Abstract:
Preplaced Aggregate Concrete (PAC) is a concrete produce by placing its aggregates in the mold first then injectedit with grout. One of the variable to a good result of PAC is the quality of grout.This paper was investigate about the effect of coarse aggregate variation to PAC compressive strength. Coarse aggregate used were rounded stone with diameter of 20 mm and 30 mm, and crushed stone with diameter of 30 mm. The researches about PAC had conducted by Abdelgader (1999) and Ganaw (2012) which gave equations to estimated PAC compressive strength. Compressive strength result from this study would compared to the predictions using equation from previous research.The results showed that PAC that uses smaller aggregates had a smaller average of compressive strength. This was shown with the result of the compressive strength of PAC with coarse aggregate of 20 mm diameter of rounded stone was 11.11% smaller than diameter of 30 mm.PAC that used crushed stone as aggregate has a higher average compressive strength than rounded stone aggregate one. It shown from the result of the compressive strength of PAC with crushed stone coarse aggregate had an average compressive strength of 6.79% that was greater than concrete with rounded stone coarse aggregate.The results of compressive strength prediction by using formulas from the previous studies indicated that Ganaw’s formula has the closest result to the test result performed in this study.
