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Concrete production and drought

No change in size, 23:23, 4 June 2012
→‎Construction, operations and maintenance
* Type of water used should be as pure as possible.
* Don’t use weathered rock for concrete aggregate. For the best concrete it is best to use a fresh rock aggregate such as crushedgranite of gneiss or well-washed river gravel. With the latter the river has removed the weak pieces.
* Use clean gravel – impurities will weaken the concrete.
* Use aggregate (gravel) of 5-20mm for non-porous concrete and 5-10mm for porous concrete. Aggregate can be graded using 2 locally-made sieves of 5mm and 20mm – discard any aggregate that remains on the 20mm sieve or that falls through the 5mm sieve.The reasons for having a maximum size is to do with workability, but also that the maximum size is not greater than the “cover” of
concrete over a reinforcing bar – if a stone would span the distance from outer edge to reinforcement, this can become a zone of
weathering where water can get in to corrode the reinforcement.
Winona
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