PENGARUH PENAMBAHAN SERBUK KALSIUM KARBONAT TERHADAP SIFAT FISIKA PAVING BLOCK

Abstract

Paving blocks are a building material widely used in ground surface paving projects, particularly in residential areas, sidewalks, and other public facilities. Initial research focused on the use of local limestone powder combined with black sand as a mixture for paving blocks. Preliminary test results showed that this mixture produced compressive strength that tended to decrease. To reduce water absorption, another material with denser and more reactive properties calcium carbonate (CaCO₃) powder was substituted. This study employed an experimental method with three mixture variations: 1pc : 4ps (4ps – 20%), 1pc : 4ps (4ps – 40%), and 1pc : 4ps (4ps – 60%), with 15 compaction cycles using a 16 kg compaction weight, applied in three layers, each layer receiving 5 compaction cycles. Data analysis employed linear regression analyzed using SPSS software. The results of the study indicate that there was no significant effect on compressive strength, but there was a significant effect on the water absorption of the paving blocks. The maximum compressive strength showed a variation of 20% with an average value of 15.229 MPa; therefore, based on SNI 03-0691-1996, these paving blocks are classified as Grade C concrete blocks. The minimum water absorption result was 20%, with an average value of 6.713%; therefore, based on SNI 03-0691-1996, these concrete bricks are classified as Grade C.