Re-Evaluation Of Viability Of Recycled Pavement Concrete As Fine Aggregate In New Concrete Construction

     Production and utilization of concrete is rapidly increasing in developing countries like the Philippines, which results in increased consumption of natural aggregate as the largest concrete component. This situation leads to a question about the preservation of natural aggregates sources since materials used in concrete are usually mined along with natural gravel from a pit, river, lake or seabed. The practice of recycling construction materials helps in reducing environmental impacts of the construction industry.

     The study focused on the effective percentage replacement and assessment whether or not the samples can achieve a compressive strength of 3000 psi (20.7 Mpa ) as per acl/NSCP requirement by using recycled pavement concrete aggregate. The amount of recycled pavement concrete used was dependent on the computed weight of cement and sand respectively. There were nine samples for 0%, 60%, 80% and 100% RCA for a total of 36 samples. The three samples for each concrete groups were tested on the UTM machine for its compressive strength considering 7th, 15th and 28th days curing period. The compressive strength of each mixture designs at each sample varied differently depending on the percent replacement of the recycled concrete pavement aggregates. Results of the experiment showed that increasing the RCA content adversely affects the workability of concrete. Thus, the analysis if test results showed that the 60% and 80% RCA content groups can be a viable option as fine aggregate for concrete production.