Excessive Bleed Water 1

[Rich21]

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.

 

[civilperson]

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.

 

[Ron]

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.

 

[mcutchi]

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