Abstract
Research has been carried out on the optimization of the use of Lahat Fly Ash as an Additive Portland Composite Cement (PCC) which aims to determine the optimum conditions for adding Lahat fly ash to produce cement with physical and chemical requirements in accordance with SNI 7064:2014 and discover the ideal composition of cement with fly additions Lahat ash from various cement compositions. The quality analysis in making PCC cement is chemically in the form of Insoluble Residue (IR), Loss of Ignition (LOI), and free lime (FCaO) as well as the quality of physics in the form of Blaine, setting time, and cement mortar compressive strength. The results obtained after the process of making PCC cement with the addition of 14% Lahat fly ash, namely PCC cement in optimum conditions with physical and chemical requirements in accordance with SNI 7064: 2014 where the ideal composition of PCC cement manufacture is 14% Lahat fly ash, clinker 62%, 3% gypsum, 18% limestone, and 3% pozzolans in making PCC cement. Therefore, Lahat fly ash can be used as an alternative mixture in making PCC cement.
Highlights
In Indonesia, there are various kinds of energy sources that can be used for multiple purposes, one of which is coal
The raw materials used in the study are clinker (70%, 66%, and 62%), gypsum (3%), limestone (18%), pozzolans (3%) as the main ingredients and Lahat fly ash
Testing of Lahat fly ash is determined by the content of Loss of Ignition (LOI) and moisture content
Summary
In Indonesia, there are various kinds of energy sources that can be used for multiple purposes, one of which is coal. Fly ash is one of the waste products from coal combustion in a steam power furnace, which is round, smooth, and pozzolanic. PCC cement is made from grinding together with portland cement slag and gypsum with one or more chemical ingredients, or the result of mixing between portland cement powder with other inorganic ingredients These inorganic materials include blast furnace slag, pozzolan, silicate compounds, limestone, with a total mineral content of 6% - 35% of the PCC cement mass [7]. All results of the analysis meet SNI 2049:2015 [6] Additions of additives such as those that occur in the type of PCC cement using fly ash and trass additives can increase the compressive strength of the cement. PCC cement will be made with the addition of fly ash from the Lahat area with variations in the acquisition of Lahat fly ash by 6%, 10%, and 14% of the PCC cement mass by testing physical and chemical properties according to SNI 7064:2014
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