Pengaruh Komposisi Gypsum Terhadap Setting Time Pada Proses Produksi Semen PCC

Mala Hayati Nasution a,1,* , Nevybryanti Bunga Nurcahyo Putri a,2 , Lukmilayani Candra a,3

a Universitas Internasional Semen Indonesia, Kompleks PT. Semen Indonesia (Persero) Tbk. Jalan Veteran, Gresik 61122, Indonesia

1 mala.nasution@uisi.ac.id*; 2 nevybunga88@gmail.com; 3 lukmilayani@gmail.com;

* corresponding author

ABSTRACT

Cement is a national strategic commodity. Based on data from the Ministry of Industry of the Republic of Indonesia in 2017, the total  installed capacity of the national cement industry is 92.7 million tons  per year with a consumption rate of 65 million tons per year. The raw  materials for the cement production process are limestone, iron sand,  clay, silica sand, and gypsum. A comparison of the composition of each  raw material influences the type and characteristics of the cement  produced. Gypsum is a raw material that affects the quality of the final  cement product. Gypsum acts to regulate the hardening time and  inhibits the binding time so that it can be used for a long time. This  research was conducted to study the effect of gypsum composition on  setting time in the Portland Composite Cement (PCC) production  process. Gypsum was Tanjung Jati gypsum. Variation of gypsum  composition were 0-5% -weight. Based on SNI 15-2049-2004, the  minimum initial setting time is 45 minutes and the maximum final  setting time is 375 minutes. Based on the results of the research, PCC  cement with 0 - 5%--weight gypsum met these standards. Increased  gypsum composition causes an increase in both initial and final setting  time.

Keywords : Gypsum, Setting time, Cement, Portland Composite Cement, Hydration reaction

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