How to raise the height of concrete slab?

[Doug4822]

I need to raise the height of my slab underneath an entertaining area to facilitate run off. 20/30mm should do it. 

It's 8x5.5 and bagged mixes of formulated product like sika rapid patch are ideal but will cost an absolute fortune.  I expect a few $k but not 10k. I can use those mixes

 

for ramping the slopes but the main area needs a 30mm raise over a big area.  What mix/additives should I use? Final finish is intended to be stencil crete. Thanks for your help. Doug 

[JacobZ]

Hi @Doug4822,

Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.

I can't say I'm aware of the necessary additives that would make this kind of job possible. 

As you've said, there are specifically developed products such as Sikafloor® Rapid Patch or SikaQuick 2500 (au) Rapid Hardening Repair Mortar, however they are quite pricey.

I imagine the best course of action would be to contact a concrete mixing plant and discuss your options in terms of mixing additives or to speak with a concrete resurfacing company.

Allow me to tag @Dave-1, @Nailbag and @Jewelleryrescue to see if they have any advice they can offer.

Let me know if you have any further questions.

Jacob

[Dave-1]

Afternoon @Doug4822 

I have not used any ramping concrete mixture as yet and when I went through looking at the specs of the sicaflex a bag will live a square metre by 12mm. So maybe it wont cost a huge amount?

I do like @JacobZ 's suggestion about contacting a concrete company as the overall price might be cheaper for a similar product.

Dave

[Nailbag]

Hi @Doug4822 

Again as with @JacobZ and @Dave-1 I don't have a specific solution sorry. 

However one thought would be to contact one of those driveway resurfacing/restoration companies. They specialise in laying a relatively thin layer of a range of durable finishes over old concrete, pebblecrete etc. 

regards Nailbag