Optimasi Abu terbang dari PLTU Cilegon Sebagai Pengganti Klinker dalam Pembuatan Semen Portland Pozzolan

Abstract

Industri semen menyumbang emisi CO2 karena proses produksi klinker. Penggunaan klinker dikurangi untuk menurunkan emisi CO2. Salah satu pengganti klinker adalah abu terbang yang memiliki kandungan pozzolan tinggi. Penelitian ini bertujuan menentukan proporsi optimal abu terbang dan mengkaji pengaruh terhadap sifat fisika, dan kimia sebagai pengganti sebagian klinker dalam pembuatan semen portland pozzolan. Pengujian yang dilakukan, yaitu kadar hilang pijar, CaO bebas, oksida dengan XRF, bagian tak larut, total karbon, kuat tekan, dan setting time. Hasil proporsi abu terbang optimal, yaitu konsentrasi abu terbang 18% memiliki kuat tekan cukup tinggi pada umur 3, 7, dan 28 hari secara berurutan diperoleh sebesar 135, 25 kg/cm2, 208, 33 kg/cm2, dan 287,27 kg/cm2. Hasil penelitian bagian tak larut sebesar 1,48%, hilang pijar 2,27%, CaO bebas 0,65%, SiO2 23,28%, Al2O3 7,71%, Fe2O3 5,31%, CaO 54,28%, MgO 3,17%, SO3 1,84%, total karbon 0,35%, waktu ikat awal 186 menit, dan waktu ikat akhir 285 menit. Semen portland pozzolan abu terbang mengurangi emisi CO2 karena menurunkan kebutuhan klinker.

The cement industry contributed to CO2 emissions due to the clinker production process. Clinker usage was reduced to lower CO2 emissions. One of the clinker substitutes was fly ash, which had a high pozzolanic content. This study aimed to determine the optimal proportion of fly ash and to examine its effect on the physical and chemical properties as a partial replacement for clinkers in the manufacture of portland pozzolan cement. The tests conducted included measurements of loss on ignition, free CaO, oxide composition using XRF, insoluble residue, total carbon, compressive strength, and setting time. The results of the optimal fly ash proportion namely a fly ash concentration of 18%, showed a fairly high compressive strength at the ages of 3, 7, and 28 days, which were 135.25 kg/cm², 208.33 kg/cm², and 287.27 kg/cm², respectively. The results of the study showed that the insoluble part was 1.48%, loss on ignition 2.27%, free CaO 0.65%, SiO2 23.28%, Al2O3 7.71%, Fe2O3 5.31%, CaO 54.28%, MgO 3.17%, SO3 1.84%, total carbon 0.35%, initial setting time 186 minutes, and final setting time 285 minutes. Portland pozzolan cement with fly ash reduced CO2 emissions because it reduced clinker requirements.