Studi Eksperimental Pengaruh Variasi Kadar Fly Ash Dan Rasio Air-Pengikat (w/b) Terhadap Perilaku Mekanis Pada Beton High Volume Fly Ash (HVFA) Mutu Tinggi

Fadhillah, Moch Rifan (2026) Studi Eksperimental Pengaruh Variasi Kadar Fly Ash Dan Rasio Air-Pengikat (w/b) Terhadap Perilaku Mekanis Pada Beton High Volume Fly Ash (HVFA) Mutu Tinggi. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan semen Portland dalam jumlah besar pada beton berkontribusi terhadap konsumsi energi dan emisi karbon, sehingga diperlukan alternatif bahan pengikat yang lebih berkelanjutan. Salah satu upaya yang dapat diterapkan adalah penggunaan fly ash dalam kadar tinggi melalui beton High Volume Fly Ash (HVFA). Namun, peningkatan kadar fly ash dapat memperlambat perkembangan sifat mekanis, terutama pada umur awal. Penelitian ini bertujuan menganalisis perbedaan kelecakan, kuat tekan, hubungan tegangan-regangan, dan modulus elastisitas beton HVFA mutu tinggi berdasarkan variasi kadar fly ash, rasio air-pengikat, dan media perawatan. Variasi campuran menggunakan kadar fly ash 60% dan 70% dari massa total bahan pengikat serta rasio air-pengikat 0,25 dan 0,20. Benda uji silinder berdiameter 100 mm dan tinggi 200 mm dirawat dalam air biasa dan air kapur. Pengujian slump mengacu pada ASTM C143/C143M, pengujian kuat tekan umur 7 dan 28 hari mengacu pada ASTM C39/C39M, sedangkan modulus elastisitas statis ditentukan berdasarkan ASTM C469/C469M. Hubungan tegangan-regangan diperoleh melalui pengujian Universal Testing Machine dan dibandingkan dengan model konstitutif sebagai kurva analitis pembanding. Hasil pengujian menunjukkan nilai slump sebesar 120-200 mm. Penurunan rasio air-pengikat dari 0,25 menjadi 0,20 menurunkan nilai slump, sedangkan peningkatan kadar fly ash dari 60% menjadi 70% menghasilkan nilai slump yang lebih tinggi. Kuat tekan rata-rata umur 28 hari berada pada rentang 42,31-65,40 MPa. Perawatan air kapur menghasilkan kuat tekan lebih tinggi daripada air biasa pada seluruh variasi, dengan peningkatan sebesar 6,6-35,6%. Variasi HVFA 60 R2-AK dan HVFA 70 R2-AK mencapai kuat tekan rencana 60 MPa, masing-masing sebesar 65,40 MPa dan 63,11 MPa. Tegangan puncak hasil UTM berada pada rentang 37,73-69,52 MPa, sedangkan modulus elastisitas rata-rata hasil Besmak berada pada rentang 20,03-37,10 GPa. Berdasarkan kriteria gabungan beton segar dan beton keras, HVFA 60 R2-AK merupakan kombinasi yang paling memenuhi sasaran penelitian dengan slump 120 mm, kuat tekan 28 hari 65,40 MPa, tegangan puncak UTM 68,20 MPa, dan modulus elastisitas 33,07 GPa.
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The extensive use of Portland cement in concrete contributes to energy consumption and carbon emissions, highlighting the need for more sustainable binder alternatives. One potential approach is the use of high fly ash contents in High Volume Fly Ash (HVFA) concrete. However, increasing the fly ash content may slow the development of concrete mechanical properties, particularly at early ages. This study aims to analyze the workability and mechanical behavior of high-strength HVFA concrete based on variations in fly ash content, water-to-binder ratio, and curing medium. The mixtures incorporated fly ash contents of 60% and 70% by total binder mass with water-to-binder ratios of 0.25 and 0.20. Cylindrical specimens measuring 100 mm in diameter and 200 mm in height were cured in normal water and limewater. The slump test was conducted in accordance with ASTM C143/C143M, compressive strength tests at 7 and 28 days were conducted in accordance with ASTM C39/C39M, and the static modulus of elasticity was determined in accordance with ASTM C469/C469M. Stress-strain relationships were obtained using a Universal Testing Machine and compared with the constitutive model as an analytical reference curve. The test results showed slump values ranging from 120 to 200 mm. Reducing the water-to-binder ratio from 0.25 to 0.20 decreased the slump, whereas increasing the fly ash content from 60% to 70% produced higher slump values. The average 28-day compressive strength ranged from 42.31 to 65.40 MPa. Limewater curing produced higher compressive strength than normal-water curing for all mixtures, with increases ranging from 6.6% to 35.6%. The HVFA 60 R2-AK and HVFA 70 R2-AK mixtures achieved the target compressive strength of 60 MPa, reaching 65.40 and 63.11 MPa, respectively. The peak stress obtained from the UTM ranged from 37.73 to 69.52 MPa, while the average modulus of elasticity obtained from the Besmak testing machine ranged from 20.03 to 37.10 GPa. Based on the combined fresh- and hardened-concrete criteria, HVFA 60 R2-AK was the mixture that most closely met the research objectives, with a slump of 120 mm, a 28-day compressive strength of 65.40 MPa, a UTM peak stress of 68.20 MPa, and a modulus of elasticity of 33.07 GPa.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	HVFA mutu tinggi, kadar fly ash, kuat tekan, perilaku mekanis, rasio air-pengikat, high-strength HVFA concrete, fly ash content, compressive strength, mechanical behavior, water-to-binder ratio
Subjects:	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 > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Moch Rifan Fadhillah
Date Deposited:	04 Aug 2026 04:47
Last Modified:	04 Aug 2026 04:47
URI:	http://repository.its.ac.id/id/eprint/142517

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