This paper presents the influence of the use of filler (rock dust) against the normal concrete cement Portland Composite Cement (PCC) brand Holcim, test specimens made cylindrical with size Ø 15 cm height 30 cm. Determination of concrete mixture using ACI Modification method, The planned concrete quality is fc '= 25 MPa. The result of compressive strength is 41,05 Mpa, for concrete mox 15% yield of 37,27 Mpa compressive strength, 25% concrete mix concrete result 33,12 Mpa, while for concrete mix 35% result 31,71 Mpa. There is a considerable difference in the range of results obtained, this is because the gradations are not uniform, abrasion ? 40% and the difference in slump value. Keywords: Compressive strength, Split Tensile Strength, PCC cement.
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