Additive for hydraulic binder useful to prevent the formation of rust-colored stains at the surface of hydraulic compositions
A method for preventing formation of rust-colored stains on the surface of a hydraulic composition includes mixing the hydraulic composition with an additive for hydraulic binder including at least a dialkanolamine including from 2 to 8 carbon atoms, and at least a polyol preferably chosen from a diol, a triol, a tetraol and mixtures thereof. Other uses include a grinding aid for hydraulic binder precursor, and/or improving the compressive strength of a set hydraulic composition.
1. A method for preventing the formation of rust-colored stains at the surface of a hydraulic composition, said method comprising the step consisting of mixing a hydraulic composition or a constituent of a hydraulic composition with an additive for hydraulic binder comprising:
water
diisopropanolamine, and
a polyol,
wherein, in the hydraulic composition, the weight ratio of diisopropanolamine to the hydraulic binder is from 1×10 −4 to 0.0005.
2. The method according to claim 1 , wherein the polyol is chosen from a diol, a triol, a tetraol and mixtures thereof.
3. The method according to claim 2 , wherein the diol is an alkyleneglycol.
4. The method according to claim 1 , wherein the additive for hydraulic binder comprises less than 20% by weight of triisopropanolamine.
5. The method according to claim 1 , wherein the hydraulic composition comprises the additive for hydraulic binder, a hydraulic binder, optionally a supplementary cementitious material and optionally a fluidifying agent.
6. The method according to claim 5 , wherein the hydraulic binder is a cement.
7. The method according to claim 3 , wherein the alkyleneglycol comprises from 1 to 20 carbon atoms.
8. The method according to claim 4 , wherein the additive for hydraulic binder is free from triisopropanolamine.