Ian and James, in collaboration with John Lay (product quality director at CEMEX) have revised Chapter 15, “Concrete Aggregates”. They were joined by Claire Bennett, RSK senior administrator, who assisted with compilation of the revised chapter from the outset.
The chapter explores natural, manufactured and recycled aggregates, and the importance of these ‘binders’ on concrete properties, which has been recognised in concrete composition since the Stone Age. “The usefulness of mixing together stones, sand and some form of binder or cement to form ‘concrete’ has been recognised since Stone Age times,” the chapter begins. “The Romans developed a rather advanced appreciation of concrete technology, including the use of pozzolanas, experimentation with concrete reinforced using bronze bars and the introduction of lightweight and even air-entrained concrete.” As for more recent times, where concrete is the major structural engineering material, “it has become increasingly understood that the properties of aggregates can have an important bearing on the properties and durability of the concrete in which they are used, so that today the requirements for successful aggregates are closely specified and controlled.”
The chapter goes on to examine the types and sources of natural aggregates; quarrying and processing; classification and composition; aggregate properties; and the influence of aggregate on concrete properties. It then explores manufactured aggregates, from lightweight to heavyweight aggregates, and recycled aggregates such as recycled crushed concrete aggregate.
The latest edition was published by Elsevier on 8 March 2019. Ian, James and John’s revised chapter can be found at pp.699–777.
For more information, visit the Elsevier website.