani Ismaniza
Date Deposited:	04 Aug 2025 02:38
Last Modified:	04 Aug 2025 02:38
URI:	http://repository.its.ac.id/id/eprint/125971

Actions (login required)

View Item