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Excessive Bleed Water

Excessive Bleed Water

Excessive Bleed Water

(OP)
We are having problems with walls we are pouring on a specified job.  The concrete mix is a 4000 psi air entrained mix & is designed with a .35 water/cement ratio.  The concrete is being tested & is being batched at a 3" slump & after verifying & adding plasticizer on site the slump is 8".  After pouring the walls & waiting for the initial set the concrete is producing excessive bleedwater in turn causing the concrete to settle approximately 3/4".  I was curious if anyone has ever heard of this & what may possibley be causing this.

RE: Excessive Bleed Water

Assuming level lifts of less than 2 foot depth, well consolidated/vibrated. then form bowing or lack of uniformity of the mix should be checked.

RE: Excessive Bleed Water

If you have a 0.35 water-cement ratio, then there isn't a whole lot of water for bleeding.  You might be overdosing with plasticizer causing segregation. Check the mix design.  Consider raising the fine aggregate to coarse aggregate ratio.

RE: Excessive Bleed Water

Sometimes over-vibrating causes the mix to lose some entrained air, but the 0.35 ratio may be suspect - check for over-wet aggregates.

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