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How to repair cracked concrete driveway?

HiI have some long cracks in my driveway - are these suitable to fix myself and if so what products? Or would I be better paying someone to do the job?

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Decking and Paving

Repairing

Comments

Jewelleryrescue

Well You could simply use cement powder and water into a slurry (extra sand wont fit the fine cracks)

I t will fill the cracks as is but is is possible to recrack at a later dated.

Another way is

Sika 1L High Strength Epoxy Repair Adhesive Concrete Fix Kit

https://www.bunnings.com.au/sika-1l-high-strength-epoxy-repair-adhesive-concrete-fix-kit_p0960347

I/N: 0960347

$60.78

Convenient kit - just mix and apply
Excellent adhesion to almost all substrates
High load capacity
Shrinkage free hardening

Sika Concrete Fix is an easy to mix and use2-componenthigh-strengthstructuralsmooth-paste epoxy adhesive comprised of Sikadur-33 Part A and Sikadur-33 Part B.

Sika Concrete Fix can be used as a structural adhesive for:

- Concrete elements
- Hard natural stone
- Ceramicsfibre cement
- MortarBricksBlocksMasonryrender etc.
- SteelIronAluminium
- Wood
- PolyesterEpoxy

Sika Concrete Fix can be used on concrete to:

- Repair corners and edges
- Fill holes and voids

An other cheaper option is

Earl's 1kg Concremate Expanding Cement

https://www.bunnings.com.au/earl-s-1kg-concremate-expanding-cement_p0960537

I/N: 0960537

$21

Might need sanding level with a stone or brick.

Hello @davedave

Welcome to the Bunnings Workshop community. It's wonderful to have you join usand thanks for sharing your question about filling the cracks on your driveway.

It's great that you've received good advice from @Jewelleryrescue. Just to add to the suggestions madeI recommend using Gripset Betta 1L Concrete Crack Filler. Since the cracks are not very big this filler should sit in nicely between the cracks of the concrete. Please make sure to clean in between the concrete cracks before applying the filler.

Please make sure to wear personal protection such as gloves and goggles when working on your project.

If you have any other questions we can help withplease let us know.

Eric

I have the same cracks. Im thinking of using the Sika High Strength Epoxy as our driveway is used multiple times a day.

Did you use this product and how were the results?

Will it also work where the concrete crack is going down the side of the base like in my photo?

https://www.workshop.bunnings.com.au/discussion/comment/43623#Comment_43623

Welcome to the Bunnings Workshop community @Kevbo. It's fantastic to have you join usand many thanks for your question about epoxy fillers.

Let me tag @davedave so they are alerted to your question.

Sika High Strength Epoxy is an excellent product for high-traffic areas like your driveway due to its durability. Howeverbeing a two-part epoxyit can be tricky to apply and doesn't leave much room for error. You’ll need to work carefully and follow the instructions closely.

For cracks running down the side of the concrete baseit should still work effectivelyas epoxy can bond well to vertical surfaces. Just ensure the crack is properly cleaned and prepped before application to get the best results. Keep in mindthoughthat while epoxy will fill and strengthen the crackit won’t stop future cracking caused by movement in the slab.

If you plan to paint over the area laterthat could be an issue with epoxy as it may not adhere as well as a cement-based filler would. If painting is in your future plansyou might want to consider using the Gripset Betta 1L Concrete Crack Filler.

Please let me know if you have any questions.

Mitchell

https://www.workshop.bunnings.com.au/discussion/comment/83920#Comment_83920

@MitchellMc @EricL my concrete verandah is leaking under as seen in attached pics.
I had sealed it with Marine sealant https://www.bunnings.com.au/selle ys-410g-black-marineflex-sealant-black_p1230182 in August and there was no leak.

But yesterday when it rainedI see it is leaking again.

looks like due to dry period for more than 2 weeks with no rain and hot weathersealant has given up.

