LOCAL AGGREGATE MATERIAL SELECTION FOR MAKING HIGH QUALITY CONCRETE

Abstract

Selected materials which were used for high quality concrete production had to be
selected in accordance with quality standard of SNI. This research applied the K-600
concrete quality planning with standard deviation of 50 MPa. Coarse aggregate material
that had been used was from Katunun Mountain in Pelaihari. Local sand materials or
fine aggregates were Barito sand, Anjir sand and Palangka Raya sand. The main
requirement for coarse aggregate, for abrasion is <18%, maximum mud content is 1%.
The main requirement for fine aggregates, mud content maximum is 2% and the
roughness level in the zone gradation of 2. The cement type 1 was used and the additives
was used was superplasticizer. Job mix design were applied water cement factor of 0,31
with slump of 60 – 120 cm. The average test results on concrete samples at age 28 days
reached 542 kg/cm2 (Barito sand), 595 kg/cm2  (Anjir sand), and 531 kg/cm2 (Palangka
Raya sand).Composition of Katunun aggregate and Anjir sand produced the best
concrete quality.