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Author Topic: Finally starting my build!  (Read 8996 times)

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Offline Tscarborough

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Re: Finally starting my build!
« Reply #120 on: June 24, 2018, 11:59:48 AM »
You add vermiculite/perlite to concrete to make it lighter, but it also reduces the strength by a significant amount.  The purpose of the grog is to prevent cracking, and to reduce the amount of paste needed to make the concrete.  It will increase the strength.

Offline BANTAR1000

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Re: Finally starting my build!
« Reply #121 on: June 24, 2018, 05:46:52 PM »
Well crap... lol now I have to go take out some aggression!

Offline BANTAR1000

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Re: Finally starting my build!
« Reply #122 on: June 27, 2018, 06:57:30 PM »
I think I'm gonna look for one of these!  lol 

Offline BANTAR1000

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Re: Finally starting my build!
« Reply #123 on: June 22, 2019, 05:55:58 PM »
So I'm back to work again!  But I'm not using a hammer, I'm using a big hammer drill to make grog with my fire bricks.  My plan is a 2" wall all the way around the first sailor course up to the top of the first bricks.  Is the mix for this concrete the same as usual just with fire brick rocks instead of regular aggregate?  Also, how can I tell how much grog I'm gonna need?  Yes, the hammer drill is easier than the metal plate and hammer posted before but it still sucks!  LOL  Thanks guys!  -John

Offline Jon in Albany

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Re: Finally starting my build!
« Reply #124 on: June 22, 2019, 09:03:13 PM »
The mix I used was homebrew plus grog.

1 part hydrated lime, 1 part fireclay, 1 part Portland cement, 3 parts sand plus grog.

No idea how much you will need. I had a good sized box full of it it and thought I could have used some more. As the making of the grog continued, the size of the pieces got bigger out of laziness and possibly grog making fatigue.


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Offline BANTAR1000

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Re: Finally starting my build!
« Reply #125 on: June 22, 2019, 11:14:50 PM »
Wow, Jon I had this all wrong.  I thought it was the

3 aggregate, 2 sand, 1 portland mix and I was just going to use firebrick grog instead!

 How big was your box?  I was planning on using 5, 5 gallon buckets full of grog!

Offline Jon in Albany

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Re: Finally starting my build!
« Reply #126 on: June 24, 2019, 12:16:05 AM »
I can't speak to that mix. I followed Tscarbough's lead from when he built and oven for Gene. You can see what he did in this area of the thread.

https://www.pizzamaking.com/forum/index.php?topic=20117.msg201915#msg201915

My oven is 42 inch diameter. I poured a 2 inch thick ring around the walls. I also added a little more to add mass to the dome.

Offline BANTAR1000

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Re: Finally starting my build!
« Reply #127 on: February 15, 2020, 06:56:54 PM »
Again, Iím back at it this time hopefully for good.  Iím still stuck at the refractory concrete for reinforcing the ďSailorĒ walls.  Iíve found an easier way to make the firebrick grog, but I donít know how much to make!

For a 2Ē thick wall all the way around 42 diameter Iím gonna use:
1 part Portland
1 part fireclay
1 part hydrated lime
3 parts sand
2 parts crushed fire brick
How much crushed fire brick will I need to have?  I have one and a half 5 gallon buckets at the moment but plan to spend tomorrow making more.  Thanks for checking on me! 


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