Causes of seepage in post - poured zone and remedial measures

Phenomenon
After pouring sub-base floor, external walls and floor after pouring belt, and through each other, its width is generally 800 ~ 1000mm. After completion, and some in the post-pouring zone on both sides of the junction of water seepage, and some wet stains, a serious leakage of water into a linear.
2. Analysis of the causes
Concrete floor and wall after the pouring belt on both sides of the mouth do not do with the mouth or not installed metal water stop. Although some have installed a metal water stop, but the water stop displacement, the thickness of both sides of the concrete inconsistency.
Steel-intensive, with both sides of the post-casting mold support difficult, barrier method properly, due to leakage of slurry, vibrator is not in place lead to concrete crisp.
After the steel belt with serious corrosion. Bottom slit inside the slag is not completely clean, both sides of the old concrete is not chiseled, laying slurry after pouring concrete.
After the use of compensation with the shrinkage of concrete grades did not improve the amount of micro-expansion agent, concrete slump control, vibration is not meticulous, old and new concrete combination is not strong.
Conservation is not covered in time, less watering, conservation period did not meet the required time to form removal.
3) Treatment measures
After the sides of the casting with wood seal sealing should be to minimize the loss of concrete slurry.
Before pouring the concrete after pouring, must do the following points:
1) drain the stagnant water, clear off the ash, remove the loose stone on both sides until a solid layer, and strive to smooth;
2) has been embedded in the steel waterstops, steel or steel strip should be removed to stop the rust, washed, the compressed air to remove fluid and ash;
3) do not do with the edge of the seam I did not install steel strip with water stop, should be pasted BW rubber seal;
4) After pasting the BW rubber seal on both sides of the post-pouring belt, the old concrete should be wiped with a layer of cement tape and the length of the joint is 30-50 mm. The metal wire should be fastened with cement nails. The horizontal seam of the bottom plate and the cast-in-place slab should be pasted on the upper steel bar adjacent to the surface of the plate, and should be stuck in the wall to the inside of the outer reinforcing bar. Before pouring concrete, should avoid the rain, water immersion sealing strip;
5) After the pouring of concrete to be compensated shrink concrete, the strength grade should be higher than the old concrete 0.5 to 1, with cement content of 14% to 15% of the UEA or WG-HEA expansion agent. Slump control in the 160 ~ 180mm (pumping concrete).
Concrete before and after pouring on both sides of the old concrete surface should be wiped with a layer of concrete than the original coarse aggregate removal. Pouring after pouring concrete, the head shall not touch the seal.
Concrete pouring is completed, the final setting should be immediately before the conservation. The curing time shall not be less than 14 days.
The lower part of the cast-in-place post-pouring belt template shall not be removed prematurely. Must be removed, with both sides of the column and should be kept up and down the alignment layer to prevent degeneration cracks caused by leakage.

Next:Nothing