Simple Mechanical Beneficiation Method of Coarse Fly Ash with High LOI for Making HVFA Mortar
Abstract: This study focusses
on the effect of milling of fly ash obtained from four different sources on the
properties of high volume fly ash (HVFA) mortar. Two fly ash samples with low
loss-on-ignition (LOI) were taken from a coal-fired power plant, while the
other two with high LOIs were obtained from a textile factory and from a paper
mill, respectively. Milling was performed using a rod mill at a certain period
of time. The workability of HVFA mortar with constant water to cementitious
ratio was controlled by adjusting the superplasticizer content. The results show
that the specific gravity of fly ash increases after milling. Utilizing milled
fly ash ends up with significant strength increase of HVFA mortar, especially
those utilizing high LOI fly ash. This shows that milling is an excellent fly
ash beneficiation technique, especially on the one with high LOI value.
Author: Antoni, Satrya V.,
Hardjito
Journal Code: jptsipilgg150009
