Gaps in Material Specifications—A Manufacturer's Perspective

摘要: There are numerous areas of materials specifications accepted or not covered regarding current in ASTM, American Concrete Institute (ACI), other recognized standards groups. In the past, made utilizing ASTM C150 portland cement and C33 aggregates were norm. Utilization supplementary cementitious added to potential for quality improvements cost control. Further expansion occurred with use recycled aggregates, re-graded blended conventional aggregates. Newer cements have been researched, produced on a limited basis tested. Some proven be successful commercially. used Ultra High Performance Concretes. The these has hindered by lack inclusion specifications. those cases that had newer developed, acceptance building codes, departments transportation, others their use. Efforts needed develop standard as along efforts gain codes transport bodies. It will describe acceptances gained further needed.