Bleeding on concrete
Bleeding on concrete
(OP)
HI
Lean concrete mix poured in a slab, 50 cm thick. Upon casting considerable bleed water appear on the surface (pic attached). The concrete mix tested for fresh properties like slump, air content, bleeding and found to be ok. The slump is about 18 cm and no bleeding observed at all.
But why is bleed water standing on the surface after few hours of casting. No water table beneath and the mix has more than 50% of fine aggregate even though the cement content is less (about 300 Kgs) as it is a lean mix 15 Mega Pascals at 28 days.
Kindly share your views.
Lean concrete mix poured in a slab, 50 cm thick. Upon casting considerable bleed water appear on the surface (pic attached). The concrete mix tested for fresh properties like slump, air content, bleeding and found to be ok. The slump is about 18 cm and no bleeding observed at all.
But why is bleed water standing on the surface after few hours of casting. No water table beneath and the mix has more than 50% of fine aggregate even though the cement content is less (about 300 Kgs) as it is a lean mix 15 Mega Pascals at 28 days.
Kindly share your views.
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RE: Bleeding on concrete
Especially for a "lean" concrete as you state, there is possibly less Portland cement there to receive all the water and, well, it bleeds upwards.
Normal practice is to strike off the concrete and float. Then let the slab stand for a period and let the bleed water rise. Then pull off the water from the surface and finish the final troweling.
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RE: Bleeding on concrete
RE: Bleeding on concrete
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RE: Bleeding on concrete