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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
Another cause of this crack is when there is not a good curing method,
because a proper curing is essential to control of cracking.

> De: Chance, Acie P. <acie_chance(--nospam--at)>
> A: 'seaint(--nospam--at)'
> 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
> 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
> 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
> 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
> but I have a lot of wall left to pour. If any one knows of a good
> on cast in place concrete for water retention I would be interested.