EFFECTS OF SILICA FUME ON PHYSICAL AND MECHANICAL PROPERTIES OF HIGH-STRENGTH CONCRETE WITH HVFA (PAITON THERMAL POWER PLANT)

Penggunaan beton sebagai bahan utama konstruksi. Saat ini diperlukan semen sebagai bahan pengikat dimana proses produksi semen melepaskan jumlah besi emisi karbondioksida (CO2) ke atmosfer. Maka dari itu, perlu dilakukan pengurangan CO2 tanpa menghilangkan fungsi sebagai bahan pengikat. Bahan alternatif yang digunakan yaitu fly ash (limbah batu bara) dan silica fume. 

Metode Eksperimen digunakan dalam penelitian ini dengan membuat benda uji yang dibuat dengan substitusi semen dengan fly ash dan silica fume untuk mengetahui sifat fisik dan mekanik (temperature hidrasi, kuat tekan beton, dan uji penyerapan air beton). Kadar variasi substitusi silica fume dimulai dari 0%, 10%, 15%, dan fly ash 50%. 

Dihasilkan data dari pengujian temperature hidrasi menunjukkan suhu paling tinggi dimiliki beton variasi 15% silica fume mencapai 41°C. Hasil uji kuat tekan beton tertinggi mencapai 56.1 MPa dimiliki beton substitusi 15% silica fume dengan umur beton 28 hari. Dan, hasil iji penyerapan air pada beton paling rendah 4% dimiliki beton dengan campuran 15% silica fume. 

Kata kunci : Silica Fume, High Volume Fly Ash, Temperature Hidrasi,  Kuat Tekan,  Penyerapan Air Beton 

The use of concrete as the main construction material currently requires cement as a binding agent, where the cement production process releases a significant amount of carbon dioxide (Co2) emissions into the atmosphere. Therefore, it is necessary to reduce CO2 emissions without eliminating the function of the binder. Alternative materials used include fly ash (a by-product of coal combustion) and silica fume.

An experimental method was used in this research by creating test specimens with cement substituted by fly ash and silica fume to determine the physical and mechanical properties (hydration temperature, concrete compressive strength, and water absorption test). The substitution variation of silica fume was set at 0%, 10%, and 15%, while fly ash was kept constant at 50%.

The hydration temperature test results showed that the highest temperature was found in the concrete with 15% silica fume variation, reaching 41°C. The highest compressive compressive strength result was 56.1 MPa, achieved by concrete with 15% silica fume at 28 days of age. Furthermore, the lowest water absorption rate of 4% was also found in the concrete with 15% silica fume mixture. 

Keywords : Silica Fume,  High Volume Fly Ash,  Temperature Hidrasi,  Compressive Strength,  Concrete Water Absorption