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  #11  
Old 06-17-2011, 02:10 AM
Peasant
 
Join Date: May 2011
Location: Victoria
Posts: 36
Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

good idea with the water reducer. helps keep you water/cement ratio low and the harder your concrete the eisier to get a high polish.
Have you thought reinforcement yet?
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  #12  
Old 06-17-2011, 02:27 AM
crwdtb's Avatar
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Join Date: Feb 2010
Location: australia
Posts: 124
Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

Obviously reo around perimeter with mesh through out, I was going to give poly fibres a miss, I just think it might be a bit of overkill?
Can you use to much reducer? I had about 35ml for a test piece with 5kg portland cement , 16kg aggregate , 15kg sand, 1.2lts water.
obviously I will keep the ratios if it works out ok. it certainly looked good going in the mould. easy to work and no water rising even after hitting it with the vibrating sander on the mould.
Any ideas appreciated
Cheers
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  #13  
Old 06-17-2011, 04:43 AM
Peasant
 
Join Date: May 2011
Location: Victoria
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Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

sounds like a good mix to me. I dont use any fibres also think overkill unless your trying to go really thin. Not sure how much reducer would be too much but if that ratio works (im sure it will) stick with it. Wet cure it for at least few days. grind after 1/2 weeks, polish 2 weeks later or when its taking a polish well.
I dont call myself an expert but done it enough to know it works. good luck!
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  #14  
Old 06-17-2011, 05:16 PM
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Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

thx brickie, by the way I have a wet grinder with grit pads that range from 50 right up to 3000, do I just hit it with that? or first with a grinding wheel?
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  #15  
Old 06-17-2011, 10:21 PM
david s's Avatar
Il Pizzaiolo
 
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Location: Townsville, Nth Queensland,Australia
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Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

crwdth,
you can use too much superplasticiser (water reducer) If you do you get separation, ie. the aggregate sinks to the bottom. It sounds like you used the correct amount if this did not happen. There should be instructions on the product telling you how much to add.
Dave
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  #16  
Old 06-17-2011, 11:52 PM
Peasant
 
Join Date: May 2011
Location: Victoria
Posts: 36
Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

a metal cup wheel first if you want to cut it back and expose all the stone, then your pads
Just the pads if its nice n flat already and you only want minimal exposure
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  #17  
Old 06-17-2011, 11:53 PM
Peasant
 
Join Date: May 2011
Location: Victoria
Posts: 36
Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

be gentle till you get a feel for the grinding. work in circles. avoid gouges
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  #18  
Old 07-22-2011, 12:49 AM
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Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

OK it took me longer than I thought to make template and forms for the benchtop. However I finally got it done made my own cement mix for the first time and uncovered my benchtop today with tap hole and a sloping drain board section on one side. I am pretty happy with how it turned out and will seal it in the coming days. Thanks everyone for you help and input. As usual it was invaluable.
Cheers
Dave
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  #19  
Old 07-22-2011, 01:04 AM
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Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

hopefully a nice clear sealer will bring out the colour a bit more
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  #20  
Old 07-23-2011, 01:33 AM
Peasant
 
Join Date: May 2011
Location: Victoria
Posts: 36
Default Re: where to buy suitable bag mix for concrete benchtop in Melb Aus?

nice one! liiks really nice! sealer should make it look just like it does when wet
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