What happens to concrete which is mixed using coarse aggregate composed of a high percentage of limestone dust? We know that limestone dust produces poor concrete but we don't know why.
A publication titled
Stone Sand by J. E. Gray and J. E. Bell, National Crushed Stone Association, Engineering Bulletin No. 13, 1964 discusses the effect of dust on the properties of concrete. Basically, dust affects the bond between the cement and aggregate so that compressive strength can be considerably reduced, and the dust material increases the water requirement of the concrete so that the water-cement ratio is increased, thereby increasing shrinkage and decreasing compressive strength.