GEOLOGICAL SOCIETY OF THE PHILIPPINES
Petrography of Philippine Aggregates
Ma. Ines Rosana Balangue-Tarriela, Ph.D.
National Institute of Geological Sciences, College of Science
Aggregates are used in different kinds of construction. One of the basictools to test the suitability of aggregates is petrographyAggregates can affect the strength and durability of the construction in which they are used. One of the basic tools to test the suitability of aggregates is petrography. This paper presents results of a the a series of petrographic characterization of aggregates from various localities around metropolitan Manila. Several rock samples from quarry sites in the Bulacan, Antipolo and San Mateo-Rodriguez were collected.
Petrography showed that aggregates from these areas vary from sedimentary to igneous rocks. Presence of deleterious components which could influence the suitability of the aggregates such as chert, chlorite, clay and carbonates are found in some samples. Microstructures and cracks were also observed. Another concern which should be considered is the heterogeneity in terms of rock types from the outcrops. This gives lesser uncertainty with evaluation of the quality of the aggregate.
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