Porosity Analysis and Compressive Strength of Normal Concrete with Synthetic Wood Waste Filler Additives

To improve the quality of normal concrete often used additional materials such as fillers, to reduce the cavities in the concrete (porosity). Fillers can fill pores in concrete due to gaps from aggregates, if the empty space is reduced, the compressive strength value of the concrete will increase because the cavities in the concrete can result in cracks during loading. The filler used is synthetic wood waste from PT Dominic NISI which makes multiboard from cement. Synthetic wood fillers are not reactive with water, because the silica content in this filler comes from cement which has been reactive when making synthetic wood, therefore this filler is only as a filler in concrete. The optimal value of porosity testing was 9.774% with variations in the addition of 15% synthetic wood waste filler, has decreased porosity by 7.914% compared to concrete without synthetic wood waste filler. While the optimal value of compressive strength with the addition of synthetic wood waste filler at 10% variation of 41.594 Mpa, an increase of 27.09% compared to concrete without synthetic wood waste filler.