0‘quv materiallari (ma’ruza matni)

let alone to understanding of the relevant
property.
The new standards have been introduced in this fifth edition of Properties of Concrete for the purpose of informing the reader about the approach to, or principles of, testing. However, given continuing evolution of standards, for specific use, the reader should refer to the text of the actual standards and follow them scrupulously. After all, this book is not intended to be a manual or handbook, let alone a cookbook.
Furthermore, I have not deleted references to earlier publications. I did so for two reasons.
Firstly, this is a new edition of a successful book and not a new book. Secondly, the old references contain the development of our knowledge, much of it basic. On the other hand, many of the recent papers contain minutiae of specific behaviour under specific conditions, and contribute but little to the pool of knowledge capable of generalization.
It may be a reflection of my age but I find that
our pool of knowledge of value to designers, contractors and suppliers is not greatly increased by
a paper co-authored by six people without much
coordination or generalization. Nor are papers describing
the behaviour of concrete incorporating