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RE: Water Retaining Concrete

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Take care, the shrinkage and temperature reinforcement should not be less
than 0,0028 when crack control joints are located at 25ft. according to ACI
350R-89.
Another cause of this crack is when there is not a good curing method,
because a proper curing is essential to control of cracking.

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> De: Chance, Acie P. <acie_chance(--nospam--at)wdi.disney.com>
> A: 'seaint(--nospam--at)seaint.org'
> Asunto: Water Retaining Concrete
> Fecha: miércoles 30 de septiembre de 1998 15:46
> 
> I am designing retaining walls which will form the edges of a lagoon. The
> first two walls we poured have cracks which go completely through the
wall.
> The cracks appear to be shrinkage cracks. The mix design uses 4000 psi
> concrete with flyash, super P and well graded aggregate. The walls are
> between 10 and 20 ft. high and 2 ft. thick. Vertical steel is # 7 @ 12
back
> side and  #5 at 12 water side. Horz. steel is # 5 @ 12 both faces. Crack
> control joints are located at 25 ft. O/C. This follows ACI 350
> recommendations. I am worried about the damage to the rebar from the
> chlorinated water moving through the cracks. We do not intend to
waterproof
> the lagoon but we do need to insure the structural integrity of the wall.
> The existing cracks are from .002" wide to .035" wide and will be
injected
> but I have a lot of wall left to pour. If any one knows of a good
authority
> on cast in place concrete for water retention I would be interested. 
> 
>