In the operation of coal-fired power plants in the Philippines, the pulverized coal which is
used as a source of energy and depending on its coal burning furnace, tends to produce
approximately 80% of Coal Fly Ash and 20% of Coal Bottom Ash. Researches and
studies have shown that Coal Bottom Ash can be used as a road base subbase
aggregate, structural fill material (ASTM E1861-97), and as fine aggregates in asphalt
paving and flowable fill. From recent studies done by Gallardo et. al. in De La Salle
University- Manila, Coal Bottom Ash was used as partial substitute to sand for building
materials like Concrete Hollow Blocks complying to the Philippine National Standards.
The casting and testing of 429 specimens of four-inch-thick hollow blocks and variable
mix proportions were considered in the research. However, with the data produced,
design of simplified mix proportions was not yet done and still to be modeled. Using
neural network self-organizing map to classify organized data sets, a simplified approach
to mix proportions was made to meet the mechanical properties needed to comply with
the Philippine National Standards in Concrete Hollow Blocks.