Title: Coarse Aggregate in Concrete as a Field for Needed Research
Author(s): Herbert J. Gilkey
Publication: Journal Proceedings
Appears on pages(s): 363-414
Introduction-Over a period of years several series of tests have been conducted in the concrete laboratory of the University of Colorado, with a view to comparing the strengths of mortars and concretes which were identical except for the absence or presence of coarse aggregate. Without exception the mortars gave higher strengths than the concretes. Usually these were from ten to twenty per cent greater, but the increases were sometimes as much as 50 per cent. In general the difference becomes less as the sizes of the particles, arid the proportions of the coarse aggregate are diminished. The same facts have been noted by others and there are some published statements to this effect.