No-fines Concrete:

This concrete is obtained by omitting fine aggregate from the mix so that there is an agglomeration of nominally one-size coarse aggregate particles, every surrounded through a coating of cement paste up to about 1.3 mm thick. There exists, therefore, large pores within the body of the concrete, their large size means that no capillary movement of water can take place and consequently the rate of water penetration is low.

The density of no-fines concrete depends primarily on the grading of the aggregate for a given type of the aggregate. Along with one-size aggregate, the density is about 10% lower than when well-graded aggregate of the same specific gravity is used. The common aggregate size is 10 to 20 mm. No-fines concrete compacts very little as compared to ordinary concrete. The compressive strength of no-fines concrete varies generally from 1.4 MPa to 14 MPa.