New Mortar Turning to Dust!

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Old 11-06-10, 06:02 PM
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New Mortar Turning to Dust!

I've recently remortared some joints in my 100 year old stone basement foundation (from the inside). I don't know what I did wrong but it has been a week and the mortar is kind of dusty! I may have applied it with too much water in the mortar or maybe its because the other side of the wall is not waterproofed??? I mean if I rub my finger on it, dust falls, and if I keep rubbing, it keeps coming off! Is there anything I can do to stop this (some sort of sealant/paint?) or do I have to chip it out and start again?
 
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Old 11-06-10, 06:19 PM
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What kind or mortar did you use?

Portland cement, lime and sand, or lime and sand, or pre-proportion mortar in a bag or mortar/masonry cement? - Think carefully about what you mixed.

Dick
 
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Old 11-06-10, 06:27 PM
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I used a product called Quikrete Mortar Mix. I found the product page here:

QUIKRETEŽ - Mortar Mix
 
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Old 11-06-10, 07:56 PM
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I had this happen last year. I had added a little to much water but it looked fine when I used the screed; a few days later it was apparent that the top was not stable. I could scratch the top off. I'm not an expert, but it sounds like to much water.
As to how much the tensile strength would be reduced due to excess water, I have no way of knowing. Any structural engineers out there?
 
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