With the revival of the Olympic Games in the modern era, the pentathlon returned in two formats. The athletics pentathlon was a modern variation on the original events, with a competition over five track and field events.
Aggregate is defined as a complete amount. An example of an aggregate would be the total number of students in all of one grade level. Aggregate means to combine or mix together. An example of aggregate is to mix ingredients for concrete together.
Aggregates typically make up about 60 to 75 percent of the volume of a concrete mixture, and as they are the least expensive of the materials used in concrete, the economic impact is measurable. In addition, the use of aggregates provides volume stability to the hardened concrete. The shrinkage potential of a cement paste is quite high when compared to the aggregates. Controlling shrinkage of the concrete material is important since shrinkage and cracking potential increase together.