Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

 
 
or
Submit
Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 6/6/2014

Is it normal for freshly poured concrete to have cracks?

The concrete was poured in May for my backyard patio. Less than two weeks later I noticed a crack from the corner of the house outward. About a week later I noticed another crack on the step coming out the back door to the patio. There previously was a step & they poured over it & made it a higher & wider step. The crack occurred where the previous step ended. The third crack starts at the outside of the patio & goes inward towards the house.

Do you have the same question? Follow this Question


2 Answers

0
Votes

When I have a concrete job I usually tell a customer to expect cracks. Most often I have no problems but they do happen. If too much water was added to the mix to make it easier to pour they are more likely to happen and sudden temperature changes durring the curing stage can also cause this. The crack over the old step was probably caused by the old cement sucking the water out of the fresh concrete faster than the area poured over soil.

The other cause could be poor compaction of the soil under the slab. If the cracks are small almost like spiderwebs they may close up with time if they are large enough to stick a coin in then you should call the contractor to see what he can do.

You can also read up on this by looking at some of the old answers posted on Angie's List.

Don

Answered 5 years ago by ContractorDon

0
Votes

Yes it is normal. Should it happen - no. Many reason for it to happen, including poor (or no) compaction of the subgrade, no bedding compaction (or reraked to level after compacted), added water to the mix to improve workability or extend working time, overworked the surface, failed to cure the concrete properly (that one is VERY common), poured in excessive heat or too cold of conditions without proper compensation, etc. Improper control joints also commonly causes cracking, as does improper or no reinforcement.


If you give us a couple of photos - closeup and overall (using the Answer This Question button below your question) maybe we can give a better interpretation of the cause for your particular cracks - certainly the one at the preexisting step was likely due to a combination of improper bonding (rebar plus bush hammering to give rough surface), the other could be due to settlement, shrinkage without proper control joints, etc.


A proper concrete job will not crack noticeably in the first few years, though eventually almost all do develop at least some minor cracks. This does not include cracking at the control joints (intentional grooved joints), where it is supposed to accumulate cracking due to shrinkage.

Answered 5 years ago by LCD




Related Questions


Terms Of Use
|
Privacy Policy