By the waywater stands in this area when it rains.

can you please suggest a solution?

I am planning to go with concremate (https://www.bunnings.com.au/earl-s-4kg-concremate-expanding-cement_p0960538?referrer=RetailApp&utm_source=Bunnings&utm_medium=ProductFinder&utm_campaign=SeeReviewsOnline&pid=0960538).

Is it good?

thank you.

https://www.workshop.bunnings.com.au/discussion/comment/107387#Comment_107387

Hello @approachmhn

Thanks for sharing your question about your concrete veranda. I propose digging out all of the old sealant you've placed into the gap and cleaning it as best you can. Once the gap is cleanI suggest using Earl's 1kg Concremate Expanding Cement. Once the cement curesI suggest putting on CPC 1L Shower Plug Sealant on the entire area. This should seal up any possible leaks you might have on the surface of your veranda.

Let me call on our experienced members @Dave-1 and @Nailbag for their recommendations.

If you need further assistanceplease let me know.

Eric

https://www.workshop.bunnings.com.au/discussion/comment/120946#Comment_120946

Thank you @EricL .

Sure. I will do as suggested.

can I apply concremate even if rain is forecasted in 2-3 hours?

Verandah is painted in charcoal colour.

Sois it ok to paint after putting on CPC 1L Shower Plug Sealant ?

Thanks.

https://www.workshop.bunnings.com.au/discussion/comment/129357#Comment_129357

Hi @approachmhn

Thanks for that added information regarding your verandah. Since the surface is covered in paintI suggest sealing only the area where you have put in Earl's expanding concrete. In regards to the application of Concremateif the forecast is rain in 2 to 3 hours it's best to postpone the application until you get some good weather.

If you need further assistanceplease let us know.

Eric

https://www.workshop.bunnings.com.au/discussion/comment/134690#Comment_134690

Good Evening @approachmhn

With the leak area underneath have you traced it back to the sealant? Im just making sure its not coming from somewhere else before you pull up the old sealant. Water has a funny way of traveling sometimes.

Dave

https://www.workshop.bunnings.com.au/discussion/comment/138135#Comment_138135

Thanks @EricL. will do the sealing as suggested.

Good evening @Dave-1,

I did check around before confirming that the leak is from sealant.

i observed leak last augustand then sealed it. There was no leak after that till this November beginning.

It was hot from last 2 weeks with no rain. Might be the sealant is cracking and giving up space for water to seep in.

https://www.workshop.bunnings.com.au/discussion/comment/140458#Comment_140458

Morning @approachmhn

I know that frustration feeling when something that has been fixed appears again. I had that with my patio and underneath I could see water on the walls after it poured. Turned out it was my steps that were allowing most water under.

Then The option that @EricL has suggested is the one id be doing as well. 😕 Pain in the neck but hhopefully it will be able to handle the heat and rain.

Dave

https://www.workshop.bunnings.com.au/discussion/comment/134690#Comment_134690

@EricL can I paint after sealing on the area where concremate is applied?

so that the surface looks sae all along.

thanks

https://www.workshop.bunnings.com.au/discussion/comment/138139#Comment_138139

Hi @approachmhn,

Yesyou can paint over the Concremate. Just ensure that you sand it smooth; otherwiseyou'll be able to see the repaired area through the paint. Remember to wear PPEincluding a face mask.

Mitchell

https://www.workshop.bunnings.com.au/discussion/comment/140460#Comment_140460

Thanks @MitchellMc .

this is what I need to do. Correct me if I am wrong

1) remove the existing sealant and clean the surface

2) put on concremate and allow it to dry for couple of days.

3) sand on concremate to smoother the area.

4) Apply CPC 1L Shower Plug Sealant on top of smoothened concremate area.

