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

     The increasing demand for concrete would also means that the demand of natural aggregates also increases and it leads to quarrying causing the depletion of our natural resources. But many provinces here in the Philippines do not produce crushed stones but they do have a need for aggregates and these could be replaced with the recycled concrete.

     This study focuses 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 ACUNSCP requirement by using recycled pavement concrete aggregate. The percentages used for the substitution of recycled concrete pavement as coarse aggregate were 30%, 60%, and 80% by weight replacement. There were nine samples for 0%, 30%, 60% and 80% recycled concrete aggregate content, for a total of 36 samples. The three samples were tested on the UTM machine for its compressive strength considering 7th,14th and 28th day of curing periods.

     The compressive strength of each mixture designs at each sample varied differently depending on the percentage replacement of the recycled concrete pavement aggregates. Results of the experiment showed that increasing the recycled aggregate content adversely affects the workability of concrete. On the other hand, the analysis of test results showed that all of the percentage replacements can be a viable option as coarse aggregate for concrete production.