CHARACTERIZATION OF GEOPOLYMER CONCRETE MADE FROM PEJATEN ROOF TILE WASTE AS PRECURSOR.

Siagian, A.; Supriyadi; Suradharmika, I. G. A.; Nugroho, T.; Amal, M. I.; Subari; Sundari, K. N.; Prajoko, B.; Kristyawan, I. P. A.

This research focused on fabricating geopolymers using roof tile waste from the Pejaten area, which has high alumina (Al2O3) and silica (SiO2) content. Binder-to-aggregate ratios of 35:65, 40:60, and 45:55 were tested to examine their effects on structural and mechanical properties. The characterization revealed that the geopolymers had water absorption capacities and compressive strengths of 12.59% and 12.43 MPa, 15.36% and 10.99 MPa, and 18.43% and 6.21 MPa, respectively. Results indicated that increasing the binder ratio raises water absorption capacity but lowers compressive strength. Augite, the main mineral in ferro-sialate type geopolymer, increased from 0% in the precursor to 24% in the binder. Recycling roof tile waste is currently limited and requires optimization. XRD tests confirmed that the Pejaten roof tile waste's high alumina and silica content meets geopolymer precursor requirements. Consequently, geopolymers were made with binder-to-aggregate ratios of 35:65, 40:60, and 45:55. The tests showed that the 35:65 ratio had a water absorption rate of 12.59% and compressive strength of 12.43 MPa; the 40:60 ratio had a water absorption capacity of 15.36% and compressive strength of 10.99 MPa; and the 45:55 ratio had a water absorption capacity of 18.42% and compressive strength of 6.21 MPa. The main mineral in the geopolymer concrete specimens was augite, which grew from 0% in the precursor to 24% in the binder. The findings suggest that higher binder ratios result in higher water absorption capacities and lower compressive strengths.

COMPRESSIVE strength; X-ray diffraction; ABSORPTION; CONCRETE; ALUMINUM oxide

Rasayan Journal of Chemistry, 2024, Vol 17, Issue 4, p1837

0974-1496

Academic Journal

10.31788/RJC.2024.1748968