The slab has been poured!
This week was busy to say the least. We stopped by the block on Monday night on the way to our valentines day dinner and saw that the plumbing pre-lay had been done, the footings had been poured, WPM had been laid and the reo for the slab was in position. We weren’t able to see much as it was dark but we were surprised to see so much progress.
We came back Tuesday morning to have a closer look at the work carried out only to find the concreters on site pouring the slab! They were about half the way through pouring the slab by the time we got there so we didn’t get a chance to check over the footings/WPM/reo job but we were able to see that they had done the re-entrant corners correctly for the parts of the slab that had not yet been poured.
The concrete was being pumped on site – which is good as we were paying for it in the provisional costs.
After watching for a few minutes I went and spoke to the concreter about flooding the slab. I had read in the site classification report that the slab should be kept moist for three days to help cure the concrete and to improve crack control. You never see anyone doing it so I was curious to know what the concreter had to say about it.
He said that in the current weather with it being so hot, if it was his he’d do it, so with both the engineers and the concreter saying do it we made the decision to flood the slab for three days.
We came down later on in the day after the concrete had set, built a good levy around the entire slab and then filled it up with water. Over the three days we kept the water level up to ensure it was continually moist.
We completed the flooding process Friday afternoon and dismantled the levies over the weekend.
There are quite a few hairline cracks throughout the slab but nothing significant. Temperatures were in the high 30s all week. We inspected another slab that was poured the same day as ours and it looks to have suffered in the heat with a significant amount of cracking present. It will be interesting to see how the cracks in our slab go over the next few weeks.
I still have an outstanding query with SPH regarding the WPM – I don’t believe it was laid in accordance with the site classification report or as detailed by the June 2010 BRB newsletter. I don’t think it will be an issue as the way the WPM and waterproofing has been done on our slab is exactly the same as all the other slabs that I have seen. But I’ve raised it for clarification and I hope to hear more soon.
Slab being poured

Slab poured


Zero lot wall footing inspected – done correctly

Levies built and slab flooded

1 day after slab poured. Someone turned the tap off in the afternoon, we still had full coverage so it was ok. We filled it back up again that night.



2 days after slab poured. Someone turned the tap off again in the afternoon and we lost coverage in a few small areas. We caught it in time though and were able to restore coverage quickly. The surface would not have been dry long and the slab itself was still moist.
I didn’t end up taking an end of day photo as I was too busy flooding the slab!


3 days after slab poured. I turned the water off at about 1pm and kept an eye on it all afternoon. I had to turn the tap back on a few times in the afternoon. Once the sunset over the site I called it a day and a job done.




Levies removed and slab cleaned. The levies took about 2 hours to build but more than double that to remove!
