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RE: Water Retaining Concrete[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Water Retaining Concrete
- From: "Marco Zavala " <mzavala(--nospam--at)cosapi.com.pe>
- Date: Wed, 30 Sep 1998 16:57:22 -0500
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. ---------- > 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. > >
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