Went into the Lab Today!

[Spud]

the force is irrelevant if they fail before they reach 3mm as that is the propsed standard for crack isolation matting ,we have thought of using a tension scale or even fishing line to test how much force is being applied

 

[Diamond Pool Finishers]

you have to know the the force that each one starts to break surly !!!

 

[Spud]

the test will be how wide the ply gets in mm before they fail 3mm is a pass anything less is a fail ,i was amazed at how much force it took to seperate the tile from the plywood today and when we did eventually get it to release it gave a loud crack when it broke apart it has restored my faith a bit in spf to be honest

 

[widler]

i can honest say i aint got a clue what you all are trying to do, stretch the ply ?:smilewinkgrin:

surely it would be better doing it the other way,pushing (bending)not pulling ?
does the ply not bend/swell when drying causing the delamination ?
to stretch timber like that you will need a hell of a lot more tension than a little workbench with bits of plastic acting as the pulleys:smilewinkgrin:

i may be wrong,i aint no scientist but it just seems pointless,not being bitchy lads

 

[Colour Republic]

i can honest say i aint got a clue what you all are trying to do, stretch the ply ?:smilewinkgrin:

surely it would be better doing it the other way,pushing (bending)not pulling ?
does the ply not bend/swell when drying causing the delamination ?
to stretch timber like that you will need a hell of a lot more tension than a little workbench with bits of plastic acting as the pulleys:smilewinkgrin:

i may be wrong,i aint no scientist but it just seems pointless,not being bitchy lads

The ply is not a single piece, it's 2 peices butted together and a tile bridging the gap. They are trying to see how far the ply can be pulled apart (contraction/expansion) before the tile or addy fails. This is just the first piece, the other pieces have various brands of decouplers (again two peices of ply, bridged by the decupler then a tile on top) to see what the decouplers bring to the party.

 

[widler]

The ply is not a single piece, it's 2 peices butted together and a tile bridging the gap. They are trying to see how far the ply can be pulled apart (contraction/expansion) before the tile or addy fails. This is just the first piece, the other pieces have various brands of decouplers (again two peices of ply, bridged by the decupler then a tile on top) to see what the decouplers bring to the party.

well then thats different then,i must learn to watch it all the way through,instead of skipping :mad2: :lol:

 

[Colour Republic]

well then thats different then,i must learn to watch it all the way through,instead of skipping :mad2: :lol:

Im not sure if its mentioned in this vid or not?

this is part 2 of the test, the first part showed the guys setting the test up and explaining what they are trying to do 😉

 

[Protilers]

[video=youtube_share;nGDp8LOL__g]http://youtu.be/nGDp8LOL__g[/video]

[video=youtube_share;vg-bHiPiUIk]http://youtu.be/vg-bHiPiUIk[/video]

[video=youtube_share;rcrLpr1x6bk]http://youtu.be/rcrLpr1x6bk[/video]

 

[Dan]

Hello all......

I went to the Lab today and met up with Gary (gary the tiler) and Ray (ray tt).............

here is what happened!

[video=youtube_share;rcrLpr1x6bk]http://youtu.be/rcrLpr1x6bk[/video]

all the best.....Happy new year!

Lee

When you test tile adhesive strength, or decoupler strength, the british standard uses a 'tensile test' not just hacking away at it or pulling it apart. A tensile test uses (and measures) force of two joined tiles by way of putting pressure on the adhesive (or decoupler) only.

How you do that is for example get two 6x6 fully vitrified porcelain tiles (so the tile doesn't break first) and fix them together with a 20mm lip on each of them (so they're in effect back to back, with a 20mm lip at the top and bottom) and then use a tensile machine to apply pressure to them vertically.

So then the pressure is added steadily and increased in increments. You'll find the machine measures pressure to the point of it breaking the adhesion, then what pressure it was at when it broke gives the adhesive or decoupler it's rating or whatever.

Watching you guys taking turns hacking away at tiles that have been stuck down for a couple of weeks is entertaining but it's not really measuring the strength of anything. Too many factors are involved when you do it the way you do it.

If you want to do some tests that have value, you should get a tensile machine and some of the other gubbings that get used in actual tests of adhesives and whatnot.

Don't get me wrong I like watching you messing around drilling holes and whatnot but it's just messing around really IMO. You want to get some awesome tests done that carry weight when it comes to quality of products.

 

[Diamond Pool Finishers]

Very well put Dan, i was trying to say the same thing in a garbled way without proper measurements it don't mean any thing (unless two winds on a workmate count !! ) lol i can just see me trying to say to some customer yes it lasted two and three quarter wind's on my mate's workmate in london :smilewinkgrin: