ABSTRACT
This chapter discusses variability in concrete performance due to variation of aggregate from a single source.
Aggregate typically occupies about 75% of the volume or weight of a cubic yard of concrete. Even though it is largely inert, its large proportion ensures that variation in aggregate properties will have significant impact on concrete performance such as strength, water demand for a given slump, and fresh properties, such as cohesiveness, harshness, segregation, bleeding, ease of consolidation, finishability, and pump ability; all of which may not always correlate with slump.
