[Ferro List] more Tom's crud testings

[Jon Sherbeck]

Tom,
I'd say its good that you have eliminated the spring water as a source of 
your problem.  Unfortunately, I don't know what else to suggest.  I hope you 
or somebody does get to the root cause and we all learn from your troubles.

The Basalt fibers, and Type K cement might be an interesting combination, 
along with the usual integral waterproofers like Xypex if one wants to 
eliminate curing cracking and get a watertight product that can last.

Good luck!

Jon

----- Original Message ----- 
From: "tom rapenske" <rapenske at yahoo.com>


> Jon,
>
>  Ya, at Uwe's prompting I checked the spring water back in Nov. All the 
> previous photos I've posted in Nov and Dec were ones that I used distilled 
> water in as a thorough test of the spring water. Please note that in the 
> latest testings the #4 sample used distilled water again as a further 
> test. It seems likely at this point that the spring water is playing no 
> part in the problem.
>
>  Unrelatedly, your past dummy-slap posts re compatible thermal 
> coefficients of different metals and materials in cementitious composites 
> have been super interesting in that subsequent relevant research has, once 
> again, reinforced the crucial task of FCers to pay attention to 
> microcracking in the design and repair of FC structures. Although ignored 
> in recent postings about after-the-fact dome leakages, 
> off-the-back-of-the-truck accidents, and waterproof coatings, 
> microcracking, both inherent and load caused, is often much more important 
> to appropriate impermeability than porosity! Very numerous research 
> papers/ concrete and FC technologists/ PVA literatures, etc have all long 
> pointed out that the mostly invisible (under ~200 microns?) microcracking 
> that is potentially an underlying causation of leakage/ poor durability 
> only gets worse with the passage of time (as opposed to more stable 
> porosity volumes) as various stresses (incompatible thermal coefficiencies 
> being only
> one) occur in our structures. Applying inappropriate waterproof coatings 
> to block porosity can be way too bandaidish to solve real problem. 
> Sometimes all that fundamental info gets swallowed up in engineering 
> gobbledygook language, but the essential fact seems to indeed be that 
> microcracking design is of great importance in the impermeability, 
> durability, strength, and serviceability of most FC. No? Perhaps Richard 
> or TP or you could lend their expertise to my clumsy commentary and 
> provide easy links to fascinating FC/concrete microcracking literature 
> that is understandable to us interested peons doing small potatoes 
> projects?
>
>  Tom
>
> Jon Sherbeck <sherbeck at doitnow.com> wrote:
>  Tom,
> I have been following your investigation, and have to wonder if the common
> denominator to the problem is the spring water. Maybe you should try a 
> test
> with some distilled water. Jon
>
>
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