0‘quv materiallari (ma’ruza matni)

obsolescent, and also as ‘current, superseded’.
All this is highly confusing but is perhaps an inevitable consequence of a piecemeal introduction of new standards, which do not simply replace the old ones on a one-to-one basis. There is a well-known saying that a camel is a horse designed by a committee. The European standards are designed by an international committee!
I have retained by way of tables and limits information
contained in a number of the old British
standards, even those that have been withdrawn,
because they contribute to knowledge of
what is desirable in the understanding of a relevant
property. I believe that such an approach
is valuable in a scientific book, encyclopaedic in
character. This is especially so because a number
of the new BS EN standards lay down how
to measure some property of concrete and then
to ‘declare’ the outcome but say nothing about
the interpretation of the result. Such an approach
does not contribute to knowledge of what is desirable,