ANALYSIS OF THE EFFECT OF AGGREGATE GRAIN SIZE ON COMPRESSIVE STRENGTH AND PERMEABILITY OF POROUS CONCRETE
This study was conducted to determine the effect of the grain size of Palu's coarse aggregate on the compressive strength and permeability of porous concrete and the highest compressive strength and permeability values obtained in the porous concrete. This study began with testing the coarse aggregate material, then planning and manufacturing specimens with 3 variations in the size of the Palu coarse aggregate, namely 4.75 mm–9.5 mm (BP1), 9.5 mm–19.0 mm (BP2), and 19.0 mm–37.5 mm (BP3) according to the ACI standard 522R-10. The tests carried out were compressive strength testing and permeability testing with a total of 18 specimens at the age of 28 days. Based on the tests carried out, the highest compressive strength of porous concrete is the BP1 variation with a value of 19.77 MPa, while the highest permeability value is the BP3 variation with a value of 840.89 mm/minute. The grain size of the coarse aggregate in Palu is very influential on the compressive strength and permeability of porous concrete. Aggregates with small grain sizes have high compressive strength values but have low permeability values. Meanwhile, porous concrete that uses aggregates with large grain sizes has a low compressive strength value but has a high permeability value. Large porosity due to using aggregates with large grains produces a large permeability value but has a small compressive strength value and vice versa.
Porous concrete, Coarse Aggregate, Compressive Strength, Permeability, Porosity