QAQC in Construction

ROCKFILL: Rockfill will generally be natural materials that are hard, durable, and larger than gravel size. Rock-fill may contain only trace amounts of sand or fine-grained soil materials; however, various amounts of sand and fine-grained materials may be allowed by some specifications. Riprap materials differ from rock-fill in that they are generally clean materials of a specified gradation. Rockfall materials may be from a source on the construction site or from offsite sources. On some occasions, rock-fill materials may be of less durable onsite materials that are more weathered, but are being used as a zoned fill for purposes of economy. These types of materials will breakdown during the processing and compaction, so close attention needs to be given to specified methods and field test results. Borrow sources (onsite or offsite), gradation, quality of rock-fill materials, processing, and compaction need to be clearly designated in the drawings and specifications. With respec...