Open AccessOptimization of Gypsum Composition Against Setting Time And Compressive Strength In Clinker For PCC (Portland Composite Cement)
Author(s) -
Herliati,
Anggi Sagitha,
A. Dyah Puspita,
R. Puput Dwi,
Akhirudin Salasa
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1053/1/012116
Subject(s) - gypsum , portland cement , clinker (cement) , compressive strength , cement , mortar , materials science , retarder , composite number , raw material , grinding , composite material , metallurgy , chemistry , organic chemistry
Gypsum is one of the additive raw materials added to the clinker grinding process that regulate the binding time of cement or commonly known as a retarder. This research aims to observe the effect of gypsum added variation on the compressive strength of mortar and the whole quality of Portland Composite Cement at plant 14 P.T Indocement Tunggal Prakasa Tbk. The PCC compositions did prepare with a variation of the addition of 0 - 5% gypsum where the clinker ratio did fix at 75%, and two other additives, namely limestone, and trass did add with a fixed ratio of 1.2: 1. The effect of adding gypsum to clinker measured by performing a mortar compressive strength test and the binding time at the ages of 1, 3, 7, and 28 days. The results of series observation and analysis show that composite Portland cement has the most optimal quality in the addition of gypsum as much as 3.5%, where SO 3 content is 1.7%, the initial setting time is ≥ 90, and the final setting time is maximum at 375 minutes.