Pengaruh Arang Tempurung Kelapa Terhadap Kuat Tekan Beton Ringan dengan Campuran Fly Ash

Purwanta, Reza Yuma (2022) Pengaruh Arang Tempurung Kelapa Terhadap Kuat Tekan Beton Ringan dengan Campuran Fly Ash. S1 thesis, Universitas Kristen Indonesia.

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Abstract

Beton adalah salah satu andalan teknik sipil dan konstruksi, digunakan dalam segala hal mulai dari gedung pencakar langit hingga jalan raya hingga jembatan hingga bendungan hingga pelabuhan. Tiga bahan utama dalam setiap batch beton adalah semen, air, dan agregat (sering juga termasuk tambahan lainnya). Sumber daya, terutama agregat halus, untuk konstruksi di wilayah pesisir masih merupakan tantangan. Tujuan dari penelitian ini adalah untuk menemukan cara membuat beton dengan berat jenis yang lebih rendah, oleh karena itu digunakan arang tempurung kelapa sebagai pengganti agregat halus beserta campuran fly ash. Silinder dengan diameter 15 cm dan panjang 30 cm digunakan untuk pengujian. Proses penelitian dimulai dengan kajian literatur dan diakhiri dengan produksi campuran beton standar dan beton menggunakan arang tempurung kelapa setelah pengujian agregat kasar (batu pecah) dan agregat halus (pasir) selesai. Pertama, ditentukan kuat tekan normal beton, kemudian ditentukan kuat tekan beton yang dibuat dengan campuran arang tempurung kelapa (10%, 12,5%, 15%, 17,5%, dan 20%) dengan menggunakan proporsi yang sama dari agregat halus (pasir) dan fly ash (10% berat semen). Hasil penelitian menunjukkan bahwa setelah 28 hari, kuat tekan beton biasa adalah 20,04 MPa, dan arang tempurung kelapa yang digunakan adalah 10%, 12,5%, 15%, 17,5%, dan 20%. Kuat tekan sebesar 16,49 MPa, 15,39 MPa, 14,57 MPa, 13,28 MPa, dan 11,48 MPa, sedangkan berat jenis mengalami penurunan masing-masing sebesar 1,62 persen, 2,60 persen, 3,62 persen, 5,22 persen, dan 7,23 persen. Kuat tekan terbaik dicapai pada persentase campuran 10% arang tempurung kelapa sebagai pengganti agregat halus, dan berat jenis terbaik dicapai pada persentase kombinasi 20% dari bahan yang sama. Dapat diketahui bahwa berat jenis beton yang dibuat dengan arang tempurung kelapa lebih rendah dibandingkan dengan beton biasa. Kata Kunci: Beton, Arang Tempurung Kelapa, Fly Ash, Kuat Tekan. / Concrete is one of the mainstays of civil engineering and construction, used in everything from skyscrapers to highways to bridges to dams to harbours. The three main ingredients in any batch of concrete are cement, water, and aggregate (often also including other additions). It is still challenging to source resources, especially fine aggregate, for construction in coastal areas. The purpose of this research was to find a way to make concrete with a lower specific gravity, therefore coconut shell charcoal was utilized as a fine aggregate replacement along with a mixture of fly ash. A cylinder of 15 cm in diameter and 30 cm in length was used for the tests. The research process began with a literature review and concluded with the production of standard concrete mixes and concrete using coconut shell charcoal after testing of coarse aggregate (crushed stone) and fine aggregate (sand) were completed. First, the normal compressive strength of concrete was determined, and then the compressive strength of concrete made with a mixture of coconut shell charcoal (10%, 12.5%, 15%, 17.5%, and 20%) was determined using the same proportions of fine aggregate (sand) and fly ash (10% by weight of cement). The results showed that after 28 days, the usual compressive strength of concrete is 20.04 MPa, and that 10%, 12.5%, 15%, 17.5%, and 20% coconut shell charcoal is used. The compressive strengths were 16.49 MPa, 15.39 MPa, 14.57 MPa, 13.28 MPa, and 11.48 MPa, while the specific gravities were reduced by 1.62 percent, 2.60 percent, 3.62 percent, 5.22 percent, and 7.23 percent, respectively. The best compressive strength was achieved at 10% mixture percentage of coconut shell charcoal as a replacement for fine aggregate, and the best specific gravity was achieved at 20% combination percentage of the same material. It can be determined that the specific gravity of concrete made with coconut shell charcoal is lower than that of regular concrete. Keywords: Concrete, Coconut Shell Charcoal, Fly Ash, Compressive Strength.

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