Terms of coarse aggregate to blend the mix of which is shaped kubikal, a plane of rupture of at least two and a rough surface texture, generally in the form of crushed stone, so that granular aggregate have a good interloking in the mix. However, in certain areas of aggregate supply that meets these requirements, sometimes difficult and requires a high cost. Especially in Riau Mainland, crushed stone aggregate shall be imported from Riau Kepuluan (Tanjung Pinang). Meanwhile, the Riau mainland itself has a considerable potential source of material derived from the Kampar River, but it is round and smooth surface texture.
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