5) after couple of dayspaint it.

https://www.workshop.bunnings.com.au/discussion/comment/142153#Comment_142153

Hi @approachmhn,

Sorry. I was confused and thought you were referencing the driveway. The Verandah is an expansion joint designed to move. I wouldn't use Concremate in itand I wouldn't use a Shower Plug either. You should remove any deteriorated filler and go over the area with Sikaflex 11FC, a flexible filler designed for expansion gaps. This will also seal your leak if the joint is where the moisture is coming from.

After the Sikaflex has cured you can paint over the area.

Mitchell

https://www.workshop.bunnings.com.au/discussion/comment/143364#Comment_143364

Thanks @MitchellMc .

Looks easy now. I will try this weekend when rain gives sometime.

last time I used a marine sealant (https://www.bunnings.com.au/selleys-410g-black-marineflex-sealant-black_p1230182) .

It was good in winter and gave up during summer in last few days. Hope this one is fine for hot and cold days.

https://www.workshop.bunnings.com.au/discussion/comment/143364#Comment_143364

Hi @MitchellMc , @EricL

can I Apply CPC 1L Shower Plug Sealant all over the area of my verandah?

verandah is already painted in charcoal colour. Will it not peel affect the paint.

alsowill the sealant can endure hot and cold climate outside.

Thanks

https://www.workshop.bunnings.com.au/discussion/comment/144275#Comment_144275

Hi @approachmhn,

UnfortunatelyCPC Shower Plug Sealant is not suitable for use over painted surfaces. This is because it is a penetrative sealerand paint will stop it from being able to penetrate through the pores of the concrete. Some more information can be found on CPC's website.

The Sikaflex 11FC that @MitchellMc has mentioned above is a flexible sealant that is often used in expansion joints such as yours. It is used in external applications where no protection from weather is provided and a variety of temperaturesso it is perfect for your situation.

Check out How to fill a joint in a concrete slab where I've used Sikaflex 11FC to fill a gap between two concrete slabs in my shed. It is exposed to both high and low temperatures as well as water and there are absolutely no issues so far.

Let me know if you have any further questions.

Jacob

https://www.workshop.bunnings.com.au/discussion/comment/144935#Comment_144935

Thanks for the clarification @JacobZ.

Hi Teamcan you please guide if I can just pour expanding cement dry in these cracks after clean and spray water to harden it would be a good solution rather using the betta

crack filler

https://www.workshop.bunnings.com.au/discussion/comment/59121#Comment_59121

Good morning @ankittvarshney

I would not pour anything expanding cement into that crack. It looks like a very fine crack and I would use the Gripset Betta 1L Concrete Crack Filler if you really want to repair the issue.

Personally I would clean it and then keep an eye on the crack. Adding anything to it will make it stand out more soI am not sure where your crack is but think cleaningrepainting and feathering in the new colour to old colour may be a better way to go. Cracks do tend to expand and shrink with seasons and also rainfall. Unless water is enteringI would take a less intrusive option.

Dave

https://www.workshop.bunnings.com.au/discussion/comment/91932#Comment_91932

Thanks @Dave-1 it’s my concrete driveway. The crack is about to reach the slab on both sides. I have added few more pics if you can guide what is the best as I don’t want to make this a big problem in the future

https://www.workshop.bunnings.com.au/discussion/comment/111996#Comment_111996

Good Morning @ankittvarshney

Concrete slabs develop cracks for various reasons and here are some that I know of (there are probarlly more but its a start)

- Thickness is to thin of the slab.

- No soil compaction before the concrete was poured.

- Water undermining

- Too heavy a weight on the driveway (Mostly unlikely)

- Tree roots

- No reo in concrete

From your photos of the existing crack I do not think its warranted to try anything major. There isnt a lot you can do repair wise to stop it cracking more. You can seal it using the product I mentioned before but it will not hold the concrete together.

You can install expansion joints to allow the concrete to flex itself without further cracking (in a bad situation which you dont have) These are anything form a cut with a conctrete saw across the slab or something wider and then filling the cut with a felxible compound.

