crack & honeycomb repair method
DESCRIPTION
Concrete repairsTRANSCRIPT
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Problem Statement Shrinkage crack happened to be appeared on top surface of top deck and bottom deck of the segment. Normally appeared after 7 days age. Crack width is more than 0.2mm
Causing Factor Curing procedure is not doing properly Plastic shrinkage might due to settlement of the concrete at web area.
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SHRINKAGE CRACK
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The affected area is grind to get a clear crack
mapping
All the debris and dust is then cleared by using
vacuum cleaner
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Preparation of epoxy by using Sikadur 31CF Normal
The crack line in then patched with epoxy and at
the same time nozzle is installed for injection
purposes
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All the cracks had been sealed and installed with
nozzle.
The low viscosity injection liquids (Sikadur 52my )is then mix with the right
proportion.
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The mixing of Sikadur 52my is now being injected
in every nozzle provided
After the injection liquid had harden, all the nozzle and rough surface is grind
until smooth
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Finished surface
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Problem Statement Severe honeycomb appeared at the bottom surface of the bottom deck of the segment. Happened at the critical part which is below the anchorage block.
Causing Factor Insufficient vibration applied. Low flow test of concrete was used. (Flow : 550mm)
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HONEYCOMB
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Honeycomb was spotted at the bottom of the
segment
The affected area is hacked until sound concrete
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Sika Top Armatec-110 EpoCem then is applied to the steel as a debonding
agent
Formwork is fixed with inlet and outlet pipe
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Sika Microcrete 2000 is mixed
Sika Microcrete 2000 is poured into the pressure
grout pump
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The grout is pumped inside the affected area through
bottom inlet pipe
Both inlet and outlet pipe had to be sealed after fnish
grouting
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Sample of the grout should be taken to test the
compressive strength
After demould the formwork, all the surface
need to be grind smoothly
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Finished surface