ANALISIA PENGARUH WATER/SOLID RATIO TERHADAP KUAT TEKAN DAN WORKABILITY BETON GEOPOLIMER BERBASIS FLY ASH

HIDAYAT, RIZAL (2020) ANALISIA PENGARUH WATER/SOLID RATIO TERHADAP KUAT TEKAN DAN WORKABILITY BETON GEOPOLIMER BERBASIS FLY ASH. S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

According to (Christhy Amalia Sapule, 2018), the production of concrete as a construction material commonly used in infrastructure development is one of the contributors to carbon dioxide (CO2) emissions, carbon dioxide is produced from the calcination process of cement making. It is noted that per tonne of cement produces an average of 0.77 tonnes of CO2 from the calcination process, fuel combustion and electricity consumption by chemical reactions. Davidovits (1991) and Temujiin (2010) suggest that geopolymer concrete is one of the revolutionary developments relating to new, inexpensive and environmentally friendly materials as an alternative to Portland cement. Geopolymer concrete is made without using OPC, therefore the use of geopolymer concrete does not only reduce CO2 emissions. However, geopolymer concrete also utilizes the use of residual materials such as fly ash (Hardjito et al., 2004). This research studied the effect of water solid ratio on slump value and compressive strength of geopolymer concrete. The building material for geopolymer is fly ash as a substitute for Portland cement. As an activator, it uses an alkaline liquid, namely sodium hydroxide (NaOH) with a concentration of 8 molar and sodium silicate (Na2SiO3). In this study, using a mixed design with a W / S ratio of 0.20, 0.21, 0.24, 0.26 and 0.27. Three samples were taken for each mixed design to be tested for slump and compressive strength at the age of 7, 14, and 28 days. The results showed that each increase in the W / S ratio, the slump value was higher (thinner) and the compressive strength of geopolymer concrete would decrease in compressive strength. The highest compressive strength is achieved at a W / S ratio of 0.21, which is 19.25 MPa. The greatest increase in compressive strength occurs at the age of 7 days by 50% -65% of the final compressive strength. Each increase of 0.01 W / S ratio, there will be a decrease in compressive strength of 1.06 MPa Keywords: Geopolymer Concrete, Water Solid Ratio, Fly Ash, Alkali Fluid, W / S Comparison, Slump, Compressive Strength Menurut (Christhy Amalia Sapule, 2018), produksi beton sebagai material kontruksi yang umum digunakan dalam pembangunan infrastruktur merupakan salah satu penyumbang emisi karbon dioksida (CO2), karbon dioksida dihasilkan dari proses kalsinasi pembuatan semen. Tercatat bahwa per ton semen menghasilkan rata-rata 0,77 ton CO2 dari proses kalsinasi, pembakaran bahan bakar dan pemakaian listrik dengan reaksi kimia. Davidovits (1991) dan Temujiin (2010) mengemukakan bahwa beton geopolimer merupakan salah satu perkembangaan revolusioner yang berkaitan dengan material baru yang murah dan ramah lingkungan sebagai alternatif pengganti Semen Portland. Beton geopolimer dibuat tanpa menggunakan OPC oleh sebab itu penggunaan beton geopolimer tidak hanya mengurangi emisi CO2. Namun beton geopolimer juga memanfaatkan penggunaan material sisa seperti fly ash (Hardjito et al., 2004). Penelitian ini mempelajari pengaruh water solid ratio terhadap nilai slump dan kuat tekan beton geopolimer. Material penyusun geopolimer yaitu fly ash sebagai prekursor penganti semen Portland. Sebagai aktivatornya menggunakan cairan alkali yaitu sodium hidroksida (NaOH) dengan konsentrasi 8 molar dan sodium silikat (Na2SiO3). Pada penelitian ini menggunakan desain campuran dengan perbandingan W/S yaitu 0,20, 0,21, 0,24, 0,26 dan 0,27. Setiap desain campuran diambil 3 sampel untuk diuji slump dan kuat tekan pada umur 7, 14, dan 28 hari. Hasil penelitian menunjukkan bahwa setiap peningkatan perbandingan W/S maka nilai slumpnya semakin tinggi (encer) dan kuat tekan beton geopolimer akan mengalami penurunan kuat tekan. Kuat tekan tertinggi dicapai pada perbandingan W/S 0,21 yaitu sebesar 19,25 Mpa. Peningkatan kuat tekan terbesar terjadi pada umur 7 hari sebesar 50%-65% dari kuat tekan akhir. Setiap kenaikan 0,01 rasio W/S maka akan terjadi penurunan kuat tekan sebesar 1,06 Mpa Kata Kunci : Beton Geopolimer, Water Solid Ratio, Fly Ash, Cairan Alkali, Perbandingan W/S, Slump, Kuat Tekan

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