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We have access to mountains of thinset adhesive for very cheap. We are building a block pumphouse, and wondered if we could add some small pebbles or coarse sand to the thinset adhesive, and use it for mortar between the blocks. We would also use this to fill some of the blocks (with rebar also) for structural support. We have a cement mixer. Does anyone know of a mix ratio to make this work?
 

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1.You do not know what is really in the thinset.

2. The mortar for laying block should not have "pebbles" in it unless you really want a poor, sloppy and crude looking job. It certainly does not meet any possible specifications because of the additives in the thinset. It would also be hard to clean up.

3. You use MASONRY grout that is very wet 8" to 11" slump compared with normal concrete of 4" and with concrete, you would not get it filled into the block very well. Masonry grout, when used with rebar normally cannot have additives and especially not any air entraining additives.

That adds up to one unknown and two improper substitutions. All for a minor cost savings and more work and possibly a poor job.

Obviously, you are are not getting a permit.

Dick
 

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Sounds like a foolish way to save a buck---and risk ruining a project---buy the right stuff----

By the way--setting materials go bad with age and improper storage--if the thinset is not fresh---it is junk.
 
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