how to repair crack on concrete patio slab
Patio is a beautiful and functional addition to the outdoor living space in your home, but they often develop cracks, and patio crack repair is a headache thing to many homeowners.
In order to repair cracks in a concrete patio slab, there are several steps that are necessary.
Measure crack size:
There are two types of cracks in concrete: hairline crack & large crack
Hairline crack is very narrow and likely quite shallow.Large crack is deeper and wider.
Crack size determine the type of repair material you use.
It is better that customer send us crack pictures, so we will let our technical engineer check,
and make a detailed repair solution as per your actual situation.
Choose filling material:
For hairline crack, it is concrete surface disease, suggest use BC type concrete repair material.
For large crack, it is concrete deep disease, suggest use SC type concrete repair material.
Technical details of BC type concrete repair material:
Test items | Unit | Technical requirement | Test result | Individual conclusion | |
Setting time | Initial setting | Min | ≥15 | 25 | Meet requirement |
Final setting | ≤60 | 35 | |||
Compressive strength | 2h | Mpa | ≥20 | 32 | Meet requirement |
1d | ≥30 | 63 | |||
28d | ≥50 | 95 | |||
Pull strength | 28d | Mpa | ≥1.0 | 2.8 | Meet requirement |
Expansion rate | 28d | / | 0.0%-0.1% | 0.02% | Meet requirement |
Technical details of SC type concrete repair material:
Test items | Unit | Technical requirement | Test result | Individual conclusion | |
Setting time | Initial setting | Min | ≥20 | 25 | Meet requirement |
Final setting | ≤60 | 35 | |||
Compressive strength | 4h | Mpa | ≥20 | 33.0 | Meet requirement |
1d | ≥40 | 66.1 | |||
28d | ≥50 | 90.5 | |||
Pulling strength | 28d | Mpa | ≥2.0 | 2.8 | Meet requirement |
Expansion rate | 28d | / | 0.00%-0.1% | 0.01% | Meet requirement |
Concrete patio slab crack repair steps:
Undercut large cracks-Clean the area-Mixing material-Repairing-Curing-Cut expansion joint
-Open to traffic
When repair cracks on concrete pation slab,Kindly note:
1)When wash:Blow with high pressure blower gun,then thoroughly wash with high pressure water gun.Note:It can't have any float ash,must fully wetting, without any water before repair.
2)When stir:Dry mix SC material and 50% grave, add 13-14% clean water to mix 3-5 mins,
until even.Suggest gravel diameter≤30mm continuous gradation,it's best to use
washed gravel.
3)When repair:Use trowel to force the mixture deep into cracks,smooth out the surface. Suggest control operation time within 30 mins.
Choose Huineng, Your patio crack will be solved with less time and cost.