I have cracks at least 5 times thicker then yours on my driverwayprobarlly due to treeswater and age. They do not worry me as the concrete is still flathasnt lifted or become uneven anywhere.

So it comes down to how much effort to go through for the crack you have and your concerms. I would say wait and see if there are more responses/ideas on how to go forward. I will tag a few others for some ideas. @Nailbag, @AlanM52 and @Noyade .

Dave

https://www.workshop.bunnings.com.au/discussion/comment/111996#Comment_111996

Hi @ankittvarshney,

Welcome to the Bunnings Workshop communityit is fantastic to have you with us.

It's fantastic to see @Dave-1 has already jumped in with some great advice.

Cracking in wide concrete slabs is pretty much an inevitabilty and it is why control joints are cut into concrete. Control joints are designed to manage where cracks appearbut they can’t stop them entirely. These cracks are a normal part of concrete’s behaviour and don’t necessarily indicate poor quality or structural problems.

I'd simply fill the cracks with Gripset Betta 1L Concrete Crack Filler to carry out an aesthetic repair.

You should monitor the cracking to see if things worsenbut at this pointI wouldn't worry about it. It all looks pretty normal to me.

Let me know if you have any further questions.

Jacob

https://www.workshop.bunnings.com.au/discussion/comment/123491#Comment_123491

CC: @ankittvarshney,

Hi ankittvarshney,

Here is one area of our driveway.

Concrete was poured in 1971 and I can't recall when the cracks started to appear but since then I have ignored all the passing comments 🙂

As @Dave-1 mentioned I would wait and see...

Some people find that really annoying and to provide some relief (fine cracks) In my brickie crate is a tomato squeeze bottle filled with plain cement and a small paint brush. Puff in... brush inbe tidy use minimum amount and then carefully vac both sides. Leave for the weather to settle-in and wherever needed may need a top-up.

Cheers

https://www.workshop.bunnings.com.au/discussion/comment/111996#Comment_111996

Hi @ankittvarshney

I’ve been holding off responding to show a near 60yr experienced concreter the photos. In his opinion there is no long term repair. The cracks have formed essentially from incomplete or improper preparation which could be from a number of factors which @Dave-1 mentioned. The other two are underground water or tree root issues.

As the cracks are substantial the chances of a successful repair is minimal. The choices remaining are temporary cosmetic repairs such as what @JacobZ and @AlanM52 suggested or pull it up and start fresh unfortunately.

Nailbag

https://www.workshop.bunnings.com.au/discussion/comment/131047#Comment_131047

Thanks @AlanM52 . Do you suggest plain cement as above or https://www.bunnings.com.au/earl-s-1kg-concremate-expanding-cement_p0960537. .. . TIA

https://www.workshop.bunnings.com.au/discussion/comment/135684#Comment_135684

Hi @ankittvarshney,

Dingo Grey Cement.jpg

https://www.bunnings.com.au/dingo-grey-cement-3kg_p0760514

Cheers

https://www.workshop.bunnings.com.au/discussion/comment/111996#Comment_111996

@ankittvarshney

I've just started crack repair and using Dap crack filler a type of polysand. Just pour then spray with water. You'd need to order online as Bunnings don't sell it. Otherwise your looking at grinding out the crack and using something like betta crack fillerbut I didn't love this product. It didnt sink in that well to the cracks.

Actually I'm loving Earl's expanding cementin goes in runny and fills all the gaps and has excellent grip. But it's not flexible so will need to see how it holds up. You also may want to diamond cup grind it afterwards to smooth it down. It's quite hard though.

https://www.workshop.bunnings.com.au/discussion/comment/123647#Comment_123647

Hello @Katie6025

Thank you for sharing your knowledge and experience with the community. Let me tag @davedave to make them aware of your recommendation. I've used Earls expanding cement have found it very handy to use. I would recommend using a trowel to slowly flatten the surface.

Eric

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