Use of Aggregates Containg Sulphides for Unreinforced Roller Compacted
Use of Aggregates Containg Sulphides for Unreinforced Roller Compacted
(OP)
We are rehabilitating a dam by using unreinforced Roller Compacted Concrete. The problem is that the dam is located
in a very remote area and lacks commerically available aggregate and would be cost prohibitive to bring this material to site.There are local sources of rockfill (rhyolite and granite), however, they contain a limit amount of sulphide mineralisation. Does anybody have any advice on using this as a source of unreinforced concrete aggregate?
in a very remote area and lacks commerically available aggregate and would be cost prohibitive to bring this material to site.There are local sources of rockfill (rhyolite and granite), however, they contain a limit amount of sulphide mineralisation. Does anybody have any advice on using this as a source of unreinforced concrete aggregate?
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RE: Use of Aggregates Containg Sulphides for Unreinforced Roller Compacted
Your country’s design code for concrete should specify limits for chlorides and sulphates.
In Australian practice, aggregates containing sulphides or sulphate salts in proportions which result in sulphate content of the concrete exceeding 5% (by mass of Portland cement) are not to be used.
RE: Use of Aggregates Containg Sulphides for Unreinforced Roller Compacted
I don't know what the limits on the sulphide/sulphate content was, but for years in my area (Birmingham, Al US) Blast Furnace Slag was the aggregate of choice for concrete and all other aggregate use. Like I said I don't have the numbers but both sulphide and sulphate were fairly high in the aggregate.