Shrinkage of Aggregate. Shrinkage of coarse aggregate measured with wire-strain gauge
is listed in Table 1, where the mean value of 5 to 60 particles in each aggregate was used.
The largest one measured approximately -900 x 10-6 in strain. This value is not necessarily
small compared with shrinkage of cement paste which is generally ranging from 3000 to
4000 x 10-6. It was found that non-negligible shrinkage possibly occurred in aggregates. In a
comparison with rock types, sandstone ranged widely in various shrinkage, on the contrary,
limestone hardly shrunk. As shown in Figure 4, it was showed that the relationship between
the aggregate shrinkage and the concrete shrinkage had a remarkably high linear correlation.