WAHYUDI, DIKI (2025) ANALISIS PEMANFAATAN LIMBAH GRC (GLASSFIBRE REINFORCED CEMENT) DAN FLY ASH SEBAGAI BAHAN SUBTITUSI DALAM CAMPURAN BETON. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The use of fly ash as waste from burning coal and GRC boards originating from construction project waste as a substitute material for concrete mix aims to add reference data. The research method refers to SNI 03-2834-2000 regarding procedures for making concrete mix plans, as well as the Indonesian Reinforced Concrete Regulations (PBI 1971). Variations in fly ash substitution of 10% and variations in GRC waste of 5%, 10%, 25%, 50%, and 75% with a target compressive strength f'c of 25 MPa show a decrease in compressive strength values at variations of 25%, 50%, 75 %, and 100% of the normal design compressive strength of concrete at 28 days. Meanwhile, the use of GRC substitution variations of 5% and 10% showed an increase in the compressive strength value compared to the design compressive strength of normal concrete, respectively by 21% and 9% at a concrete age of 28 days, with the highest compressive strength value reaching 30.67 MPa and 27.2 MPa. Thus, the addition of GRC waste at variations of 5% and 10% has proven to be suitable for use as a substitute for fine aggregate. The research results show that the increase in compressive strength values due to the substitution of fly ash and GRC is caused by the nature of GRC waste which comes from a cement mixture, which has the ability to bind or absorb, so it can increase the compressive strength value provided it is within certain limits. Keywords: Fly ash, GRC, Compressive Strength of Concrete, Slump Penggunaan fly ash sebagai limbah dari hasil pembakaran batubara dan papan GRC berasal dari limbah proyek konstruksi sebagai bahan subtitusi campuran beton yang bertujuan untuk menambah referensi data. Metode penelitian mengacu pada SNI 03-2834-2000 mengenai tata cara pembuatan rencana campuran beton, serta Peraturan Beton Bertulang Indonesia (PBI 1971). Variasi substitusi fly ash sebesar 10% dan variasi limbah GRC sebesar 5%, 10%, 25%, 50%, dan 75% dengan target kuat tekan f’c 25 MPa menunjukkan penurunan nilai kuat tekan pada variasi 25%, 50%, 75%, dan 100% dari kuat tekan rencana beton normal pada umur 28 hari. Sementara itu, penggunaan variasi substitusi GRC sebesar 5% dan 10% menunjukkan peningkatan nilai kuat tekan dibandingkan dengan kuat tekan rencana beton normal, masing-masing sebesar 21% dan 9% pada umur beton 28 hari, dengan nilai kuat tekan tertinggi mencapai 30,67 MPa dan 27,2 MPa. Dengan demikian, penambahan limbah GRC pada variasi 5% dan 10% terbukti layak digunakan sebagai bahan tambah pengganti agregat halus. Hasil penelitian menunjukkan bahwa peningkatan nilai kuat tekan akibat substitusi fly ash dan GRC disebabkan oleh sifat limbah GRC yang berasal dari campuran semen, yang memiliki kemampuan mengikat atau menyerap, sehingga dapat meningkatkan nilai kuat tekan dengan catatan dalam batas-batas tertentu. Kata kunci: Fly ash; GRC; Kuat Tekan Beton; Slump;
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