Sealing and casing on concrete-cement: the products

[Christophe]

Following this discussion: https://www.econologie.com/forums/pompe-a-ch ... t4123.html
who has completely slipped on the subject of concrete waterproofing, I create this subject, just to propose the different possible solutions.

Indeed: it can interest the world to make a concrete rainwater recovery tank (even if this solution is far from being the most economical ...).
I am concerned because I want to seal (with steam and humid air) the upper slab of our thermal buffer made of concrete.

Here is the list of "possible" products:

- Liquid tar to be applied is the cheapest solution and I think the least "chemical" but the tar is made to waterproof the rain from above and not to resist the pressure resistance. Therefore to limit to very low water heights.

- Mineralizer but quite expensive (20 € per liter to make 4 to 5m²) but it is the solution which seems to me the most durable!

- Additive to mix with mortar: Super SikaLite to mix at 2% (5 € for 150kg of mortar)
http://www.sika.fr/construction/document/nt/nt202.pdf

- Two-component hydraulic mortar: SikaTop 122
http://www.sika.fr/construction/document/nt/nt6200.pdf

- Sikalatex
http://www.sika.fr/construction/document/nt/nt900.pdf

[EGTS]

There are actually several solutions for sealing buffer tanks:
- the most economical is certainly the use of SUPER SIKALITE from SIKA, completely respecting the application advice, i.e. a hanging coat then 2 passes of approximately 2 cm thick
- another solution is the use of synthetic resin-based mortar of the SIKATOP 121 type from SIKA also (two-component: a bag and a canister to be mixed homogeneously), the SIKATOP 122 is only used to treat special points of the groove type (all re-entrant angles ... walls / walls, slab / walls, etc. after careful transplanting, making of waterproof rings: bushings)
- liquid mineralization does not offer any durability in my opinion for this type of retention and I advise against the use of crystallization-based products whose performance is linked to the presence of "quicklime" in the concrete, sealing by crystalline reaction .
- as for tar and bitumen products, they are rarely used in retention and far from constituting an ecological and economic ideal