additive for concrete waterproofing
additive for concrete waterproofing
(OP)
My concept design for a future parking deck over an existing roof is to use a system of structural steel beams with permanent metal formwork (sold here in South Africa under the brandname Bond-Dek). In this way the columns for the future deck can pierce the roof and the beams and concrete can placed without having to backprop tho the below tennant's space.
The Bond-Dek slab uses the profiled metal sheeting formwork as the bottom flexural reinf and so the slabs are very thin (the min conc could be on 3inches) While the entire slab was to be cast at a slight fall to allow water to drain off, Xypex was to be added to the conc for waterproofing. Does anyone have experience as to what the min dim would be for the Xypex concrete to still be effective
The Bond-Dek slab uses the profiled metal sheeting formwork as the bottom flexural reinf and so the slabs are very thin (the min conc could be on 3inches) While the entire slab was to be cast at a slight fall to allow water to drain off, Xypex was to be added to the conc for waterproofing. Does anyone have experience as to what the min dim would be for the Xypex concrete to still be effective






RE: additive for concrete waterproofing
RE: additive for concrete waterproofing
If you do decide to use Xypex as a "belt and braces" approach in addition to a membrane, you should carefully study the product literature and insist on supplier involvement. It is not just a matter of adding an additive to the concrete. The Xypex specification requires a high percentage of reinforcement, for which the deck will not qualify, and a stringent curing regime, which many contractors will resist.
RE: additive for concrete waterproofing
RE: additive for concrete waterproofing
In the midwest, the main reason for bridge deck to corrode is the application of de-ice (salt) year after year with the help of melting snow and water runoffs. What is the main cause in the SE - humidity, salt in the air? just curious.
RE: additive for concrete waterproofing
Metal deck may be OK for forms only (depending upon the exposure) but you should have a top and bottom layer of reinforcing bars in each direction instead of using the deck as bottom reinforcing steel.
RE: additive for concrete waterproofing
I don't know that I can speak for most bridges in the SE, but I think the predominant cause is leaky deck joints and unmaintained drainage systems. I'm not sure how much the humidity impacts the rate of corrosion, but I'm sure it doesn't help.
The decks of the bridges I mentioned above were regularly cleaned so they probably had more water exposure than typical bridges in the area. The owner claims solvents were not used to clean the decks, but I have my suspicions.
RE: additive for concrete waterproofing
jorton, thanks.
RE: additive for concrete waterproofing
http://www.hycrete.com/
RE: additive for concrete waterproofing
RE: additive for concrete waterproofing
RE: additive for concrete waterproofing