Concrete Aggregates. Concrete aggregates, consisting of sand and gravel, represent the grain skeleton of the concrete. All cavities within this skeleton have to be filled with binder paste as complete as possible. Concrete aggregates sum up to approximately 80% of the concrete weight and 70% of the concrete volume. Optimum use of the aggregate size and quality improves the concrete quality.
ASTM A1064/A1064M. (2015) Standard ASTM C330 /C330M. (2014) Standard. concrete free of shrinkage cracks, with a minimum degree of permeability. Standards Body: e. American Society for Testing and Materials. ASTM C330 : Standard Specification for Lightweight. Aggregates for Structural.
Esta norma es esencialmente equivalente a la norma ASTM. 1 Para agregados livianos, ver especificaciones ASTM C330, C331 Y C332; para agregados. Fine aggregate shall be free of injurious amounts of organic impurities. ASTM C330 /331/332 Standard Specification for Lightweight Aggregates for Concrete. ASTM Американское общество по испытанию материалов. оC градус по Цельсию. CARB Калифорнийский совет воздушных ресурсов. C.I.D. Рабочий. Internet Archive BookReader - ASTM C330 : Standard Specification for Lightweight Aggregates for Structural Concrete DOWNLOAD OPTIONS. 1 file.
Aggregates can occur naturally (fluvial or glacial), industrially produced like lightweight aggregates as well as recycled aggregates. For high-quality concrete they are cleaned and graded in industrial facilities by mechanical processes such as crushing, washing, screening and mixing together. Concrete aggregates should have a strong bond with the hardened cement paste, should not interfere with the cement hardening, and should not have negative effect on concrete durability.