Optimization of using Baturaja fly ash as a Portland Composite Cement (PCC) additive

Abstract

There has been researched on the optimization of fly ash Baturaja as a cement additive PCC. The purpose of this research is to know the optimal percentage of fly ash, which can be added to the process of making PCC cement, which still produces excellent quality cement and fulfills SNI and knowing the effect of adding fly ash to physical testing and chemical testing. The test was done physically, Blaine test, setting time test and compressive strength test for three days, seven days, and 28 days. Meanwhile, chemical testing is the Loss of Ignition (LOI) test, Free Calcium Oxide (FCaO) test, and Insoluble Residue test (IR). Based on the result of research, the most optimal percentage is when adding 6% ash fly proportion. The higher the ratio of fly ash, will result in an unstable Blaine value. The higher the proportion of fly ash is added, the compressive strength will be smaller, and the setting time will be longer. Meanwhile, the higher the addition of fly ash, the value of loss of ignition, Free Calcium Oxide, and insoluble residue value will be higher.

Stabilization of Soft Clay from Bukit Rawi using Portland Composite Cement

“…The addition of 4% Napa soil resulted in optimum behavior and fulfilled the requirements of SNI 7064 [15]. Rumiyanti et al [16] found the percentage addition of Lahat fly ash optimum at 14%, clinker at 62%, 3% gypsum, 18% limestone, and 3% pozzolans in the manufacture of PCC. A specifically formulated PCC can also contribute to remediating a saline soil subgrade [17].…”

The Effect of Fly Ash Substitution in 3 Brands of PCC Cement on The Compressive Strength f Concrete

“…One of the materials that can be used to mix concrete is coal dregs, which have a high buildup, namely fly ash. Fly ash is industrial waste produced from burning coal and consists of fine particles [2], [4], [6]- [10]. Using coal as an energy source will produce ash, namely fly ash and bottom ash.…”

“…Taking into account the potential for fly ash produced by coal-using power plants in Indonesia, which is more than 1 million tons per year and the difficulties in storing fly ash, it is necessary to research the possibility of using coal ash from PLTU waste for example for industrial purposes [11]- [13]. Cement production generally uses the primary raw materials, namely limestone and clay, which contain silica compounds (SiO2) [1], [6], [10], [12], [14]- [17]. If we look at the composition of the number of compounds, the chemicals in fly ash are silica compounds; this potential can be used as a cement mixture.…”