1 the fine, soft, shiny fiber produced by silkworms to form their cocoons. 2  thread or fabric made from this fiber. 3  a garment or other article made of this fabric. 4  a distinctive silk uniform, as of a jockey.  the silk gown worn by a King's (or Queen's) Counsel in British law courts.
A prescriptive specification is one that includes clauses for means and methods of construction and composition of the concrete mix rather than defining performance requirements.he general concept of how a performance-based specification for concrete would work is as follows: There would be a qualification/certification system that establishes the requirements for a quality control management system, qualification of personnel and requirements for concrete production facilities.
This is probably the historical basis for prescriptive specifications and is not necessarily appropriate for the broad requirements and challenges for concrete construction today. This problem is compounded when the specification calls for prescriptive and performance criteria that conflict.or the most part specifications today still have prescriptive provisions such as specifying the types and quantities of the mixture ingredients, limits on cementitious materials, water-cement ratios, aggregate grading, etc.